Class: Spider::Model::Mappers::DbMapper

Inherits:
Spider::Model::Mapper show all
Includes:
Storage::Db
Defined in:
lib/spiderfw/model/mappers/db_mapper.rb

Instance Attribute Summary

Attributes inherited from Spider::Model::Mapper

#model, #storage, #type

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Spider::Model::Mapper

#after_delete, #after_save, #associate_external, #association_elements, #basic_preprocess, #before_delete, #before_insert, #before_update, #children_for_unit_of_work, #delete, #delete_all!, #delete_element_associations, #determine_save_mode, #expand_request, #find, #find_with_superclass, #get_external, #get_external_element, #insert, #load, #load_element, #load_element!, #map_condition_value, #map_elements, #map_save_value, #mapped?, #merge_object, #no_map, #normalize, #prepare_delete_condition, #prepare_query, #preprocess_condition, #queryset_siblings, #save, #save_all, #save_associations, #save_done, #save_element_associations, #save_extended_models, #save_integrated, #set_pks_condition, #sortable?, #split_condition_polymorphs, #storage_value_to_mapper, #update

Constructor Details

#initialize(model, storage) ⇒ DbMapper

Returns a new instance of DbMapper.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 10

def initialize(model, storage)
    super
    @type = :db
end

Class Method Details

.write? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 15

def self.write? #:nodoc:
    true
end

Instance Method Details

#alter_table(name, schema, attributes, force = nil) ⇒ Object

Returns an alter table structure description

Raises:



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 1184

def alter_table(name, schema, attributes, force=nil) # :nodoc:
    current = @storage.describe_table(name)
    current_fields = current[:columns]
    add_fields = []
    alter_fields = []
    all_fields = []
    unsafe = []
    fields = schema[:columns]
    schema[:fields_order].each do |f|
        field = f.name
        field_hash = {
            :name => field, 
            :type => fields[field][:type], 
            :attributes => fields[field][:attributes]
        }
        all_fields << field_hash
        if (!current_fields[field])
            add_fields << field_hash
        else
            type = fields[field][:type]
            field_attributes = fields[field][:attributes]
            field_attributes ||= {}
            if (!@storage.schema_field_equal?(current_fields[field], fields[field]))
                # Spider.logger.debug("DIFFERENT: #{field}")
                # Spider.logger.debug(current_fields[field])
                # Spider.logger.debug(fields[field])
                unless @storage.safe_schema_conversion?(current_fields[field], fields[field]) || force
                    unsafe << field 
                    next
                end
                alter_fields << field_hash
            end
        end
        
    end
    alter_attributes = {}
    if (current[:primary_keys] != attributes[:primary_keys])
        alter_attributes[:primary_keys] = attributes[:primary_keys]
    end
    if (attributes[:foreign_key_constraints])
        
    end
    alter_attributes[:foreign_key_constraints] = attributes[:foreign_key_constraints]
    @storage.alter_table({
        :table => name,
        :add_fields => add_fields,
        :alter_fields => alter_fields,
        :all_fields => all_fields,
        :attributes => alter_attributes,
        :current => current
    })
    raise SchemaSyncUnsafeConversion.new(unsafe) unless unsafe.empty?
end

#assign_primary_keys(obj) ⇒ Object

Empty hook to set primary keys in the model before insert. Override if needed.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 845

def assign_primary_keys(obj)
    # may be implemented in model through the 'with_mapper' method
end

#base_type(type) ⇒ Object 



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 984

def base_type(type)
    if type <= Spider::DataTypes::PK
        Fixnum
    else
        super
    end
end

#before_save(obj, mode) ⇒ Object

Save (insert and update) #



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 41

def before_save(obj, mode) #:nodoc:
    super
end

#bulk_update(values, condition) ⇒ Object

Updates according to a condition, storing the values, which must passed as a Hash.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 155

def bulk_update(values, condition)
    db_values = {}
    joins = []
    integrated = {}
    condition = preprocess_condition(condition)
    values.each do |key, val|
        element = @model.elements[key]
        if (element.integrated?)
            integrated[element.integrated_from] ||= {}
            integrated[element.integrated_from][key] = val
            next
        end
        next if !mapped?(element)
        next if element.model? && val != nil
        store_key = schema.field(element.name)
        next unless store_key
        if (val.is_a?(Spider::QueryFuncs::Expression))
            joins += prepare_expression(val)
            db_values[store_key] = val
        else
            db_values[store_key] = map_save_value(element.type, val, :update)
        end
    end
    integrated.each do |i_el, i_values|
        next unless condition[i_el.name]
        i_el.mapper.bulk_update(i_values, condition[i_el.name]) # FIXME?
    end
    return if db_values.empty?
    save = {:table => schema.table, :values => db_values}
    condition, c_joins = prepare_condition(condition)
    joins += c_joins
    save[:condition] = condition
    save[:joins] = prepare_joins(joins)
    sql, bind_vars = @storage.sql_update(save)
    return @storage.execute(sql, *bind_vars)
end

#can_join?(element) ⇒ Boolean

Returns true if an element can be loaded joined-in.

Returns:

  • (Boolean) 


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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 310

def can_join?(element)
    return false if element.storage != @storage
    return true
end

#collect_real_keys(element, path = []) ⇒ Object

Returns an array of all keys, “dereferencing” model keys.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 1099

def collect_real_keys(element, path=[]) # :nodoc:
    real_keys = []
    element.type.primary_keys.each do |key|
        if (key.model?)
            real_keys += schema_collect_real_keys(key, path<<element.name)
        else
            real_keys << [key, path<<element.name]
        end
    end
    return real_keys
end

#compute_foreign_key_constraints ⇒ Object 



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 1074

def compute_foreign_key_constraints
    @model.each_element do |element|
        foreign_key_constraints = {}
        next if element.integrated?
        next unless mapped?(element)
        next if element.attributes[:added_reverse] && element.has_single_reverse?
        next unless element.model?
        next if element.multiple?
        next unless element.type.mapper.storage == @storage
        element.type.primary_keys.each do |key|
            column =  self.schema.foreign_key_field(element.name, key.name)
            column_name = column.name
            next if !key.integrated? && !element.type.mapper.schema.column(key.name) # FIXME
            foreign_key_constraints[column_name] = key.integrated? ? \
            element.type.mapper.schema.foreign_key_field(key.integrated_from.name, key.integrated_from_element).name : \
            element.type.mapper.schema.column(key.name).name
        end
        unless foreign_key_constraints.empty?
            name = element.attributes[:db_foreign_key_name] || "FK_#{schema.table.name}_#{element.name}"
            self.schema.set_foreign_key_constraint(name, element.type.mapper.schema.table.name, foreign_key_constraints)
        end
    end
end

#count(condition_or_query) ⇒ Object

Implements the Mapper#count method doing a count SQL query.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 209

def count(condition_or_query)
    if (condition_or_query.is_a?(Query))
        q = condition_or_query.clone
    else
        q = Query.new(condition_or_query, @model.primary_keys) 
    end
    prepare_query(q)
    storage_query = prepare_select(q)
    storage_query[:query_type] = :count
    storage_query.delete(:order)
    storage_query.delete(:limit)
    return @storage.query(storage_query)
end

#create_table(table_name, schema, attributes) ⇒ Object

Returns a create table structure description.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 1167

def create_table(table_name, schema, attributes) # :nodoc:
    fields = schema[:fields_order].uniq.map do |f| 
        details = schema[:columns][f.name]
        {
            :name => f.name,
            :type => details[:type],
            :attributes => details[:attributes]  
        }
    end
    @storage.create_table({
        :table => table_name,
        :fields => fields,
        :attributes => attributes
    })
end

#define_schema(&proc) ⇒ Object

Define schema. Given block will be instance_eval’d before schema auto generation. See also #with_schema.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 947

def define_schema(&proc)
    @schema_define_procs ||= []
    @schema_define_procs << proc
end

#do_delete(condition, force = false) ⇒ Object

:nodoc:



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 63

def do_delete(condition, force=false) #:nodoc:
    #delete = prepare_delete(obj)
    del = {}
    del[:condition], del[:joins] = prepare_condition(condition)
    del[:table] = schema.table
    sql, values =  storage.sql_delete(del, force)
    storage.execute(sql, *values)
end

#do_insert(obj) ⇒ Object

:nodoc:



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 46

def do_insert(obj) #:nodoc:
    if (obj.model.managed? || !obj.primary_keys_set?)
        assign_primary_keys(obj)
    end
    sql, values = prepare_insert(obj)
    if (sql)
        @storage.execute(sql, *values)
    end
end

#do_update(obj) ⇒ Object

:nodoc:



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 56

def do_update(obj) #:nodoc:
    sql, values = prepare_update(obj)
    if (sql)
        storage.execute(sql, *values)
    end
end

#execute_action(action, object, params = {}) ⇒ Object 



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 927

def execute_action(action, object, params={})
    return super unless action == :delete_associations
    el = object.class.elements[params[:element]]
    delete_element_associations(object, el)
end

#fetch(query) ⇒ Object

Implements the Mapper#fetch method.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 224

def fetch(query)
#            Spider.logger.debug("Fetching model #{@model} query:")
#            Spider.logger.debug(query)
    storage_query = prepare_select(query)
    if (storage_query)
        result = @storage.query(storage_query)
        result.total_rows = @storage.total_rows if (query.request.total_rows) 
    end
    return result
end

#find_by_sql(sql, *bind_vars) ⇒ Object

Finds objects by SQL, mapping back the storage result.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 236

def find_by_sql(sql, *bind_vars)
    result = storage.execute(sql, *bind_vars)
    set = QuerySet.new(@model)
    result.each do |row|
        set << map(nil, row, @model)
    end
    set.modified = false
    return set
end

#generate_schema(schema = nil) ⇒ Object

Autogenerates schema. Returns a DbSchema.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 993

def generate_schema(schema=nil)
    had_schema = schema ? true : false
    schema ||= DbSchema.new
    n = @model.name.sub('::Models', '')
    n.sub!(@model.app.name, @model.app.short_prefix) if @model.app.short_prefix
    schema.table ||= @model.attributes[:db_table] || @storage.table_name(n)
    integrated_pks = []
    @model.each_element do |element|
        if element.integrated?
            integrated_pks << [element.integrated_from.name, element.integrated_from_element] if (element.primary_key?)
        end
    end
    @model.each_element do |element|
        next if element.integrated?
        next unless mapped?(element)
        next if had_schema && schema.pass[element.name]
        next if element.attributes[:added_reverse] && element.has_single_reverse?
        if (!element.model?)
            column = schema.columns[element.name]
            storage_type = base_type(element.type)
            db_attributes = column.attributes if column
            if (!db_attributes || db_attributes.empty?)
                db_attributes = storage_column_attributes(storage_type, element.attributes)
                db_attributes.merge(element.attributes[:db]) if (element.attributes[:db]) 
                if (element.attributes[:autoincrement] && !db_attributes[:autoincrement])
                    schema.set_sequence(element.name, @storage.sequence_name("#{schema.table}_#{element.name}"))
                end
            end
            column_type = element.attributes[:db_column_type] || storage_column_type(storage_type, element.attributes)
            unless column
                column_name = element.attributes[:db_column_name] || @storage.column_name(element.name)
                column = Field.new(schema.table, column_name, column_type)
            end
            column.type ||= column_type
            column.attributes = db_attributes                        
            column.primary_key = true if element.primary_key?
            schema.set_column(element.name, column)
        elsif (true) # FIXME: must have condition element.storage == @storage in some of the subcases
            if (!element.multiple? && !element.attributes[:junction] && !element.attributes[:condition]) # 1/n <-> 1
                current_schema = schema.foreign_keys[element.name] || {}
                foreign_key_constraints = {}
                el_mapper = element.type.mapper
                element.type.primary_keys.each do |key|
                    if key.model? # fixme: only works with single primary key model (after the first)
                        curr_key = key
                        curr_key = curr_key.model.primary_keys[0] while curr_key.model? && curr_key.model.primary_keys.length == 1
                        next if curr_key.model
                        key_type = curr_key.type
                        key_attributes = curr_key.attributes
                    else
                        key_type = key.type
                        key_attributes = key.attributes
                    end
                    #key_column = element.mapper.schema.column(key.name)
                    
                    key_attributes = {
                        :length => key_attributes[:length],
                        :precision => key_attributes[:precision]
                    }
                    column = current_schema[key.name]
                    key_storage_type = el_mapper.base_type(key_type)
                    column_type = element.attributes[:db_column_type] || storage_column_type(key_storage_type, key_attributes)
                    unless column
                        column_name = element.attributes[:db_column_name] || @storage.column_name("#{element.name}_#{key.name}")
                        column_attributes = @storage.column_attributes(key_type, key_attributes)
                        column = Field.new(schema.table, column_name, column_type, column_attributes)
                    end
                    column.type ||= column_type
                    column.primary_key = true if (element.primary_key? || integrated_pks.include?([element.name, key.name]))
                    schema.set_foreign_key(element.name, key.name, column)
                end

            end
        end
    end
    @model.sequences.each do |name|
        schema.set_sequence(name, @storage.sequence_name("#{schema.table}_#{name}"))
    end
    return schema
end

#get_deep_join(dotted_element) ⇒ Object

Returns the joins needed for an element down the tree, expressed in dotted notation. Returns a triplet composed of

  • joins

  • final model called

  • final element called



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 714

def get_deep_join(dotted_element)
    #return [[], @model, @model.elements[dotted_element]] unless dotted_element.is_a?(String)
    parts = dotted_element.to_s.split('.').map{ |el| el.to_sym }
    current_model = @model
    joins = []
    el = nil
#            Spider::Logger.debug("GETTING DEEP JOIN TO #{dotted_element} (#{@model})")
    parts.each do |part|
        el = current_model.elements[part]
        raise "Can't find element #{part} in model #{current_model}" unless el
        if (el.integrated?)
            joins << current_model.mapper.get_join(el.integrated_from)
            current_model = el.integrated_from.type
            el = current_model.elements[el.integrated_from_element]
        end
        if (el.model? && can_join?(el))
            joins << current_model.mapper.get_join(el)
            current_model = el.model
        end
    end
    while (el.integrated?)
        joins << current_model.mapper.get_join(el.integrated_from)
#                joins << current_model.integrated_from.mapper.get_join(el.integrated_from_element)
        current_model = el.integrated_from.type
        el = current_model.elements[el.integrated_from_element]
    end
    return [joins, current_model, el]
end

#get_dependencies(task) ⇒ Object

UnitOfWork dependencies.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 855

def get_dependencies(task)
    deps = []
    obj = task.object
    action = task.action
    deps = []
    case action
    when :keys
        deps << [task, MapperTask.new(obj, :save)] unless obj.primary_keys_set? || (!obj.mapper || !obj.mapper.class.write?)
    when :save
        @model.primary_keys.each do |key|
            if key.integrated? && !obj.element_has_value?(key)
                obj.get(key.integrated_from) # ensure super object is instantiated, so it gets processed later
            end
        end
        
        elements = @model.elements.select{ |n, el| !el.integrated? && el.model? && obj.element_has_value?(el) && obj.element_modified?(el)}
        
        elements.each do |name, element|
            if have_references?(element)
                el_obj = obj.send(element.name)
                sub_task = MapperTask.new(el_obj, :keys)
                deps << [task, sub_task]
            else
                if element.type.mapper && element.type.mapper.class.write?
                    el_val = obj.send(element.name)
                    if element.multiple?
                        set = el_val
                        if element.junction? && !element.attributes[:keep_junction]
                            set = obj.send("#{element.name}_junction")
                        end
                        delete_ass = nil
                        if set.modified # queryset modified
                            delete_ass = MapperTask.new(obj, :delete_associations, :element => element.name)
                            deps << [task, delete_ass]
                        end
                        prev_task = nil
                        set.each do |set_obj|
                            sub_task = MapperTask.new(set_obj, :save)
                            if set_obj.class.attributes[:sub_model] && delete_ass
                                set_obj.class.primary_keys.each{ |pk| set_obj.set(pk, nil) }
                            end
                            if prev_task
                                deps << [sub_task, prev_task]
                            else
                                deps << [sub_task, task]
                            end
                            if delete_ass
                                del_dep = set_obj
                                if element.reverse
                                    set_obj.set_modified(element.reverse)
                                    el = set_obj.class.elements[element.reverse]
                                    # ensure the real owner is added as a dependency
                                    while el.integrated?
                                        del_dep = set_obj.get(el.integrated_from)
                                        el = del_dep.class.elements[el.integrated_from_element]
                                    end
                                end
                                deps << [MapperTask.new(del_dep, :save), delete_ass]
                            end
                            prev_task = sub_task
                        end
                    else
                        el_val.set_modified(element.reverse)
                        deps << [task, MapperTask.new(el_val, :save)]
                    end
                end
            end
        end
    end
    return deps
end

#get_join(element, join_type = :inner) ⇒ Object

Figures out a join for element. Returns join hash description, i.e. :

join = {
  :type => :inner|:outer|...,
  :from => 'table1',
  :to => 'table2',
  :keys => hash of key pairs,
  :condition => join condition
}



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 643

def get_join(element, join_type = :inner)
    return unless element.model?
    #Spider::Logger.debug("Getting join for model #{@model} to element #{element}")
    #Spider::Logger.debug(@model.primary_keys.map{|k| k.name})
    element_table = element.mapper.schema.table
    if (schema.has_foreign_fields?(element.name))
        #Spider::Logger.debug("JOIN A from #{@model} to #{element.name}")
        keys = {}
        element.model.primary_keys.each do |key|
            if (key.integrated?)
                # FIXME
                raise "Unimplemented join dereference for multiple primary keys" if key.integrated_from.model.primary_keys.length > 1
                el_field = element.mapper.schema.foreign_key_field(key.integrated_from.name, key.integrated_from.model.primary_keys[0].name)
            else
                el_field = element.mapper.schema.field(key.name)
            end

            fk = schema.foreign_key_field(element.name, key.name)
            keys[fk] = el_field
            # FIXME: works with models as primary keys through a hack in the field method of db_schema,
            # assuming the model has only one key. the correct way would be to get another join
        end
        if (element.condition)
            condition, condition_joins, condition_remaining = element.mapper.prepare_condition(element.condition)
        end
        as = nil
        if (element.model == @model)
            as = "#{schema.table}_#{element.name}"
        end
        join = {
            :type => join_type,
            :from => schema.table,
            :to => element.mapper.schema.table,
            :keys => keys,
            :condition => condition,
            :as => as
        }
    elsif (element.has_single_reverse? && element.mapper.schema.has_foreign_fields?(element.reverse)) # n/1 <-> n
        #Spider::Logger.debug("JOIN B from #{@model} to #{element.name}")
        keys = {}
        @model.primary_keys.each do |key|
            our_field = nil
            if (key.integrated?)
                our_field = schema.foreign_key_field(key.integrated_from.name, key.integrated_from_element)
            else
                our_field = schema.field(key.name)
            end
            keys[our_field] = element.mapper.schema.foreign_key_field(element.reverse, key.name)
        end
        if (element.condition)
            condition, condition_joins, condition_remaining = element.mapper.prepare_condition(element.condition)
        end
        join = {
            :type => join_type,
            :from => schema.table,
            :to => element.mapper.schema.table,
            :keys => keys,
            :condition => condition
        }
    else # n <-> n
        # no need to handle n <-> n
    end
    # FIXME: add element conditions!
    return join
end

#get_join_info(model, condition) ⇒ Object 



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 498

def get_join_info(model, condition)
    join_info = {}
    condition.each_with_comparison do |k, v, comp|
        next unless k.respond_to?(:to_sym)
        element = model.elements[k.to_sym]
        next unless element
        next unless model.mapper.mapped?(element)
        next unless element.model?
        join_info[k.to_s] = true if !v.nil? || (comp != '=' && comp != 'like' && comp != 'ilike')
        if v.is_a?(Spider::Model::Condition)
            el_join_info = get_join_info(element.model, v) 
            el_join_info.each do |jk, jv|
                join_info["#{k}.#{jk}"] = jv
            end
        end
    end
    condition.subconditions.each do |sub_cond|
        sub_join_info = get_join_info(model, sub_cond)
        if condition.conjunction == :or
            join_info.each_key do |k|
                join_info.delete(k) unless sub_join_info[k]
            end
        else
            join_info.merge!(sub_join_info)
        end
    end
    join_info
end

#get_schema ⇒ Object

Returns the schema, as defined or autogenerated.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 959

def get_schema
    schema = @model.superclass.mapper.get_schema() if (@model.attributes[:inherit_storage])
    if @schema_define_procs
        schema =  DbSchema.new
        @schema_define_procs.each do |schema_proc|
            schema.instance_eval(&schema_proc)
        end
    end
    schema = generate_schema(schema)
    if @schema_procs
        @schema_procs.each do |schema_proc|
            schema.instance_eval(&schema_proc)
        end
    end
    return schema
end

#have_references?(element) ⇒ Boolean

Checks if the schema has some key to reach element.

Returns:

  • (Boolean) 


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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 24

def have_references?(element) #:nodoc:
    element = @model.elements[element] unless element.is_a?(Element)
    schema.has_foreign_fields?(element.name) || schema.field(element.name)
end

#lock(obj = nil, mode = :exclusive) ⇒ Object

Lock db – FIXME



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 195

def lock(obj=nil, mode=:exclusive) #:nodoc:
    return storage.lock(@schema.table) unless obj
end

#map(request, result, obj_or_model) ⇒ Object

Implements the Mapper#map method. Converts a DB result row to an object.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 248

def map(request, result, obj_or_model)
    if (!request || request == true)
        request = Request.new
        @model.elements_array.each{ |el| request.request(el.name) }
    end
    model = obj_or_model.is_a?(Class) ? obj_or_model : obj_or_model.model
    data = {}
    request.keys.each do |element_name|
        element = @model.elements[element_name]
        result_value = nil
        next if !element || element.integrated? || !have_references?(element)
        if (element.model? && schema.has_foreign_fields?(element.name))
            pks = {}
            keys_set = true
            element.model.primary_keys.each do |key| 
                key_val = result[schema.foreign_key_field(element_name, key.name).name]
                keys_set = false unless key_val
                pks[key.name] = map_back_value(key.type, key_val)
            end
#                    begin
            data[element_name] = keys_set ? Spider::Model.get(element.model, pks, true) : nil
#                    rescue IdentityMapperException
                # null keys, nothing to set
#                    end
        elsif !element.model?
            data[element_name] = map_back_value(element.type, result[schema.field(element_name).name])
        end
    end
    begin
        obj = Spider::Model.get(model, data, true)
    rescue IdentityMapperException => exc
        # This should not happen
        Spider::Logger.warn("Row in DB without primary keys for model #{model}; won't be mapped:")
        Spider::Logger.warn(data)
        return nil
    end
    data.keys.each{ |el| obj.element_loaded(el) }
    if (request.polymorphs)
        request.polymorphs.each do |model, polym_request|
            polym_result = {}
            polym_request.keys.each do |element_name|
                field = model.mapper.schema.field(element_name).name
                res_field = "#{model.mapper.schema.table}_#{field}"
                polym_result[field] = result[res_field] if result[res_field]
            end
            if (!polym_result.empty?)
                polym_obj = model.new
                polym_obj = polym_obj.mapper.map(polym_request, polym_result, polym_obj)
                polym_obj.set_loaded_value(model.extended_models[@model], obj)
                obj = polym_obj
                break
            end
        end                    
    end
    return obj
end

#map_back_value(type, value) ⇒ Object 



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 830

def map_back_value(type, value)
    case type.name
    when 'Spider::DataTypes::Bool'
        return value if value.nil?
        return value == 1 ? true : false
    end
    return super
end

#map_type(type) ⇒ Object

Returns a type accepted by the storage for type.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 806

def map_type(type)
    st = type
    return Fixnum if st <= Spider::DataTypes::PK
    while (st && !storage.class.base_types.include?(st))
        st = Model.simplify_type(st)
    end
    return type unless st
    return st
end

#map_value(type, value, mode = nil) ⇒ Object

Converts a value in one accepted by the storage.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 817

def map_value(type, value, mode=nil)
    return value if value.nil?
    
    case type.name
    when 'Spider::DataTypes::Bool'
        value = value ? 1 : 0
    else
        value = super
    end
    
    return value
end

#max(element, condition = nil) ⇒ Object

Aggregates #



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 1242

def max(element, condition=nil)
    element = @model.elements[element] if element.is_a?(Symbol)
    schema = element.integrated? ? @model.elements[element.integrated_from.name].model.mapper.schema : self.schema
    max = {}
    max[:condition], joins = prepare_condition(condition) if condition
    max[:tables] = [schema.table]
    max[:field] = schema.field(element.name)
    joins ||= []
    max[:joins] = prepare_joins(joins)
    sql, values = storage.sql_max(max)
    res = storage.execute(sql, *values)
    return res[0] && res[0]['M'] ? res[0]['M'] : 0
end

#pk ⇒ Object 



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 19

def pk
    [Fixnum, {:autoincrement => true}]
end

#prepare_condition(condition, options = {}) ⇒ Object

Generates a storage description for the condition Returns a list of three elements, composed of

  • conditions: an hash 

    {
  :conj => 'and'|'or',
  :values => an array of [field, comparison, value] triplets
}

  • joins: an array of structures as returned by #get_join

  • remaining_condition: part of the condition which can’t be passed to the storage

– TODO: better name for :values



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 485

def prepare_condition(condition, options={})
    model = condition.polymorph ? condition.polymorph : @model
    model_schema = model.mapper.schema
    cond = {}

    bind_values = []
    joins = options[:joins] || []
    remaining_condition = Condition.new # TODO: implement
    cond[:conj] = condition.conjunction.to_s
    cond[:values] = []
    

    
    def get_join_info(model, condition)
        join_info = {}
        condition.each_with_comparison do |k, v, comp|
            next unless k.respond_to?(:to_sym)
            element = model.elements[k.to_sym]
            next unless element
            next unless model.mapper.mapped?(element)
            next unless element.model?
            join_info[k.to_s] = true if !v.nil? || (comp != '=' && comp != 'like' && comp != 'ilike')
            if v.is_a?(Spider::Model::Condition)
                el_join_info = get_join_info(element.model, v) 
                el_join_info.each do |jk, jv|
                    join_info["#{k}.#{jk}"] = jv
                end
            end
        end
        condition.subconditions.each do |sub_cond|
            sub_join_info = get_join_info(model, sub_cond)
            if condition.conjunction == :or
                join_info.each_key do |k|
                    join_info.delete(k) unless sub_join_info[k]
                end
            else
                join_info.merge!(sub_join_info)
            end
        end
        join_info
    end
    
    join_info = options[:join_info]
    join_info ||= get_join_info(@model, condition)

                
    condition.each_with_comparison do |k, v, comp|
        if k.is_a?(QueryFuncs::Function)
            field = prepare_queryfunc(k)
            cond[:values] << [field, comp, v]
            joins += field.joins
            next
        end
        element = model.elements[k.to_sym]
        next unless model.mapper.mapped?(element)
        if (element.model?)
            el_join_info = {}
            join_info.each do |jk, jv|
                if jk.index(k.to_s+'.') == 0
                    el_join_info[jk[k.to_s.length..-1]] = jv
                end
            end
            if (v && model.mapper.have_references?(element.name) && v.select{ |key, value| 
                !element.model.elements[key] || !element.model.elements[key].primary_key? }.empty?)
                # 1/n <-> 1 with only primary keys
                element_cond = {:conj => 'AND', :values => []}
                v.each_with_comparison do |el_k, el_v, el_comp|
                    field = model_schema.qualified_foreign_key_field(element.name, el_k)
                    el_comp ||= '='
                    op = el_comp
                    field_cond = [field, op,  map_condition_value(element.model.elements[el_k.to_sym].type, el_v)]
                    element_cond[:values] << field_cond
                end
                cond[:values] << element_cond
            else
                if (element.storage == model.mapper.storage)
                    join_type = join_info[element.name.to_s] ? :inner : :left
                    sub_join = model.mapper.get_join(element, join_type)
                    # FIXME! cleanup, and apply the check to joins acquired in other places, too (maybe pass the current joins to get_join)
                    existent = joins.select{ |j| j[:to] == sub_join[:to] }
                    j_cnt = nil
                    had_join = false
                    existent.each do |j|
                        if sub_join[:to] == j[:to] && sub_join[:keys] == j[:keys] && sub_join[:conditions] == j[:conditions]
                            j[:type] = :left if sub_join[:type] == :left
                            sub_join = j
                            had_join = true
                            break
                        else
                            j_cnt ||= 0; j_cnt += 1
                        end
                    end
                    sub_join[:as] = "#{sub_join[:to]}#{j_cnt}" if j_cnt
                    joins << sub_join unless had_join
                    
                    if v.nil? && comp == '='
                        el_model_schema = model_schema
                        element_cond = {:conj => 'AND', :values => []}
                            if model.mapper.have_references?(element.name)
                            el_name = element.name
                            el_model = element.model
                        else
                            el_model = element.type
                            el_model_schema = element.model.mapper.schema 
                            el_name = element.attributes[:junction_their_element]
                        end
                        el_model.primary_keys.each do |k|
                            field = el_model_schema.qualified_foreign_key_field(el_name, k.name)
                            field_cond = [field, comp,  map_condition_value(element.model.elements[k.name].type, nil)]
                            element_cond[:values] << field_cond
                        end
                        cond[:values] << element_cond
                    elsif v
                        v = element.model.mapper.preprocess_condition(v)                          
                        sub_condition, sub_joins = element.mapper.prepare_condition(v, :table => sub_join[:as], :joins => joins, :join_info => el_join_info)
                        sub_condition[:table] = sub_join[:as] if sub_join[:as]
                        joins = sub_joins
                        cond[:values] << sub_condition
                    end
                    
                else
                   remaining_condition ||= Condition.new
                   remaining_condition.set(k, comp, v)
                end
            end
        elsif(model_schema.field(element.name))
            field = model_schema.qualified_field(element.name, options[:table])
            op = comp ? comp : '='
            if (v.is_a?(Spider::QueryFuncs::Expression))
                v_joins = prepare_expression(v)
                joins += v_joins
                cond[:values] << [field, op, v]
            else
                cond[:values] << [field, op, map_condition_value(model.elements[k.to_sym].type, v)]
            end
        end
        
    end
    sub_sqls = []
    sub_bind_values = []
    condition.subconditions.each do |sub|
        sub_res = self.prepare_condition(sub, :joins => joins, :join_info => join_info)
        cond[:values] << sub_res[0]
        joins = sub_res[1]
        remaining_condition += sub_res[2]
    end
    return [cond, joins, remaining_condition]
end

#prepare_expression(expr) ⇒ Object

Takes a Spider::QueryFuncs::Expression, and associates the fields to the corresponding elements Returns an array of needed joins



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 757

def prepare_expression(expr)
    joins = []
    expr.each_element do |v_el|
        v_joins, j_model, j_el = get_deep_join(v_el)
        db_field = j_model.mapper.schema.qualified_field(j_el.name)
        joins += v_joins
        expr[v_el] = db_field
    end
    return joins
end

#prepare_insert(obj) ⇒ Object

Insert preprocessing



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 132

def prepare_insert(obj) #:nodoc:
    save = prepare_save(obj, :insert)
    return nil unless save[:values].length > 0
    save[:table] = @schema.table
    return @storage.sql_insert(save)
end

#prepare_joins(joins) ⇒ Object

– FIXME: document



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 437

def prepare_joins(joins) # :nodoc:
    h = {}
    left_joins = []
    joins.each do |join|
        h[join[:from]] ||= {}
        cur = (h[join[:from]][join[:to]] ||= [])
        has_join = false
        cur.each do |cur_join|
            if (cur_join[:keys] == join[:keys] && cur_join[:conditions] == join[:conditions])
                cur_join[:type] = :left if join[:type] == :left
                has_join = true
                break
            end
        end
        left_joins << join if join[:type] == :left
        h[join[:from]][join[:to]] << join unless has_join
    end
    while left_joins.length > 0
        new_left_joins = []
        left_joins.each do |lj|
            if h[lj[:to]]
                h[lj[:to]].each_key do |to|
                    h[lj[:to]][to].each do |j|
                        unless j[:type] == :left
                            new_left_joins << j
                            j[:type] = :left
                        end
                    end
                end
            end
        end
        left_joins = new_left_joins
    end
    return h
end

#prepare_order(query) ⇒ Object

Returns a pair composed of

  • fields, an array of [field, direction] couples; and

  • joins, joins needed for the order, if any



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 771

def prepare_order(query)
    joins = []
    fields = []
    query.order.each do |order|
        order_element, direction = order
        el_model = @model
        if (order_element.is_a?(QueryFuncs::Function))
            field = prepare_queryfunc(order_element)
            joins += field.joins
            fields << [field, direction]
        else
            el_joins, el_model, el = get_deep_join(order_element)
            if (el.model?)
                # FIXME: integrated elements
                if el.model.storage != storage
                    el.model.primary_keys.each do |pk|
                        fields << [el_model.mapper.schema.foreign_key_field(el.name, pk.name), direction]
                    end
                else
                    el.model.primary_keys.each do |pk|
                        fields << [el.model.mapper.schema.field(pk.name), direction]
                    end
                end
            else
                raise "Order on unmapped element #{el_model.name}.#{el.name}" unless el_model.mapper.mapped?(el)
                field = el_model.mapper.schema.field(el.name)
                fields << [field, direction]
            end
            joins += el_joins
        end
    end
    return [fields, joins]
end

#prepare_query_request(request, obj = nil) ⇒ Object

:nodoc:



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 305

def prepare_query_request(request, obj=nil) #:nodoc:
    super(request, obj)
end

#prepare_queryfunc(func) ⇒ Object 



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 743

def prepare_queryfunc(func)
    joins = []
    func_elements = func.inner_elements
    func_elements.each do |el_name, owner_func|
        el_joins, el_model, el = get_deep_join(el_name)
        joins += el_joins
        owner_func.mapper_fields ||= {}
        owner_func.mapper_fields[el.name] = el_model.mapper.schema.field(el.name)
    end
    return FieldFunction.new(storage.function(func), schema.table, joins)
end

#prepare_save(obj, save_mode) ⇒ Object

Save preprocessing



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 87

def prepare_save(obj, save_mode) #:nodoc:
    values = {}
    obj.no_autoload do
        @model.each_element do |element|
            next if !mapped?(element) || element.integrated?
            next if save_mode == :update && !obj.element_modified?(element)
            if (save_mode == :insert)
                if element.attributes[:autoincrement] && !schema.attributes(element.name)[:autoincrement]
                    obj.set(element.name, @storage.sequence_next(schema.sequence(element.name)))
                end
            end
            if (!element.multiple?)
                next if (save_mode == :update && element.primary_key?)
                next if (element.model? && !schema.has_foreign_fields?(element.name))
                element_val = obj.get(element)
                # next if (element.model? && (!(element_val = obj.get(element)) || !))
                next if (element.integrated?)
                element_val = nil if element.model? && element_val.is_a?(BaseModel) && !element_val.primary_keys_set?
                if (element.model?)
                    element.model.primary_keys.each do |key|
                        # FIXME! only works with one primary key
                        if (key.model?)
                            key_type = key.model.primary_keys[0].type
                            key_value = element_val ? element_val.get(key.name).get(key.model.primary_keys[0]) : nil
                        else
                            key_type = key.model? ? key.model.primary_keys[0].type : key.type
                            key_value = element_val ? element_val.get(key.name) : nil
                        end
                        store_key = schema.foreign_key_field(element.name, key.name)
                        next if store_key.is_a?(FieldExpression)
                        values[store_key] = map_save_value(key_type, key_value, save_mode)
                    end
                else
                    store_key = schema.field(element.name)
                    values[store_key] = map_save_value(element.type, element_val, save_mode)
                end
            end
        end
    end
    return {
        :values => values
    }
end

#prepare_select(query) ⇒ Object

Generates a select hash description based on the query.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 316

def prepare_select(query) #:nodoc:
    condition, joins = prepare_condition(query.condition)
    elements = query.request.keys.select{ |k| mapped?(k) }
    keys = []
    primary_keys = []
    types = {}
    if (query.limit && query.order.empty? && !query.only_one?)
        @model.primary_keys.each do |key|
            elements << key.name unless elements.include?(key.name)
            query.order_by(key.name, :asc)
        end
    end
    order, order_joins = prepare_order(query)
    cnt = 0
    order_joins.each do |oj|
        oj[:as] ||= "ORD#{cnt+=1}" if joins.select{ |j| j[:to] == oj[:to] }.length > 0
    end
    joins += order_joins if order_joins
    seen_fields = {}
    model_pks = []
    @model.primary_keys.each do |pk|
        if (pk.integrated?)
            model_pks << pk.integrated_from.name
        else
            model_pks << pk.name
        end
    end
    elements.each do |el|
        element = @model.elements[el.to_sym]
        next if !element || !element.type || element.integrated?
        if !element.model?
            field = schema.field(el)
            primary_keys << field if model_pks.include?(el)
            unless seen_fields[field.name]
                keys << field
                seen_fields[field.name] = true
            end
        elsif !element.attributes[:junction]
            if schema.has_foreign_fields?(el)
                element.model.primary_keys.each do |key|
                    field = schema.foreign_key_field(el, key.name)
                    raise "Can't find a foreign key field for key #{key.name} of element #{el} of model #{@model}" unless field
                    primary_keys << field if model_pks.include?(el)
                    unless seen_fields[field.name]
                        keys << field
                        seen_fields[field.name] = true
                    end
                end
            end
            sub_request = query.request[element.name]
            # if (can_join?(element) && sub_request.is_a?(Request) && 
            #     sub_request.select{|k, v| !element.model.elements[k].primary_key?}.length > 0)
            #     sub_request = element.mapper.prepare_query_request(sub_request).reject{ |name, req| element.reverse == name }
            #     sub_select = element.mapper.prepare_select(Query.new(nil, sub_request))
            #     keys += sub_select[:keys]
            #     joins << get_join(element)
            # end
        end
    end
    if (query.request.polymorphs? || !query.condition.polymorphs.empty?)
        only_conditions = {:conj => 'or', :values => []} if (query.request.only_polymorphs?)
        polymorphs = (query.request.polymorphs.keys + query.condition.polymorphs).uniq
        polymorphs.each do |model|
            polym_request = query.request.polymorphs[model] || Request.new
            extension_element = model.extended_models[@model]
            model.mapper.prepare_query_request(polym_request)
            polym_request.reject!{|k, v| 
                model.elements[k].integrated? && model.elements[k].integrated_from.name == extension_element
            }
            polym_only = {:conj => 'and', :values => []} if (query.request.only_polymorphs?)
            model.elements_array.select{ |el| el.attributes[:local_pk] }.each do |el|
                polym_request[el.name] = true
                if (query.request.only_polymorphs?)
                    polym_only[:values] << [model.mapper.schema.qualified_field(el.name), '<>', nil]
                end
            end
            only_conditions[:values] << polym_only if query.request.only_polymorphs?
            polym_select = model.mapper.prepare_select(Query.new(nil, polym_request)) # FIXME!
            polym_select[:keys].map!{ |key| "#{key} AS #{key.to_s.gsub('.', '_')}"}
            keys += polym_select[:keys]
            join_fields = {}
            @model.primary_keys.each do |key|
                from_field = @schema.field(key.name)
                to_field = model.mapper.schema.foreign_key_field(extension_element, key.name)
                join_fields[from_field] = to_field 
            end
            # FIXME: move to get_join
            join = {
                :type => :left,
                :from => @schema.table,
                :to => model.mapper.schema.table,
                :keys => join_fields
            }
            joins << join
        end

    end
    if (only_conditions)
        if (condition[:conj].downcase != 'and')
            condition = {:conj => 'and', :values => [condition]}
        end
        condition[:values] << only_conditions
    end
    tables = [schema.table]
    joins = prepare_joins(joins)
    return nil if (keys.empty?)
    return {
        :query_type => :select,
        :keys => keys,
        :primary_keys => primary_keys.uniq,
        :tables => tables,
        :condition => condition,
        :joins => joins,
        :order => order,
        :offset => query.offset,
        :limit => query.limit
    }
end

#prepare_update(obj) ⇒ Object

Update preprocessing



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 140

def prepare_update(obj) #:nodoc:
    save = prepare_save(obj, :update)
    return nil unless save[:values].length > 0
    condition = Condition.and
    @model.primary_keys.each do |key|
        condition[key.name] = obj.get(key)
    end
    preprocess_condition(condition)
    save[:condition], save[:joins] = prepare_condition(condition)
    save[:joins] = prepare_joins(save[:joins])
    save[:table] = @schema.table
    return @storage.sql_update(save)
end

#schema ⇒ Object

Returns @schema, or creates one.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 953

def schema
    @schema ||= get_schema()
    return @schema
end

#sequence_next(name) ⇒ Object

Next value for the named sequence



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 200

def sequence_next(name)
    return storage.sequence_next(schema.sequence(name))
end

#someone_have_references?(element) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 29

def someone_have_references?(element)
    element = @model.elements[element] unless element.is_a?(Element)
    if (element.integrated?)
        return element.model.someone_have_references?(element.attributes[:integrated_from_element])
    end
    return have_references?(element)
end

#sql_execute(sql, *values) ⇒ Object

Execute SQL directly, returning raw db results.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 82

def sql_execute(sql, *values)
    storage.execute(sql, *values)
end

#storage_column_attributes(type, attributes) ⇒ Object 



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 980

def storage_column_attributes(type, attributes)
    @storage.column_attributes(type, attributes)
end

#storage_column_type(type, attributes) ⇒ Object 



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 976

def storage_column_type(type, attributes)
    @storage.column_type(type, attributes)
end

#sync_schema(force = false, options = {}) ⇒ Object

Modifies the storage according to the schema.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 1112

def sync_schema(force=false, options={})
    compute_foreign_key_constraints unless options[:no_foreign_key_constraints] || !storage.supports?(:foreign_keys)
    schema_description = schema.get_schemas
    sequences = {}
    sequences[schema.table] = schema.sequences

    @model.elements_array.select{ |el| el.attributes[:anonymous_model] }.each do |el|
        next if el.model.mapper.class != self.class
        el.model.mapper.compute_foreign_key_constraints
        schema_description.merge!(el.model.mapper.schema.get_schemas)
        sequences[el.model.mapper.schema.table] ||= {}
        sequences[el.model.mapper.schema.table].merge!(el.model.mapper.schema.sequences)
        # Spider::Logger.debug("MERGING SEQUENCES:")
        # Spider::Logger.debug(el.model.mapper.schema.sequences)
        # sequences.merge!(el.model.mapper.schema.sequences)
    end
    schema_description.each do |table_name, table_schema|
        table_attributes = {
            :primary_keys => table_schema[:attributes][:primary_keys]
        }
        unless options[:no_foreign_key_constraints] || !storage.supports?(:foreign_keys)
            table_attributes[:foreign_key_constraints] = table_schema[:attributes][:foreign_key_constraints] || []
        end
        if @storage.table_exists?(table_name)
            alter_table(table_name, table_schema, table_attributes, force)
        else
            create_table(table_name, table_schema, table_attributes)
        end
        if (options[:drop_fields])
            current = @storage.describe_table(table_name)[:columns]
            current.each_key do |cur|
                @storage.drop_field(table_name, cur) if (!table_schema[:columns][cur])
            end
        end
    end
    seen = {}
    sequences.each do |sequence_table, table_sequences|
        table_sequences.each do |element_name, db_name|
            next if seen[db_name]
            if storage.sequence_exists?(db_name)
                if (options[:update_sequences])
                    sql = "SELECT MAX(#{schema.field(element_name).name}) AS M FROM #{sequence_table}"
                    res = @storage.execute(sql)
                    max = res[0]['M'].to_i
                    storage.update_sequence(db_name, max+1)
                end
            else
                storage.create_sequence(db_name)
            end
            seen[db_name] = true
        end
    end
end

#truncate! ⇒ Object 



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 72

def truncate!
    sql = storage.sql_truncate(schema.table)
    storage.execute(sql)
end

#with_schema(&proc) ⇒ Object

Extend schema. Given block will be instance_eval’d after schema auto generation. See also #define_schema.



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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 940

def with_schema(&proc)
    @schema_procs ||= []
    @schema_procs << proc
end