Class: Netzke::Basepack::DataAdapters::ActiveRecordAdapter

Inherits:
AbstractAdapter
  • Object
show all
Defined in:
lib/netzke/basepack/data_adapters/active_record_adapter.rb

Overview

Implementation of AbstractAdapter

Instance Attribute Summary

Attributes inherited from AbstractAdapter

#model

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from AbstractAdapter

adapter_class, #assoc_values, #association_attr?, #errors_array, #find_record_children, #find_root_records, #first, #get_property_type, inherited, #initialize, #map_type, #model_respond_to?, #primary_key_attr?, #root, #save_record

Constructor Details

This class inherits a constructor from Netzke::Basepack::DataAdapters::AbstractAdapter

Class Method Details

.for_class?(model) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 4

def self.for_class?(model)
  model && model <= ActiveRecord::Base
end

Instance Method Details

#attr_type(attr_name) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 37

def attr_type(attr_name)
  method, assoc = method_and_assoc(attr_name)
  klass = assoc.nil? ? @model : assoc.klass
  klass.columns_hash[method].try(:type) || :string
end

#attribute_names ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 33

def attribute_names
  @model.column_names
end

#class_for(assoc_name) ⇒ Object

Returns the model class for association columns



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 129

def class_for assoc_name
  @model.reflect_on_association(assoc_name.to_sym).klass
end

#combo_data(attr, query = "") ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 85

def combo_data(attr, query = "")
  method, assoc = method_and_assoc(attr[:name])

  if assoc
    # Options for an asssociation attribute

    relation = assoc.klass.all

    relation = extend_relation_with_scope(relation, attr[:scope])

    if attr[:filter_association_with]
      relation = attr[:filter_association_with].call(relation, query).to_a
      if attr[:getter]
        relation.map{ |r| [r.id, attr[:getter].call(r)] }
      else
        relation.map{ |r| [r.id, r.send(method)] }
      end
    elsif assoc.klass.column_names.include?(method)
      # apply query
      assoc_arel_table = assoc.klass.arel_table

      relation = relation.where(assoc_arel_table[method].matches("%#{query}%"))  if query.present?
      relation.to_a.map{ |r| [r.id, r.send(method)] }
    else
      query.downcase!
      # an expensive search!
      relation.to_a.map{ |r| [r.id, r.send(method)] }.select{ |id,value| value.to_s.downcase.include?(query) }
    end

  else
    distinct_combo_values(attr, query)
  end
end

#count_records(params, columns = []) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 54

def count_records(params, columns=[])
  # if get_relation was called before (e.g. through get_records), don't call it again, just use its latest result
  relation = @relation || get_relation(params)

  # addressing the n+1 query problem
  columns.each do |c|
    assoc, method = c[:name].split('__')
    relation = relation.includes(assoc.to_sym).references(assoc.to_sym) if method
  end

  relation.count
end

#destroy(ids) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 133

def destroy(ids)
  @model.destroy(ids)
end

#distinct_combo_values(attr, query) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 119

def distinct_combo_values(attr, query)
  records = query.empty? ? @model.find_by_sql("select distinct #{attr[:name]} from #{@model.table_name}") : @model.find_by_sql("select distinct #{attr[:name]} from #{@model.table_name} where #{attr[:name]} like '#{query}%'")
  records.map{|r| [r.send(attr[:name]), r.send(attr[:name])]}
end

#find_record(id, options = {}) ⇒ Object

Returns a record by id. Respects the following options:

  • scope - will only return a record if it falls into the provided scope


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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 140

def find_record(id, options = {})
  # scope = options[:scope] || {}
  relation = @model.where(primary_key => id)
  relation = options[:scope].call(relation) if options[:scope].is_a?(Proc)
  relation.first
end

#foreign_key_for(assoc_name) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 124

def foreign_key_for assoc_name
  @model.reflect_on_association(assoc_name.to_sym).foreign_key
end

#get_assoc_property_type(assoc_name, prop_name) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 67

def get_assoc_property_type assoc_name, prop_name
  if prop_name && assoc = @model.reflect_on_association(assoc_name)
    assoc_column = assoc.klass.columns_hash[prop_name.to_s]
    assoc_column.try(:type)
  end
end

#get_records(params, columns = []) ⇒ Object

Implementation for Netzke::Basepack::DataAdapters::AbstractAdapter#get_records



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 44

def get_records(params, columns=[])
  relation = get_relation(params)

  relation = fix_nplus1_problem(relation, columns)

  relation = apply_sorting(relation, columns, params[:sorters])

  relation = apply_offset(relation, params)
end

#get_relation(params = {}) ⇒ Object

An ActiveRecord::Relation instance encapsulating all the necessary conditions.



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 283

def get_relation(params = {})
  relation = @model.all

  query = params[:query]

  if query.present?
    cannot_use_procs = query.size > 1

    and_predicates = query.map do |and_query|
      and_query.each do |q|
        if prok = q.delete(:proc)
          raise "Cannot use Proc conditions in OR queries" if cannot_use_procs
          relation = prok.call(relation, q[:value], q[:operator])
          and_query.delete(q)
        end
      end

      predicates_for_and_conditions(and_query)
    end

    # join them by OR
    predicates = and_predicates[1..-1].inject(and_predicates.first){ |r,c| r.or(c) }
    relation = relation.where(predicates)
  end

  if params[:filters]
    and_query = params[:filters]
    and_query.each do |q|
      relation = q[:proc].call(relation, q[:value], q[:operator]) if q[:proc]
    end

    and_query.delete_if{|q| q[:proc] }

    # apply other, non-Proc filters
    relation = relation.where(predicates_for_and_conditions(and_query))
  end

  relation = extend_relation_with_scope(relation, params[:scope])

  @relation = relation
end

#hash_fk_model ⇒ Object

Build a hash of foreign keys and the associated model



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 148

def hash_fk_model
  foreign_keys = {}
  @model.reflect_on_all_associations(:belongs_to).map{ |r|
    foreign_keys[r.association_foreign_key.to_sym] = r.name
  }
  foreign_keys
end

#human_attribute_name(name) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 186

def human_attribute_name(name)
  @model.human_attribute_name(name)
end

#method_and_assoc(attr_name) ⇒ Object

If association attribute is given, returns [method, association] Else returns [attr_name]



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 276

def method_and_assoc(attr_name)
  assoc_name, method = attr_name.to_s.split('__')
  assoc = @model.reflect_on_association(assoc_name.to_sym) if method
  assoc.nil? ? [attr_name] : [method, assoc]
end

#model_attributes ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 16

def model_attributes
  @model_attributes ||= attribute_names.map do |column_name|
    # If it's named as foreign key of some association, then it's an association column
    assoc = @model.reflect_on_all_associations.detect { |a| a.foreign_key == column_name }

    if assoc && !assoc.options[:polymorphic]
      candidates = %w{name title label} << assoc.klass.primary_key
      assoc_method = candidates.detect{|m| (assoc.klass.instance_methods.map(&:to_s) + assoc.klass.column_names).include?(m) }
      :"#{assoc.name}__#{assoc_method}"
    else
      column_name.to_sym
    end
    # auto set up the default value from the column settings
    # c[:default_value] = @model.columns_hash[column_name].default if @model.columns_hash[column_name].default
  end
end

#move_records(params) ⇒ Object

FIXME



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 157

def move_records(params)
  if defined?(ActsAsList) && @model.ancestors.include?(ActsAsList::InstanceMethods)
    ids = JSON.parse(params[:ids]).reverse
    ids.each_with_index do |id, i|
      r = @model.find(id)
      r.insert_at(params[:new_index].to_i + i + 1)
    end
    on_data_changed # copypaste nonsense
  else
    raise RuntimeError, "Model class should implement 'acts_as_list' to support reordering records"
  end
end

#new_record(params = {}) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 8

def new_record(params = {})
  @model.new(params)
end

#predicates_for_and_conditions(conditions) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 325

def predicates_for_and_conditions(conditions)
  return nil if conditions.empty?

  predicates = conditions.map do |q|
    q = HashWithIndifferentAccess.new(Netzke::Support.permit_hash_params(q))

    attr = q[:attr]
    method, assoc = method_and_assoc(attr)

    arel_table = assoc ? Arel::Table.new(assoc.klass.table_name.to_sym) : @model.arel_table

    value = q["value"]
    op = q["operator"]

    attr_type = attr_type(attr)

    case attr_type
    when :datetime
      update_predecate_for_datetime(arel_table[method], op, value.to_date)
    when :string, :text
      update_predecate_for_string(arel_table[method], op, value)
    when :boolean
      update_predecate_for_boolean(arel_table[method], op, value)
    when :date
      update_predecate_for_rest(arel_table[method], op, value.to_date)
    else
      update_predecate_for_rest(arel_table[method], op, value)
    end
  end

  # join them by AND
  predicates[1..-1].inject(predicates.first){ |r,p| r.and(p)  }
end

#primary_key ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 12

def primary_key
  @model.primary_key.to_s
end

#record_to_array(r, attrs) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 170

def record_to_array(r, attrs)
  [].tap do |res|
    attrs.each do |a|
      res << record_value_for_attribute(r, a, a[:nested_attribute]) if a[:included] != false # :included ever used?..
    end
  end
end

#record_to_hash(r, attrs) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 178

def record_to_hash(r, attrs)
  {}.tap do |res|
    attrs.each do |a|
      res[a[:name].to_sym] = record_value_for_attribute(r, a, a[:nested_attribute]) if a[:included] != false
    end
  end
end

#record_value_for_attribute(r, a, through_association = false) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 190

def record_value_for_attribute(r, a, through_association = false)
  v = if association_attr?(a)
    split = a[:name].to_s.split(/\.|__/)
    assoc = @model.reflect_on_association(split.first.to_sym)
    if through_association
      split.inject(r) do |r, m| # Do we *really* need to descend deeper than 1 level?
        return nil if r.nil?

        # On the last iteration call the getter block
        if a[:getter] && split.last.equal?(m)
          a[:getter].call(r)
        elsif r.respond_to?(m)
          r.send(m)
        else
          logger.warn "Netzke: Wrong attribute name: #{a[:name]}" unless r.nil?
          nil
        end
      end
    else
      r.send("#{assoc.options[:foreign_key] || assoc.name.to_s.foreign_key}")
    end
  elsif a[:getter]
    a[:getter].call(r)
  elsif r.respond_to?("#{a[:name]}")
    r.send("#{a[:name]}")

  # the composite_primary_keys gem produces [Key1,Key2...] and [Value1,Value2...]
  # on primary_key and id requests. Basepack::AttrConfig converts the keys-array to an String.
  elsif primary_key.try(:to_s) == a[:name]
    r.id # return 'val1,val2...' on 'key1,key2...' composite_primary_keys
  end

  # a work-around for to_json not taking the current timezone into account when serializing ActiveSupport::TimeWithZone
  v = v.to_datetime.to_s(:db) if [ActiveSupport::TimeWithZone].include?(v.class)

  v
end

#set_record_value_for_attribute(record, attr, value) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 228

def set_record_value_for_attribute(record, attr, value)
  value = value.to_time_in_current_zone if value.is_a?(Date) # convert Date to Time
  unless attr[:read_only]
    if attr[:setter]
      attr[:setter].call(record, value)
    elsif record.respond_to?("#{attr[:name]}=")
      record.send("#{attr[:name]}=", value)
    elsif association_attr?(attr)
      split = attr[:name].to_s.split(/\.|__/)
      if attr[:nested_attribute]
        # We want:
        #     set_value_for_attribute({:name => :assoc_1__assoc_2__method, :nested_attribute => true}, 100)
        # =>
        #     record.assoc_1.assoc_2.method = 100
        split.inject(record) { |r,m| m == split.last ? (r && r.send("#{m}=", value) && r.save) : r.send(m) }
      else
        if split.size == 2
          # search for association and assign it to r
          assoc = @model.reflect_on_association(split.first.to_sym)
          assoc_method = split.last
          if assoc
            if assoc.macro == :has_one
              assoc_instance = record.send(assoc.name)
              if assoc_instance
                assoc_instance.send("#{assoc_method}=", value)
                assoc_instance.save # what should we do when this fails?..
              else
                # what should we do in this case?
              end
            else

              # set the foreign key to the passed value
              # not that if a negative value is passed, we reset the association (set it to nil)
              record.send("#{assoc.foreign_key}=", value.to_i < 0 ? nil : value)
            end
          else
            logger.warn "Netzke: Association #{assoc} is not known for class #{@model}"
          end
        else
          logger.warn "Netzke: Wrong attribute name: #{attr[:name]}"
        end
      end
    end
  end
end

#update_predecate_for_boolean(table, op, value) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 359

def update_predecate_for_boolean(table, op, value)
  table.eq(value)
end

#update_predecate_for_datetime(table, op, value) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 367

def update_predecate_for_datetime(table, op, value)
  case op
  when "eq"
    table.lteq(value.end_of_day).and(table.gteq(value.beginning_of_day))
  when "gt"
    table.gt(value.end_of_day)
  when "lt"
    table.lt(value.beginning_of_day)
  when "gteq"
    table.gteq(value.beginning_of_day)
  when "lteq"
    table.lteq(value.end_of_day)
  end
end

#update_predecate_for_rest(table, op, value) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 382

def update_predecate_for_rest(table, op, value)
  legal_ops = %w[eq gt lt gteq lteq]

  if legal_ops.include?(op.to_s)
    table.send(op, value)
  else
    logger.warn("Netzke: Illegal filter operator: #{op}")
    table
  end
end

#update_predecate_for_string(table, op, value) ⇒ Object 



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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 363

def update_predecate_for_string(table, op, value)
  table.matches "%#{value}%"
end

#virtual_attribute?(c) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/netzke/basepack/data_adapters/active_record_adapter.rb', line 74

def virtual_attribute?(c)
  assoc_name, asso = c[:name].split('__')
  method, assoc = method_and_assoc(c[:name])

  if assoc
    return !assoc.klass.column_names.include?(method)
  else
    return !@model.column_names.include?(c[:name])
  end
end