Module: Tanuki::MetaModelBehavior

Included in:
Tanuki_MetaModel
Defined in:
lib/tanuki/behavior/meta_model_behavior.rb

Overview

Tanuki::MetaModelBehavior contains all methods for the meta-model. In is included in the meta-model class.

Instance Method Summary collapse

Instance Method Details

#class_name_for(class_type) ⇒ Object

Returns class name for a given class type.



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# File 'lib/tanuki/behavior/meta_model_behavior.rb', line 18

def class_name_for(class_type)
  case class_type
  when :model, :model_base then "#{@namespace}_Model_#{@name}"
  when :manager, :manager_base then "#{@namespace}_Manager_#{@name}"
  end
end

#initialize(namespace, name, data, models) ⇒ Object

Creates new meta-model name in namespace. Model schema is passed as data. Stucture models contains all models being generated.



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# File 'lib/tanuki/behavior/meta_model_behavior.rb', line 10

def initialize(namespace, name, data, models)
  @namespace = namespace
  @name = name
  @data = data
  @models = models
end

#key ⇒ Object

Returns an array of code for alias-column name pair.



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# File 'lib/tanuki/behavior/meta_model_behavior.rb', line 26

def key
  @key.inspect
end

#process! ⇒ Object

Prepares data for template generation. Processes own keys, fields, etc.



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# File 'lib/tanuki/behavior/meta_model_behavior.rb', line 32

def process!
  process_source!
  process_key!
end

#process_joins! ⇒ Object 



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# File 'lib/tanuki/behavior/meta_model_behavior.rb', line 63

def process_joins!
  @joins = {}
  @joins[@first_source] = nil
end

#process_key! ⇒ Object 



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# File 'lib/tanuki/behavior/meta_model_behavior.rb', line 37

def process_key!
  @key = @source['key'] || 'id'
  @key = [@key] if @key.is_a? String
  raise 'invalid key' unless @key.is_a? Array
  @key.map! do |k|
    parts = k.split('.').map {|p| p.to_sym }
    raise "invalid key field #{k}" if parts.count > 2
    if parts.count == 2
      raise 'all key fields should belong to the first-source' if parts[0] != @first_source.to_s
      parts
    else
      [@first_source, parts[0]]
    end
  end
end

#process_relations! ⇒ Object

Prepares data for template generation. Processes foreign keys, fields, etc.



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# File 'lib/tanuki/behavior/meta_model_behavior.rb', line 70

def process_relations!
  joins = @source['joins'] || {}
  joins = [joins] if joins.is_a? String
  joins = Hash[*joins.collect {|v| [v, nil] }.flatten] if joins.is_a? Array
  if joins.is_a? Hash
    joins.each_pair do |table_alias, join|
      table_alias = table_alias.to_sym
      raise "#{table_alias} is already in use" if @joins.include? table_alias
      if join
        if join['on'].is_a Hash
          table_name = join['table'] || table_alias
          on = join['on']
        else
          on = join
          table_name = table_alias
        end
      else
         on = nil
         table_name = table_alias
      end
      if on
      else
        on = {}
        @key.each do |k|
          on[[table_alias, @first_source.to_s.singularize.to_sym]] = []
          # TODO choose a right priciple
        end
      end
    end
  else
    raise "`joins' should be either nil or string or array or hash"
  end
end

#process_source! ⇒ Object

Extracts the model firts-source information form the YAML @data and performs



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# File 'lib/tanuki/behavior/meta_model_behavior.rb', line 55

def process_source!
  guess_table = @name.pluralize
  @data ||= {}
  @source = @data['source'] || guess_table
  @source = {'table' => @source} if @source.is_a? String
  @first_source = (@source['table'] || guess_table).downcase.to_sym
end

#qualified_name(field_name) ⇒ Object

Returns code for alias-column name pair for field field_name.



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# File 'lib/tanuki/behavior/meta_model_behavior.rb', line 105

def qualified_name(field_name)
  parts = field_name.split('.')
  if parts.length == 1
    "%w{:#{@first_source} :#{field_name}}"
  elsif parts.length == 2
    "%w{:#{parts[0]} :#{parts[1]}}"
  else
    raise "field name for model #{@namespace}.#{@name} is invalid"
  end
end