Class: DataMapper::Associations::BelongsToAssociation

Inherits:
HasNAssociation show all
Defined in:
lib/data_mapper/associations/belongs_to_association.rb

Defined Under Namespace

Classes: Instance

Constant Summary

Constants inherited from HasNAssociation

HasNAssociation::OPTIONS

Instance Attribute Summary

Attributes inherited from HasNAssociation

#options

Instance Method Summary collapse

Methods inherited from HasNAssociation

#activate!, #associated_columns, #associated_constant_name, #associated_table, #finder_options, #foreign_key_column, #foreign_key_type, #initialize, #key_table, #name, #primary_key_column

Constructor Details

This class inherits a constructor from DataMapper::Associations::HasNAssociation

Instance Method Details

#associated_constant ⇒ Object 



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# File 'lib/data_mapper/associations/belongs_to_association.rb', line 36

def associated_constant
  @constant
end

#constant ⇒ Object

Reverse the natural order for BelongsToAssociations



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# File 'lib/data_mapper/associations/belongs_to_association.rb', line 35

alias constant associated_constant

#define_accessor(klass) ⇒ Object 



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# File 'lib/data_mapper/associations/belongs_to_association.rb', line 8

def define_accessor(klass)        
  klass.class_eval <<-EOS
    
    def create_#{@association_name}(options = {})
      #{@association_name}_association.create(options)
    end
    
    def build_#{@association_name}(options = {})
      #{@association_name}_association.build(options)
    end
    
    def #{@association_name}
      #{@association_name}_association.instance
    end
    
    def #{@association_name}=(value)
      #{@association_name}_association.set(value)
    end
    
    private
      def #{@association_name}_association
        @#{@association_name} || (@#{@association_name} = DataMapper::Associations::BelongsToAssociation::Instance.new(self, #{@association_name.inspect}))
      end
  EOS
end

#foreign_key_name ⇒ Object 



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# File 'lib/data_mapper/associations/belongs_to_association.rb', line 40

def foreign_key_name
  @foreign_key_name || @foreign_key_name = (@options[:foreign_key] || "#{name}_#{key_table.key.name}".to_sym)
end

#to_sql ⇒ Object 



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# File 'lib/data_mapper/associations/belongs_to_association.rb', line 44

def to_sql
  "JOIN #{key_table.to_sql} ON #{foreign_key_column.to_sql(true)} = #{primary_key_column.to_sql(true)}"
end