vendor/rails/activerecord/lib/active_record/associations/belongs_to_polymorphic_association.rb

   1 module ActiveRecord
   2   module Associations
   3     class BelongsToPolymorphicAssociation < AssociationProxy #:nodoc:
   4       def replace(record)
   5         if record.nil?
   6           @target = @owner[@reflection.primary_key_name] = @owner[@reflection.options[:foreign_type]] = nil
   7         else
   8           @target = (AssociationProxy === record ? record.target : record)
   9
  10           @owner[@reflection.primary_key_name] = record.id
  11           @owner[@reflection.options[:foreign_type]] = record.class.base_class.name.to_s
  12
  13           @updated = true
  14         end
  15
  16         loaded
  17         record
  18       end
  19
  20       def updated?
  21         @updated
  22       end
  23
  24       private
  25         def find_target
  26           return nil if association_class.nil?
  27
  28           if @reflection.options[:conditions]
  29             association_class.find(
  30               @owner[@reflection.primary_key_name],
  31               :select     => @reflection.options[:select],
  32               :conditions => conditions,
  33               :include    => @reflection.options[:include]
  34             )
  35           else
  36             association_class.find(@owner[@reflection.primary_key_name], :select => @reflection.options[:select], :include => @reflection.options[:include])
  37           end
  38         end
  39
  40         def foreign_key_present
  41           !@owner[@reflection.primary_key_name].nil?
  42         end
  43
  44         def association_class
  45           @owner[@reflection.options[:foreign_type]] ? @owner[@reflection.options[:foreign_type]].constantize : nil
  46         end
  47     end
  48   end
  49 end