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

   1 module ActiveRecord
   2   module Associations
   3     class BelongsToAssociation < AssociationProxy #:nodoc:
   4       def create(attributes = {})
   5         replace(@reflection.create_association(attributes))
   6       end
   7
   8       def build(attributes = {})
   9         replace(@reflection.build_association(attributes))
  10       end
  11
  12       def replace(record)
  13         counter_cache_name = @reflection.counter_cache_column
  14
  15         if record.nil?
  16           if counter_cache_name && !@owner.new_record?
  17             @reflection.klass.decrement_counter(counter_cache_name, @owner[@reflection.primary_key_name]) if @owner[@reflection.primary_key_name]
  18           end
  19
  20           @target = @owner[@reflection.primary_key_name] = nil
  21         else
  22           raise_on_type_mismatch(record)
  23
  24           if counter_cache_name && !@owner.new_record?
  25             @reflection.klass.increment_counter(counter_cache_name, record.id)
  26             @reflection.klass.decrement_counter(counter_cache_name, @owner[@reflection.primary_key_name]) if @owner[@reflection.primary_key_name]
  27           end
  28
  29           @target = (AssociationProxy === record ? record.target : record)
  30           @owner[@reflection.primary_key_name] = record.id unless record.new_record?
  31           @updated = true
  32         end
  33
  34         loaded
  35         record
  36       end
  37
  38       def updated?
  39         @updated
  40       end
  41
  42       private
  43         def find_target
  44           @reflection.klass.find(
  45             @owner[@reflection.primary_key_name],
  46             :select     => @reflection.options[:select],
  47             :conditions => conditions,
  48             :include    => @reflection.options[:include],
  49             :readonly   => @reflection.options[:readonly]
  50           )
  51         end
  52
  53         def foreign_key_present
  54           !@owner[@reflection.primary_key_name].nil?
  55         end
  56     end
  57   end
  58 end