module ActiveRecord module Associations class HasOneAssociation < BelongsToAssociation #:nodoc: def initialize(owner, reflection) super construct_sql end def create(attributes = {}, replace_existing = true) record = build(attributes, replace_existing) record.save record end def build(attributes = {}, replace_existing = true) record = @reflection.klass.new(attributes) if replace_existing replace(record, true) else record[@reflection.primary_key_name] = @owner.id unless @owner.new_record? self.target = record end record end def replace(obj, dont_save = false) load_target unless @target.nil? if dependent? && !dont_save && @target != obj @target.destroy unless @target.new_record? @owner.clear_association_cache else @target[@reflection.primary_key_name] = nil @target.save unless @owner.new_record? || @target.new_record? end end if obj.nil? @target = nil else raise_on_type_mismatch(obj) set_belongs_to_association_for(obj) @target = (AssociationProxy === obj ? obj.target : obj) end @loaded = true unless @owner.new_record? or obj.nil? or dont_save return (obj.save ? self : false) else return (obj.nil? ? nil : self) end end private def find_target @reflection.klass.find(:first, :conditions => @finder_sql, :order => @reflection.options[:order], :include => @reflection.options[:include] ) end def construct_sql case when @reflection.options[:as] @finder_sql = "#{@reflection.klass.table_name}.#{@reflection.options[:as]}_id = #{@owner.quoted_id} AND " + "#{@reflection.klass.table_name}.#{@reflection.options[:as]}_type = #{@owner.class.quote_value(@owner.class.base_class.name.to_s)}" else @finder_sql = "#{@reflection.table_name}.#{@reflection.primary_key_name} = #{@owner.quoted_id}" end @finder_sql << " AND (#{conditions})" if conditions end end end end