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module ActiveRecord
# = Active Record Belongs To Has One Association
module Associations
class HasOneAssociation < AssociationProxy #:nodoc:
include HasAssociation
def create(attrs = {}, replace_existing = true)
new_record(replace_existing) do |reflection|
attrs = merge_with_conditions(attrs)
reflection.create_association(attrs)
end
end
def create!(attrs = {}, replace_existing = true)
new_record(replace_existing) do |reflection|
attrs = merge_with_conditions(attrs)
reflection.create_association!(attrs)
end
end
def build(attrs = {}, replace_existing = true)
new_record(replace_existing) do |reflection|
attrs = merge_with_conditions(attrs)
reflection.build_association(attrs)
end
end
def replace(obj, dont_save = false)
load_target
unless @target.nil? || @target == obj
if @reflection.options[:dependent] && !dont_save
case @reflection.options[:dependent]
when :delete
@target.delete if @target.persisted?
when :destroy
@target.destroy if @target.persisted?
when :nullify
@target[@reflection.foreign_key] = nil
@target.save if @owner.persisted? && @target.persisted?
end
else
@target[@reflection.foreign_key] = nil
@target.save if @owner.persisted? && @target.persisted?
end
end
if obj.nil?
@target = nil
else
raise_on_type_mismatch(obj)
set_owner_attributes(obj)
@target = (AssociationProxy === obj ? obj.target : obj)
end
set_inverse_instance(obj)
loaded
unless !@owner.persisted? || obj.nil? || dont_save
return (obj.save ? self : false)
else
return (obj.nil? ? nil : self)
end
end
private
def find_target
options = @reflection.options.dup.slice(:select, :order, :include, :readonly)
the_target = with_scope(:find => @scope[:find]) do
@reflection.klass.find(:first, options)
end
set_inverse_instance(the_target)
the_target
end
def construct_find_scope
{ :conditions => construct_conditions }
end
def construct_create_scope
construct_owner_attributes
end
def new_record(replace_existing)
# Make sure we load the target first, if we plan on replacing the existing
# instance. Otherwise, if the target has not previously been loaded
# elsewhere, the instance we create will get orphaned.
load_target if replace_existing
record = @reflection.klass.send(:with_scope, :create => @scope[:create]) do
yield @reflection
end
if replace_existing
replace(record, true)
else
record[@reflection.foreign_key] = @owner.id if @owner.persisted?
self.target = record
set_inverse_instance(record)
end
record
end
def merge_with_conditions(attrs={})
attrs ||= {}
attrs.update(@reflection.options[:conditions]) if @reflection.options[:conditions].is_a?(Hash)
attrs
end
end
end
end
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