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module ActiveRecord
# = Active Record Belongs To Has One Association
module Associations
class HasOneAssociation < AssociationProxy #:nodoc:
def initialize(owner, reflection)
super
construct_sql
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 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 dependent? && !dont_save
case @reflection.options[:dependent]
when :delete
@target.delete unless @target.new_record?
@owner.clear_association_cache
when :destroy
@target.destroy unless @target.new_record?
@owner.clear_association_cache
when :nullify
@target[@reflection.primary_key_name] = nil
@target.save unless @owner.new_record? || @target.new_record?
end
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
set_inverse_instance(obj, @owner)
@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
protected
def owner_quoted_id
if @reflection.options[:primary_key]
@owner.class.quote_value(@owner.send(@reflection.options[:primary_key]))
else
@owner.quoted_id
end
end
private
def find_target
options = @reflection.options.dup
(options.keys - [:select, :order, :include, :readonly]).each do |key|
options.delete key
end
options[:conditions] = @finder_sql
the_target = @reflection.klass.find(:first, options)
set_inverse_instance(the_target, @owner)
the_target
end
def construct_sql
case
when @reflection.options[:as]
@finder_sql =
"#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_id = #{owner_quoted_id} AND " +
"#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_type = #{@owner.class.quote_value(@owner.class.base_class.name.to_s)}"
else
@finder_sql = "#{@reflection.quoted_table_name}.#{@reflection.primary_key_name} = #{owner_quoted_id}"
end
@finder_sql << " AND (#{conditions})" if conditions
end
def construct_scope
create_scoping = {}
set_belongs_to_association_for(create_scoping)
{ :create => create_scoping }
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 => construct_scope[:create]) do
yield @reflection
end
if replace_existing
replace(record, true)
else
record[@reflection.primary_key_name] = @owner.id unless @owner.new_record?
self.target = record
set_inverse_instance(record, @owner)
end
record
end
def we_can_set_the_inverse_on_this?(record)
inverse = @reflection.inverse_of
return !inverse.nil?
end
def merge_with_conditions(attrs={})
attrs ||= {}
attrs.update(@reflection.options[:conditions]) if @reflection.options[:conditions].is_a?(Hash)
attrs
end
end
end
end
|
