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module ActiveRecord
# = Active Record Belongs To Has One Association
module Associations
class HasOneAssociation < AssociationProxy #:nodoc:
def create(attributes = {})
new_record(:create_association, attributes)
end
def create!(attributes = {})
new_record(:create_association!, attributes)
end
def build(attributes = {})
new_record(:build_association, attributes)
end
def replace(record, save = true)
record = record.target if AssociationProxy === record
raise_on_type_mismatch(record) unless record.nil?
load_target
if @target && @target != record
remove_target!(@reflection.options[:dependent])
end
if record
set_owner_attributes(record)
set_inverse_instance(record)
end
@target = record
loaded
if @owner.persisted? && record && save
record.save && self
else
record && self
end
end
private
def find_target
scoped.first.tap { |record| set_inverse_instance(record) }
end
def association_scope
super.order(@reflection.options[:order])
end
alias creation_attributes construct_owner_attributes
def new_record(method, attributes)
record = scoped.scoping { @reflection.send(method, attributes) }
replace(record, false)
record
end
def remove_target!(method)
if [:delete, :destroy].include?(method)
@target.send(method)
else
@target[@reflection.foreign_key] = nil
if @target.persisted? && @owner.persisted?
unless @target.save
@target[@reflection.foreign_key] = @target.send("#{@reflection.foreign_key}_was")
raise RecordNotSaved, "Failed to remove the existing associated #{@reflection.name}. " +
"The record failed to save when after its foreign key was set to nil."
end
end
end
end
end
end
end
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