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module ActiveRecord
# = Active Record Belongs To Has One Association
module Associations
class HasOneAssociation < SingularAssociation #:nodoc:
def replace(record, save = true)
record = check_record(record)
load_target
@reflection.klass.transaction do
if @target && @target != record
remove_target!(@reflection.options[:dependent])
end
if record
set_inverse_instance(record)
set_owner_attributes(record)
if @owner.persisted? && save && !record.save
nullify_owner_attributes(record)
set_owner_attributes(@target)
raise RecordNotSaved, "Failed to save the new associated #{@reflection.name}."
end
end
end
self.target = record
end
protected
def association_scope
super.order(@reflection.options[:order])
end
private
alias creation_attributes construct_owner_attributes
# The reason that the save param for replace is false, if for create (not just build),
# is because the setting of the foreign keys is actually handled by the scoping when
# the record is instantiated, and so they are set straight away and do not need to be
# updated within replace.
def set_new_record(record)
replace(record, false)
end
def remove_target!(method)
if [:delete, :destroy].include?(method)
@target.send(method)
else
nullify_owner_attributes(@target)
if @target.persisted? && @owner.persisted? && !@target.save
set_owner_attributes(@target)
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
def nullify_owner_attributes(record)
record[@reflection.foreign_key] = nil
end
end
end
end
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