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module ActiveRecord
# = Active Record Belongs To Has One Association
module Associations
class HasOneAssociation < SingularAssociation #:nodoc:
def handle_dependency
case options[:dependent]
when :restrict, :restrict_with_exception
raise ActiveRecord::DeleteRestrictionError.new(reflection.name) if load_target
when :restrict_with_error
if load_target
record = klass.human_attribute_name(reflection.name).downcase
owner.errors.add(:base, :"restrict_dependent_destroy.one", record: record)
false
end
else
delete
end
end
def replace(record, save = true)
raise_on_type_mismatch!(record) if record
load_target
return self.target if !(target || record)
if (target != record) || record.changed?
transaction_if(save) do
remove_target!(options[:dependent]) if target && !target.destroyed?
if record
set_owner_attributes(record)
set_inverse_instance(record)
if owner.persisted? && save && !record.save
nullify_owner_attributes(record)
set_owner_attributes(target) if target
raise RecordNotSaved, "Failed to save the new associated #{reflection.name}."
end
end
end
end
self.target = record
end
def delete(method = options[:dependent])
if load_target
case method
when :delete
target.delete
when :destroy
target.destroy
when :nullify
target.update_columns(reflection.foreign_key => nil)
end
end
end
private
# 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)
case method
when :delete
target.delete
when :destroy
target.destroy
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 after its foreign key was set to nil."
end
end
end
def nullify_owner_attributes(record)
record[reflection.foreign_key] = nil
end
def transaction_if(value)
if value
reflection.klass.transaction { yield }
else
yield
end
end
end
end
end
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