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require 'active_support/core_ext/object/inclusion'
module ActiveRecord::Associations::Builder
class HasOne < SingularAssociation #:nodoc:
self.macro = :has_one
self.valid_options += [:order, :as]
class_attribute :through_options
self.through_options = [:through, :source, :source_type]
def constructable?
!options[:through]
end
def build
reflection = super
configure_dependency unless options[:through]
reflection
end
private
def validate_options
valid_options = self.class.valid_options
valid_options += self.class.through_options if options[:through]
options.assert_valid_keys(valid_options)
end
def configure_dependency
if options[:dependent]
unless options[:dependent].either?(:destroy, :delete, :nullify, :restrict)
raise ArgumentError, "The :dependent option expects either :destroy, :delete, " \
":nullify or :restrict (#{options[:dependent].inspect})"
end
send("define_#{options[:dependent]}_dependency_method")
model.before_destroy dependency_method_name
end
end
def dependency_method_name
"has_one_dependent_#{options[:dependent]}_for_#{name}"
end
def define_destroy_dependency_method
model.send(:class_eval, <<-eoruby, __FILE__, __LINE__ + 1)
def #{dependency_method_name}
association(#{name.to_sym.inspect}).delete
end
eoruby
end
alias :define_delete_dependency_method :define_destroy_dependency_method
alias :define_nullify_dependency_method :define_destroy_dependency_method
def define_restrict_dependency_method
name = self.name
model.redefine_method(dependency_method_name) do
raise ActiveRecord::DeleteRestrictionError.new(name) unless send(name).nil?
end
end
end
end
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