# This class is inherited by the has_one and belongs_to association classes
module ActiveRecord::Associations::Builder
class SingularAssociation < Association #:nodoc:
def valid_options
super + [:remote, :dependent, :primary_key, :inverse_of, :required]
end
def self.define_accessors(model, reflection)
super
define_constructors(model.generated_association_methods, reflection.name) if reflection.constructable?
end
# Defines the (build|create)_association methods for belongs_to or has_one association
def self.define_constructors(mixin, name)
mixin.class_eval <<-CODE, __FILE__, __LINE__ + 1
def build_#{name}(*args, &block)
association(:#{name}).build(*args, &block)
end
def create_#{name}(*args, &block)
association(:#{name}).create(*args, &block)
end
def create_#{name}!(*args, &block)
association(:#{name}).create!(*args, &block)
end
CODE
end
def self.define_validations(model, reflection)
super
if reflection.options[:required]
model.validates_presence_of reflection.name
end
end
end
end