def belongs_to(association_id, options = {})
reflection = create_belongs_to_reflection(association_id, options)
if reflection.options[:polymorphic]
association_accessor_methods(reflection, BelongsToPolymorphicAssociation)
else
association_accessor_methods(reflection, BelongsToAssociation)
association_constructor_method(:build, reflection, BelongsToAssociation)
association_constructor_method(:create, reflection, BelongsToAssociation)
end
if options[:counter_cache]
cache_column = reflection.counter_cache_column
method_name = "belongs_to_counter_cache_after_create_for_#{reflection.name}".to_sym
define_method(method_name) do
association = send(reflection.name)
association.class.increment_counter(cache_column, send(reflection.primary_key_name)) unless association.nil?
end
after_create method_name
method_name = "belongs_to_counter_cache_before_destroy_for_#{reflection.name}".to_sym
define_method(method_name) do
association = send(reflection.name)
association.class.decrement_counter(cache_column, send(reflection.primary_key_name)) unless association.nil?
end
before_destroy method_name
module_eval(
"#{reflection.class_name}.send(:attr_readonly,\"#{cache_column}\".intern) if defined?(#{reflection.class_name}) && #{reflection.class_name}.respond_to?(:attr_readonly)"
)
end
configure_dependency_for_belongs_to(reflection)
end