Module: Grape::Mountable

Included in:

API, API::Instance

Defined in:

lib/grape/mountable.rb

Overview

Marker module for a mountable Grape application. Both API (the remountable user-facing class) and API::Instance (the compiled engine) extend it, so a mounted Grape app can be told apart from a bare Rack app with is_a?(Grape::Mountable) — a single, explicit predicate rather than duck-typing on an incidental internal method such as inheritable_setting.

Grape::API and Grape::API::Instance are not related by inheritance and do not even respond to the same methods (the former to mount_instance, the latter to inheritable_setting/endpoints), so there is no common ancestor to key an is_a? check on without this marker.

It answers identity only ("is this a Grape app?"). Capability checks that go on to call a stage-specific method — e.g. respond_to?(:endpoints) before reading endpoints — must stay as they are, since a Mountable does not necessarily respond to every such method.