ruby-grape / grape / 28701529671 / 3

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Pull #2777

github

Add mounted_app reader and app: keyword to Grape::Endpoint

`app` (the Rack app or Grape API mounted at an endpoint) was reachable
only by digging into the public options bag as `endpoint.options[:app]`.

Introduce a first-class `mounted_app` reader (returning `config.app`,
`nil` for a plain block endpoint) and accept `app:` as an explicit
keyword on `Grape::Endpoint#initialize`. Grape's own mount-refresh dedup
now reads `endpoint.mounted_app` instead of `options[:app]`.

This is additive and non-breaking: `options[:app]` is still populated
exactly as before for downstream consumers (e.g. grape-swagger), which
can migrate to `mounted_app` before it is eventually dropped from the
options Hash. Also adds the previously-missing coverage for the
`refresh_already_mounted` dedup path.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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