Module: ExpoTurbo::Rails::Format

Defined in:

lib/expo_turbo/rails/format.rb

Overview

Shared test for "this render is an Expo Turbo render". Every standard helper uses it to decide between Expo Turbo behavior and super, so one rule answers documents, Frames, Streams, IDs, and fragment cache keys.

The rule reads the format Rails selected for this render, never the Accept header on its own. A browser may name the Expo Turbo media type at a low quality; Rails then renders HTML, and a helper that disagreed with that choice would break an ordinary web page.

The selected format is not lookup_context.formats.first once a render is underway. ActionView prepends the format of the template it found, so a shared .html template answering a native request leaves :html there. The controller records the selection instead; the lookup context answers only for a view context Rails never assigned formats to, such as a broadcast.

A Turbo Stream response is the one format both audiences share, because its media type is the same for a browser and for a native client. There the selected format cannot separate them, so a verified native request decides.

Defined Under Namespace

Modules: Helper