module ActionController::ImplicitRender
Action Controller Implicit Render
Handles implicit rendering for a controller action that does not explicitly respond with render
, respond_to
, redirect
, or head
.
For API controllers, the implicit response is always 204 No Content
.
For all other controllers, we use these heuristics to decide whether to render a template, raise an error for a missing template, or respond with 204 No Content
:
First, if we DO find a template, it’s rendered. Template lookup accounts for the action name, locales, format, variant, template handlers, and more (see render
for details).
Second, if we DON’T find a template but the controller action does have templates for other formats, variants, etc., then we trust that you meant to provide a template for this response, too, and we raise ActionController::UnknownFormat with an explanation.
Third, if we DON’T find a template AND the request is a page load in a web browser (technically, a non-XHR GET request for an HTML response) where you reasonably expect to have rendered a template, then we raise ActionController::MissingExactTemplate with an explanation.
Finally, if we DON’T find a template AND the request isn’t a browser page load, then we implicitly respond with 204 No Content
.