Render outside request

To render outside of the usual request cycle or view context, e.g. in a model or a background job:

ApplicationController.render partial: 'cat'

To render a ViewComponent (renders the component including layout):

ApplicationController.render(
  CatComponent.new(cat: Cat.last)
)

To render a ViewComponent without a layout (useful when using TurboStream):

ApplicationController.render(
  CatComponent.new(cat: Cat.last),
  layout: false
)

To render with request parameters, useful when the controller defines default_url_options which are not available outside the request cycle:

ApplicationController
  .renderer
  .with_defaults(
    'action_dispatch.request.parameters' => { 'cat_id' => '13' }
  )
  .render(CatComponent.new(cat: Cat.last))