Module: InertiaJb::Renderer

Defined in:

lib/inertia_jb/renderer.rb

Overview

Prepended onto ActionView::TemplateRenderer to guarantee that a .html.inertia template is never wrapped in a layout.

An .inertia template's body (see Handler) throws its props Hash back to the controller before it produces any output, so a surrounding layout is always discarded. Left alone, Rails would still resolve and compile the controller's layout and emit phantom render_layout.action_view / render_template.action_view events for it — their ensure blocks fire as the throw unwinds the stack — whose timing absorbs the prop-building work, polluting request logs and APM traces with a layout render that never actually happened.

render_template is the one point where Rails has already resolved the template (so we can see its handler) but has not yet looked up the layout (find_layout runs one call deeper, in render_with_layout). Nulling the layout here for our handler skips the lookup entirely — cleanly, without the controller having to guess in advance which template an action will render.

This only affects our own templates. The real Inertia shell is applied later by inertia-rails when it renders the inertia root template (an ERB template) with config.layout, and plain .erb/.jb templates keep their layouts exactly as in vanilla Rails.