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render_in: Skip emission of render_template.action_view - #3
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joelhawksley wants to merge 1 commit into
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Related to rails#57781 As reported in rails#57781, new calls to `#render_in` emit `render_template.action_view` Active Support notifications, which themselves cause a spike in object allocations. This commit explores an alternative that preserves the behavior introduced in [rails#50623][] (support for passing `:locals` at the `#render_in` call-site) without also emitting `render_template.action_view` notifications. Rather than rely on the `ActionView::Renderer` instance returned by the `ActionView::Helpers::RenderingHelper#view_renderer` invocation, construct an instance of `Template::Renderable` and invoke `#render` on it directly. [rails#50623]: rails#50623
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Motivation
Related to rails#57781.
Rendering objects that implement
render_innow emitsrender_template.action_viewnotifications, contributing to increased allocations in ViewComponent-heavy pages after rails#50623.Changes
Instantiate
ActionView::Template::Renderableand invokerenderdirectly instead of routing renderable objects throughActionView::Renderer. This preserves support for passing locals and blocks without emitting the outerrender_template.action_viewnotification.Includes regression coverage for both
render(object)andrender(renderable: object).Attribution
This draft carries Sean Doyle's original commit, unchanged, from
seanpdoyle/rails:issue-57781(f5f01f5d07f345265db205f4862e993b0b82cf39), submitted viajoelhawksley/rails.Validation
Tests have not been run as part of opening this draft.