Fix rails new to use stylesheet_link_tag "application" when --css is present #56086
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…present
When generating a Rails app with CSS bundling, e.g., `rails new myapp --css tailwind --js esbuild`, the browser shows:
GET /assets/tailwindcss net::ERR_ABORTED 404 (Not Found)
The problem:
1. CSS build tools output to `app/assets/builds/application.css`
2. The generated layout has `stylesheet_link_tag :app`, which expands to link tags for ALL .css files in app/assets/:
<link rel="stylesheet" href="/assets/application-{hash}.css">
<link rel="stylesheet" href="/assets/application.tailwind-{hash}.css">
3. The source file application.tailwind.css shouldn't be served directly: only the built output (application.css) should be linked.
This fix:
- Adds `using_css_bundling?` helper to detect when CSS bundlers are used
- Updates layout template to use "application" when --css is present
- Applies to all CSS bundlers (tailwind, sass, postcss, bootstrap, bulma)
brunoprietog
reviewed
Nov 5, 2025
| end | ||
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| def using_css_bundling? | ||
| options[:skip_asset_pipeline] || options[:css] |
Contributor
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This is not correct. You can use the tailwindcss-rails gem without using CSS Bundling, and this change will not include the tailwind.css file that is generated after Tailwind does the build.
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I've opened #56111 to fix this, cc @guilleiguaran
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When generating a Rails app with CSS bundling, e.g.,
rails new myapp --css tailwind --js esbuild, the browser console shows:GET /assets/tailwindcss net::ERR_ABORTED 404 (Not Found)
The problem:
CSS build tools output to
app/assets/builds/application.cssThe generated layout has
stylesheet_link_tag :app, which expands to link tags for ALL .css files in app/assets/:The source file application.tailwind.css shouldn't be served directly: only the built output (application.css) should be linked.
This fix:
using_css_bundling?helper to detect when CSS bundlers are usedRelated: rails/cssbundling-rails#175, rails/cssbundling-rails@1332e42