You are browsing the Symfony 4 documentation, which changes significantly from Symfony 3.x. If your app doesn't use Symfony 4 yet, browse the Symfony 3.4 documentation.
Asset Versioning
Asset Versioning¶
Tired of deploying and having browser's cache the old version of your assets?
By calling enableVersioning(), each filename will now include a hash that
changes whenever the contents of that file change (e.g. app.123abc.js
instead of app.js). This allows you to use aggressive caching strategies
(e.g. a far future Expires) because, whenever a file change, its hash will change,
ignoring any existing cache:
1 2 3 4 5 6 7 | // webpack.config.js
// ...
Encore
.setOutputPath('public/build/')
// ...
+ .enableVersioning()
|
To link to these assets, Encore creates a manifest.json file with a map to
the new filenames.
Loading Assets from the manifest.json File¶
Whenever you run Encore, a manifest.json file is automatically
created in your outputPath directory:
1 2 3 4 | {
"build/app.js": "/build/app.123abc.js",
"build/dashboard.css": "/build/dashboard.a4bf2d.css"
}
|
In your app, you need to read this file to dynamically render the correct paths
in your script and link tags. If you're using Symfony, just activate the
json_manifest_file versioning strategy:
1 2 3 4 5 6 | # config/packages/framework.yaml
framework:
# ...
assets:
# feature is supported in Symfony 3.3 and higher
json_manifest_path: '%kernel.project_dir%/public/build/manifest.json'
|
That's it! Just be sure to wrap each path in the Twig asset() function
like normal:
1 2 3 | <script src="{{ asset('build/app.js') }}"></script>
<link href="{{ asset('build/dashboard.css') }}" rel="stylesheet" />
|
Learn more¶
This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.