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document that default_url_options is cached per request [ci skip]

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Xavier Noria 2015-06-15 21:38:15 +02:00
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guides/source/action_controller_overview.md
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@ -185,7 +185,9 @@ end
These options will be used as a starting point when generating URLs, so it's possible they'll be overridden by the options passed to `url_for` calls. These options will be used as a starting point when generating URLs, so it's possible they'll be overridden by the options passed to `url_for` calls.
If you define `default_url_options` in `ApplicationController`, as in the example above, it will be used for all URL generation. The method can also be defined in a specific controller, in which case it only affects URLs generated there. If you define `default_url_options` in `ApplicationController`, as in the example above, these defaults will be used for all URL generation. The method can also be defined in a specific controller, in which case it only affects URLs generated there.
In a given request, the method is not actually called for every single generated URL; for performance reasons, the returned hash is cached, there is at most one invocation per request.
### Strong Parameters ### Strong Parameters