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The longstanding convention in Rails is that if the :action parameter is missing or nil then it defaults to 'index'. Up until Rails 5.0.0.beta1 this was handled slightly differently than other routing defaults by deleting it from the route options and adding it to the recall parameters. With the recent focus of removing unnecessary duplications this has exposed a problem in this strategy - we are now mutating the request's path parameters and causing problems for later url generation. This will typically affect url_for rather a named url helper since the latter explicitly pass :controller, :action, etc. The fix is to add a default for :action in the route class if the path contains an :action segment and no default is passed. This change also revealed an issue with the parameterized part expiry in that it doesn't follow a right to left order - as soon as a dynamic segment is required then all other segments become required. Fixes #23019. |
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= Action Pack -- From request to response Action Pack is a framework for handling and responding to web requests. It provides mechanisms for *routing* (mapping request URLs to actions), defining *controllers* that implement actions, and generating responses by rendering *views*, which are templates of various formats. In short, Action Pack provides the view and controller layers in the MVC paradigm. It consists of several modules: * Action Dispatch, which parses information about the web request, handles routing as defined by the user, and does advanced processing related to HTTP such as MIME-type negotiation, decoding parameters in POST, PATCH, or PUT bodies, handling HTTP caching logic, cookies and sessions. * Action Controller, which provides a base controller class that can be subclassed to implement filters and actions to handle requests. The result of an action is typically content generated from views. With the Ruby on Rails framework, users only directly interface with the Action Controller module. Necessary Action Dispatch functionality is activated by default and Action View rendering is implicitly triggered by Action Controller. However, these modules are designed to function on their own and can be used outside of Rails. == Download and installation The latest version of Action Pack can be installed with RubyGems: $ gem install actionpack Source code can be downloaded as part of the Rails project on GitHub * https://github.com/rails/rails/tree/master/actionpack == License Action Pack is released under the MIT license: * http://www.opensource.org/licenses/MIT == Support API documentation is at * http://api.rubyonrails.org Bug reports can be filed for the Ruby on Rails project here: * https://github.com/rails/rails/issues Feature requests should be discussed on the rails-core mailing list here: * https://groups.google.com/forum/?fromgroups#!forum/rubyonrails-core