Flowdock
Ruby on Rails latest stable (v4.0.2) - 0 notes

Module deprecated or moved

This module is deprecated or moved on the latest stable version. The last existing version (v2.3.8) is shown here.

Polymorphic URL helpers are methods for smart resolution to a named route call when given an Active Record model instance. They are to be used in combination with ActionController::Resources.

These methods are useful when you want to generate correct URL or path to a RESTful resource without having to know the exact type of the record in question.

Nested resources and/or namespaces are also supported, as illustrated in the example:

  polymorphic_url([:admin, @article, @comment])

results in:

  admin_article_comment_url(@article, @comment)

Usage within the framework

Polymorphic URL helpers are used in a number of places throughout the Rails framework:

  • url_for, so you can use it with a record as the argument, e.g. url_for(@article);
  • ActionView::Helpers::FormHelper uses polymorphic_path, so you can write form_for(@article) without having to specify :url parameter for the form action;
  • redirect_to (which, in fact, uses url_for) so you can write redirect_to(post) in your controllers;
  • ActionView::Helpers::AtomFeedHelper, so you don’t have to explicitly specify URLs for feed entries.

Prefixed polymorphic helpers

In addition to polymorphic_url and polymorphic_path methods, a number of prefixed helpers are available as a shorthand to :action => "..." in options. Those are:

  • edit_polymorphic_url, edit_polymorphic_path
  • new_polymorphic_url, new_polymorphic_path

Example usage:

  edit_polymorphic_path(@post)              # => "/posts/1/edit"
  polymorphic_path(@post, :format => :pdf)  # => "/posts/1.pdf"
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