Rails provides a rather powerful polymorphic_path method in the views. When working with a heterogenous collection of objects in the view, you can use polymorphic_path to generate a URL to the correct resource (as defined as a resource in your routes). It introduces some potentially gnarly issues, especially if you create generalized controllers.
The recent refactoring blog post at Thoughtbot shows the before and after state of the code. The draw attention to various patterns that were used as well as the pros and cons of the refactor. In particular, I find the following quote very emblematic of both what was done as well as where things need to go in Curate.
In summary, using the new code is easier, but understanding the details may be harder. Although each piece is less complex, the big picture is more complex.
Please take some time to go and read the post. And while you are at it, add Thoughtbot’s blog to your RSS Reader.