undefined method `rewrite' for "":String
If you get this error, and the error message is pointing you to a “link_to” call or something similar, then you may be using an instance variable that’s called ‘@url’ too.
This blog post did talk about the problem but it seemed limited to models only. I finally discovered that, in my case, I was using ‘@url’ in the controller for the view where I was making the ‘link_to’ call.
Long story short, if you see this error, comb through your code (models, controllers and views) for any variables that are called ‘@url’ and change them.