Fix 'wrong constant name' error (Rails 4.1.0beta1)

[jtomaszewski]

I keep having 'NameError: wrong constant name' wherever I use any kind of expose in my controllers in Rails 4.1 (was working great in 4.0).

So I digged a little and the reason is that:

path # => "CarsController"
path[0...(path.rindex('::') || 0)] # => "" (empty string)
"".constantize # (rails 4.0) => Object 
"".constantize # (rails 4.1) => NameError: wrong constant name

Here is a small change that fixes that. P.S. maintainers of mongoid gem had similar problem.

[emaiax]

When is this gonna be merged? Thanks!

[jgdavey]

Merged: f9f4db1cf09edf32b5187c2710b56f41f14023e3