Why am I getting “Unable to autoload constant” with Rails and grape?

Question

I want to do an API for an Android app. When searching, I found {grape}. I\'m following this tutorial, but I have a problem launching the Rails server:

=> Boo         


        

Answer 1

Try either

• Moving your API code's files from app/api to app/api/api, or

• Moving your API classes outside the API module (i.e. deleting all the module API lines and their corresponding end statements).

From Grape's documentation:

Place API files into app/api. Rails expects a subdirectory that matches the name of the Ruby module and a file name that matches the name of the class. In our example, the file name location and directory for Twitter::API should be app/api/twitter/api.rb.

Thus the correct location for your API::Root class would actually be app/api/api/root.rb.

With this change your code starts and works fine for me on Rails 4.0.2.