I have this in routes.rb:
namespace :api do
namespace :v1 do
...
devise_for :users, constraints: { format: :json },
:controllers => { :omniaut
Guess I should convert my comments into an answer:
For our app we are doing the pure json api thing, with backbone/marionette. To get oAuth working with devise - I removed it from devise. :) Removed the omniauthable property I had set up and removed the omniauth settings from my initializers/devise.rb. Then reading on the omniauth page I implemented it by itself.
My api lives under "/api/v1"
Your implementation may vary, but the way I handle my oAuth accounts is put them in their own tables (Twitters, Facebooks, etc) and then link them into my devise user. This way I can have multiple accounts associated and the user can log in with any of them.
Also, be sure to set your twitter/facebook callback to something like:
http://127.0.0.1:3000/api/v1/auth/twitter/callback
to match your route in dev.
Hope this helps others. If I forgot a step or you get lost, please ask.