Trying to follow along with https://github.com/plataformatec/devise/wiki/OmniAuth:-Overview and I\'m stumped.
I\'ve got config.omniauth :facebook, ENV[\'FB_AP
Try setting omniauth_path_prefix in devise initializer (config/initializers/devise.rb) file.
For User class:
config.omniauth_path_prefix = "/users/auth"
For other class (e.g. when you use Account not User):
config.omniauth_path_prefix = "/accounts/auth"
Same thing with translated routes (my case). I've tranlated 'users' into 'blabla'. To have it working I had to set prefix to "/blabla/auth". (Works for only one locale!)