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Right now if you try to use a route that you have defined in your `omniauth_callbacks` but you have not declared that resource to be `omniauthable` you will get a weird route missing error which causes the user to look in the routes for the fix:
```ruby
devise_for :users, controllers: {omniauth_callbacks: "users/omniauth_callbacks"}
```
This PR checks to see if the mapping of `:user` has the module `omniauthable` included in it when `omniauth_callbacks` is specified in the route. If it does not, an instructional error is raised:
```
Mapping omniauth_callbacks on a resource that is not omniauthable
Please add `devise :omniauthable` to the `User` model
```