happy_seed:omniauth generator depends upon
This lets you easily add oauth authentication for 3rd party sites to your application; the main ones being facebook and twitter. This sets up the infrastructure to make everything work with devise.
The Identity model is used to link up the user with the remote information. What information is given is stored, though you could go deeper with this. Additionally, the access token for the user is store in the Identity model for interacting with the remote service on behalf of the user.
It also creates the omniauth_callback controller. Devise as it's setup out of the box has the user's email address as the login, but not all services will give you the user's email address. (Twitter for example.) The controller in this case will check only set the email address if one is returned.
It also creates a registration controller to allow a user to set an email. If the user hasn't set a password, they can change email without it. If they set an password, then it is required to change things in the future. This is done using conditional validators rather than a seperate model for the user.
Documented in spec/features/registration_spec.rb
Set up a $HOME/.seed_defaults file which contains development application keys. These will be copied over initially so that you don't need to enter them in all the time.
This is a base module which is used by
happy_seed:instagram and more.