Question

I am using OAuth to a provider (LinkedIn).

I want to be able to pass parameters so that when someone signs-up, I can add some additional values at the time the new User is created (I am using Devise).

But how do I do that?

It looks like the link goes to the provider, which then makes a callback to my application. How can I pass parameters from that link?

Answer 1

The easy way to do this is to set the parameters in the session, then access them in the callback.

In your action that redirects to the provider:

session[:additional] = additional_data_hash

In the action that handles the callback from the provider:

data = session.delete(:additional)

Use delete to ensure your session remains small for subsequent requests.