I am using Devise for authentication, and when someone visits a specific URL (with specific params in the URL), I would like to set the 'current_user' to a specific value from the db.

How do I do that ?

Also, will I have to make sure all the validation requirements are satisfied ? E.g., my user model has:

validates_presence_of :username, :email

If I set the current_user, would I have to set both the :username & :email, or can I just do one or the other ?

ruby-on-rails-3 devise
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