Authenticate With Username or Email

Today I learned a way to implement a login form that accepts email or username as the login. I've been on the other side of a form like this many times, but had never written one myself.

Here's one solution, with ActiveRecord:

User.where('username = ? or email = ?', "jwworth", "jake@example.com")

title or slug are represented by the same parameter, and either can be nil.

login = params.fetch('username_or_email')
User.where('username = ? or email = ?', login, login)