Why does single `=` work in `if` statement?

Question

This code is provided as an example in for use with devise and OmniAuth, it works in my project.

class User < ActiveRecord::Base
  def self.new_with_sessi         


        

Answer 1

A assignment operator (=) returns the assigned value, which is then evaluated by the if. In ruby, only false and nil are considered as false. Everything else evaluates to true in a boolean context (like an if).