Rails : render and exit immediately

Question

Using the omniauth gem, I am forced to define a single route callback for succesful logins, regardless of the provider :

def auth_callback 

        auth_data =          


        

Answer 1

Why not specifically call render in those methods?

def process_one
 # do something then render view for process_one
 render :process_one and return
end

Rails should detect that you've already run it and not try to render again.

Answer 2

If you want to return from the chain of methods, e.g.

def a
  ...
  b
  ...
  render "smth"
end
...
def b
  ...
  # render from some conditional from here
  ...
end

will cause AbstractController::DoubleRenderError, which means that you call render twice.

You can read this article to find out 4 ways to manage such situation.