[Rails] Redirecting without Plugins

I want to be redirected to the current page, after having logged in. I
searched google and only saw ways to do this using certain plugins like
devise.

Isn't there a simple Way to implement this path?

I start out with

def store_location
session[:return_to] = request.fullpath
end

and I think the only thing left is passing this path to my redirect_ to
code Line in the Sessions Controller, but "redirect_to store_location"
won't work.

If only Plugins will help, can I use Devise without deleting or
recreating my current User Model?

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