Omniauth with google_ oauth2 on rails

what if you could set up your account with a third party logging? when I first heard this I was so excited to get started and use this gem. Omiauth gem is awesome!. but when I actually started implementing it on my project was completely lost and gave me a bunch of errors.one of the errors was URI's not matching and the other one was missing current_id. follow me step by step to get this done the right way and smoothly continue with your project.