I am a beginner to Ruby On Rails want to implement facebook and google+ login with devise gem.Application work fine loaclly but when deploy to heroku gives an error Error: redirect_uri_mismatch
You should really ask for a more specific question regarding any code. This is too general! Every gem that respect himself has decent documentation for it's use. usually github (it's repository) starts with a really good README file and from than start exploring the tool you're working with. i.g: https://github.com/plataformatec/devise