This gem is compatible in rails4 having sqlite datatbase. With the help of this gem you can see the errors of your app in the better formate. :-)
INSTALLTION
First thing you need to do, is the installation , you can follow the below mentioned steps to install the gem inside your rails application.
gem install uhoh
Add this following line in your Gemfile and then run bundle install.
gem 'uhoh'
In routes of your application add the line.
mount Uhoh::Engine, at: "/controller_name"
After this run the migration of uhoh in your app.
rake uhoh:install:migrations
And then run migration of your own app.
rake db:migrate
We have used Google library to develop this Gem. So all credit goes to Google. :-)