How to correctly install MySQL Ruby Gem
gem install mysql

gem 'mysql'

bundle install

development:
  adapter: mysql
  database: name_of_your_database
  encoding: utf8
  host: localhost
  username: root (replace with the actual username)
  password: root (replace with the actual password)

user = User.find(id)

rvm gemset create appname && rvm gemset use appname

bundle install