Rails 4 - Gem::LoadError: Specified 'mysql2' for database adapter, but the gem is not loaded

Rails 4 - Gem::LoadError: Specified 'mysql2' for database adapter, but the gem is not loaded

ruby-on-rails ruby-on-rails-4 ruby-on-rails-4.1 mysql2 ruby-on-rails-4.2

ruby-on-rails

How to change the default binding ip of Rails 4.2 development server?

ruby-on-rails ruby-on-rails-4.2

ruby-on-rails

Add nullable foreign key in Rails

ruby-on-rails ruby ruby-on-rails-4 rails-activerecord ruby-on-rails-4.2

ruby-on-rails

Rails 4.2 Server port forwarding on Vagrant does not work

ruby-on-rails ruby-on-rails-4 vagrant ruby-on-rails-4.2

ruby-on-rails

can't connect localhost:3000 ruby on rails in vagrant

ruby-on-rails ruby ruby-on-rails-4 vagrant ruby-on-rails-4.2

ruby-on-rails

How can I get ActiveJob to enqueue jobs in Sidekiq on Heroku when called from the app (not the console)?

ruby-on-rails heroku sidekiq ruby-on-rails-4.2

ruby-on-rails

Rails: Share enum declaration values between models

ruby-on-rails rails-activerecord ruby-on-rails-4.2

ruby-on-rails

undefined method `cache' for nil:NilClass after upgrading to rails 4.2.5.1

ruby-on-rails ruby ruby-on-rails-4.2

ruby-on-rails

Change integer to float column table Rails

ruby-on-rails ruby-on-rails-4.2

ruby-on-rails

Rspec Using Development Database

ruby-on-rails rspec ruby-on-rails-4.2

ruby-on-rails

Rails 4.2 DEPRECATION WARNING: `serialized_attributes` is deprecated without replacement,

ruby-on-rails deprecation-warning ruby-on-rails-4.2

ruby-on-rails

Attribute saved in development but not in production

ruby-on-rails ruby-on-rails-4 activerecord ruby-on-rails-4.2 ruby-2.1.5

ruby-on-rails