Rails Devise Gem init

Question

Ich habe erfolgreich diesen Befehl gestartet für

rails generate devise:install 

Jetzt entwickeln installiere ich

rails generate devise user 

aber Konsole sagen Sie mir starten haben:

/Users/hele/.rvm/gems/ruby-2.2.2/gems/activerecord-4.2.3/lib/active_record/connection_adapters/connection_specification.rb:177:in rescue in spec: Specified mysql2 for database adapter, but the gem is not loaded. Add gem 'mysql2' to your Gemfile (and ensure its version is at the minimum required by ActiveRecord). (Gem::LoadError) 

In GemFile Ich habe:

source 'https://rubygems.org' 
gem 'rails' , '4.2.3' 
gem 'devise', '4.1.1' 
gem 'mysql2' 
gem 'bootstrap-sass', '~> 3.3.6' 
gem 'font-awesome-rails', '4.3.0.0' 
gem 'sqlite3' 
gem 'sass-rails', '~> 5.0.4' 
gem 'uglifier', '>= 1.3.0' 
gem 'coffee-rails', '~> 4.0.0' 
gem 'turbolinks' 
gem 'jbuilder', '~> 1.2' 
group :doc do 
    gem 'sdoc', require: false 
end 

Irgendwelche Ideen?

Answer 1

Für Rails 4.2.3, geben einen Versuch:

gem 'mysql2', '~> 0.3.18'