Rails Devise Gem init

Question

I've successfull launched this command for install devise

rails generate devise:install

Now I have to launch

rails generate devise user 

but console tell me:

/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 I have:

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

Any ideas?

Answer 1

对于Rails 4.2.3，请尝试：

gem 'mysql2', '~> 0.3.18'