gem sqlite未加载到gemfile rails 4中

Question

我使用的是 rails 4 和 ruby​​ 2.0，但是当我在控制台中运行 rails s i 时，会出现如下错误：

/home/user/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.1/lib/active_record/connection_adapters/connection_specification.rb:58:in `rescue in resolve_hash_connection': Specified 'sqlite3' for database adapter, but the gem is not loaded. Add `gem 'sqlite3'` to your Gemfile. (Gem::LoadError)

为什么会出错？我已经将 gem 'sqlite3' 放入 gemfile 并运行 bundle install 但仍然出错，这是我的 gemfile：

ruby '2.0.0'

source 'https://rubygems.org'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.0.1'

# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.0'

# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'

# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails', '~> 4.0.0'

# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'

# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'

# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 1.2'

group :doc do
  # bundle exec rake doc:rails generates the API under doc/api.
  gem 'sdoc', require: false
end

gem 'devise'
gem "twitter-bootstrap-rails"
gem 'carrierwave'
# Use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.1.2'

# Use unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano', group: :development

group :development do
  # Use sqlite3 as the database for Active Record
  gem 'sqlite3'
end
# Use debugger
gem 'debugger', group: [:development, :test]
gem 'pg', group: [:production]

gem 'rails_12factor'

这是我的 database.yml ：

# SQLite version 3.x
#   gem install sqlite3
#
#   Ensure the SQLite 3 gem is defined in your Gemfile
#   gem 'sqlite3'
development:
  adapter: sqlite3
  database: db/development.sqlite3
  pool: 5
  timeout: 5000

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  adapter: sqlite3
  database: db/test.sqlite3
  pool: 5
  timeout: 5000

production:
  adapter: sqlite3
  database: db/production.sqlite3
  pool: 5
  timeout: 5000

如果我错了请告诉我？谢谢

Answer 1

尝试进入您的 gemfile.lock 文件并将 sqlite3 版本更改为sqlite3 (1.3.8)，然后重新捆绑安装/捆绑更新