ruby-on-rails - 无法启动 Rails 服务器 - sqlite3 适配器错误

Question

我正在尝试自学 ruby​​ on rails，并尝试创建一个简单的应用程序作为开始。我正在学习 http://guides.rubyonrails.org/getting_started.html#creating-a-new-rails-project 上的教程但我很难启动服务器。当我尝试启动服务器并转到本地主机时，

Could not load 'active_record/connection_adapters/sqlite3_adapter'. Make sure that the adapter in
config/database.yml is valid. If you use an adapter other than 'mysql', 'mysql2', 'postgresql' or
'sqlite3' add the necessary adapter gem to the Gemfile.

我试图查找在其他问题上发生这种情况的解决方案/原因，但无济于事。

我的 Gemfile 看起来像这样

source 'https://rubygems.org'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.1.6'
# Use sqlite3 as the database for Active Record
gem 'sqlite3'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.3'
# 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', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0',          group: :doc

# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

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

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

# Use debugger
# gem 'debugger', group: [:development, :test]

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin]

我正在使用 ruby 2.1.3

当我输入时

gem list

我发现我正在运行 rails 4.1.6sqlite3 (1.3.9 x86-mingw32)

谁能指出我正确的方向？

Answer 1

确保您的 config/database.yml 具有适合当前环境的数据库驱动程序集:

development:
  adapter: sqlite3 # check if you have sqlite3 here
  encoding: ...
  database: ...
  pool: ...
  username: ...
  password: ...

另外不要忘记为您想要在其中使用 sqlite3 的所有其他环境设置它。