ruby-on-rails - 无法加载 'active_record/connection_adapters/sqlite3_adapter'

Question

我正在尝试在我的笔记本电脑(Debian Wheezy 64 位)上安装 ROR。

首先，我通过第一个答案解决了这个问题 ( enter link description here)。

现在 rails 服务器启动了，但是在 localhost:3000 的浏览器上浏览时出现以下错误:

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.

我已经安装了ruby 2.0.0编译源码，没有报错，没有错误。然后我安装了一些需要的库(sqlite3、libsqlite3-dev)...

这是我的 GemFile:

'https://rubygems.org'

-# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.0.0'

-# Use sqlite3 as the database for Active Record
gem 'sqlite3'

-# 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

-# Use ActiveModel has_secure_password
-# gem 'bcrypt-ruby', '~> 3.0.0'

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

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

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

gem 'execjs'
gem 'therubyracer'

在我的 database.yml 中:

-# 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

我的 gem 版本:

ruby 2.0.0
rails 4.0.0
sqlite 1.3.7

Answer 1

今天在运行 rake db:create_migration 时在 Sinatra 中遇到了这个错误。我的错误是在 app.rb 中错误地指定了一个“sqlite:”数据库类型，而它应该是“sqlite 3 :”。示例:

错误:

set :database, 'sqlite:name.db'

正确:

set :database, 'sqlite3:name.db'