mysql - rake 数据库 :migrate got rake aborted

Question

我通过演示学习 Rails，原始的database.yml是

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

所以这个演示使用sqlite作为数据库，但我想更改为mysql，所以我将database.yml更改为:

adapter: mysql2
database: jobs_test
server: localhost
username: root
password: "1234"
pool: 5
timeout: 5000
encoding: utf8

当我运行时

rake db:migrate

然后我得到了错误:

rake aborted!
Please install the sqlite3 adapter: `gem install activerecord-sqlite3-adapter`  
(sqlite3 is not part of the bundle. Add it to Gemfile.)

所以，我已经将适配器更改为mysql2，为什么它让我安装sqlite3适配器？

Answer 1

确保您的database.yml与嵌套在development:下的配置值正确缩进，如下所示:

development:
  adapter: mysql2
  database: jobs_test
  server: localhost
  username: root
  password: "1234"
  pool: 5
  timeout: 5000
  encoding: utf8

您原来的示例没有显示正确的缩进。

当然，如果您还没有这样做，请务必添加:

gem 'mysql2'

到 Gemfile 并运行:

bundle install
rake db:migrate