Rails - 增加字段

给post表增加一个test字段，test字段类型为string

D:\Ruby\projects\blog>rails generate migration add_test_to_post test:string
      invoke  active_record
      create    db/migrate/20130410145129_add_test_to_post.rb

D:\Ruby\projects\blog>rake db:migrate
==  AddTestToPost: migrating ==================================================
-- add_column(:posts, :test, :string)
   -> 0.0100s
==  AddTestToPost: migrated (0.0100s) =========================================

erb文件添加字段

  <div class="field">
    <%= f.label :test %><br />
    <%= f.text_field :test %>
  </div>

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一次添加多个字段，比如我打算向Article中增加x和y字段，这个字段是string类型。可以写下面这样，（自然的像写英语）

rails generate migration add_x_and_y_to_articles x:string y:string

rake db:migrate