您最多选择25个主题 主题必须以字母或数字开头,可以包含连字符 (-),并且长度不得超过35个字符

20150113213955_add_email_addresses_user_id_index.rb 188B

123456789
  1. class AddEmailAddressesUserIdIndex < ActiveRecord::Migration[4.2]
  2. def up
  3. add_index :email_addresses, :user_id
  4. end
  5. def down
  6. remove_index :email_addresses, :user_id
  7. end
  8. end