Question

我正在尝试重命名模式中确实存在的列，并且所有信息都在那里，但是当我去更新它时，它会给我一个＆＃34;缺少的列＆＃34 ;错误，我无法弄清楚为什么？有什么想法吗？

迁移：

class ChangeColumnName < ActiveRecord::Migration
  def change
    rename_column :postcodes, :type, :zip_type
  end
end

schema.rb

  create_table "postcodes", force: true do |t|
     t.string   "postalcode"
     t.string   "type"
     t.string   "primary_city"
     t.string   "state"
     t.string   "county"
     t.string   "timezone"
     t.string   "area_code"
     t.string   "latitude"
     t.string   "longitude"
     t.string   "estimated_population"
     t.datetime "created_at"
     t.datetime "updated_at"
   end

错误：

DL is deprecated, please use Fiddle
DL is deprecated, please use Fiddle
== 20150304172437 ChangeColumnName: migrating =================================
-- rename_column(:postcodes, :type, :zip_type)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

Missing column postcodes.typeC:/Users/Steve    Q/Documents/GitHub/project1/db/migrate/20150304172437_change_column_name.rb:3:in `change'C:in `migrate' ActiveRecord::ActiveRecordError: Missing column postcodes.type

Answer 1

我已尝试将type列重命名为zip_type。你可以共享表创建迁移吗？另一种解决方案是，您可以删除type列，并将新列添加为zip_type。

Rails迁移缺失列

1 个答案: