Rails迁移给我一个错误

Question

我正在尝试创建一个create_posts迁移。

但是我收到了这个错误。

== 20140528222521 CreatePosts: migrating ======================================
-- create_table(:posts)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

SQLite3::SQLException: table posts has no column named description: CREATE  INDEX "index_posts_on_description" ON "posts" ("description")/Users/Hyunsoo/.rvm/gems/ruby-2.1.1/gems/sqlite3-1.3.9/lib/sqlite3/database.rb:91:in `initialize'

有人知道如何解决这个问题吗？感谢。

Answer 1

看起来你忘了在description的迁移中添加CreatePosts字段但是你在正在导致错误的那个不存在的字段上添加索引。

您需要做的是在迁移中添加description字段，如下所示：

class CreatePosts < ActiveRecord::Migration
  def change
    create_table :posts do |t|
      ### ...
      t.string :description  ## <== Add this
      ### ...
    end
  end
end