Ruby on rails PG:：UndefinedColumn:错误：column"；oauth“在”中到期；“关系的定义”；“用户”；不存在（在Rails 5中）

尝试删除刚创建的列时出现以下错误

PG:：UndefinedColumn:错误：关系的“oauth\u expires\u in”列 “用户”不存在

这是我的第一个迁移文件

20170709013540_add_oauth_expires_in_to_users.rb
class AddOauthExpiresInToUsers < ActiveRecord::Migration[5.0]
  def change
    add_column :users, :oauth_expires_in, :integer
  end
end

然后我创建了一个新的迁移文件来删除我创建的列。见下文：

20170709111539_remove_oauth_expires_in_from_users.rb
class RemoveOauthExpiresInFromUsers < ActiveRecord::Migration[5.0]
  def change
    remove_column :users, :oauth_expires_in, :integer
  end
end

20170709111539\u从\u users.rb中删除\u oauth\u expires\u in\u
类从用户中移除OAuthexpiresInUsers

当我运行迁移时，会出现以下错误：

== 20170709111539 RemoveOauthExpiresInFromUsers: migrating ====================
-- remove_column(:users, :oauth_expires_in, :integer)
rails aborted!
StandardError: An error has occurred, this and all later migrations canceled:

PG::UndefinedColumn: ERROR:  column "oauth_expires_in" of relation "users" does not exist
: ALTER TABLE "users" DROP "oauth_expires_in"
/Users/davidverbustel/code/davidverbustel/barky/db/migrate/20170709111539_remove_oauth_exp    ires_in_from_users.rb:3:in `change'
./bin/rails:4:in `require'
./bin/rails:4:in `<main>'
ActiveRecord::StatementInvalid: PG::UndefinedColumn: ERROR:  column "oauth_expires_in" of     relation "users" does not exist
: ALTER TABLE "users" DROP "oauth_expires_in"
/Users/davidverbustel/code/davidverbustel/barky/db/migrate/20170709111539_remove_oauth_exp    ires_in_from_users.rb:3:in `change'
./bin/rails:4:in `require'
./bin/rails:4:in `<main>'
PG::UndefinedColumn: ERROR:  column "oauth_expires_in" of relation "users" does not exist
/Users/davidverbustel/code/davidverbustel/barky/db/migrate/20170709111539_remove_oauth_exp    ires_in_from_users.rb:3:in `change'
./bin/rails:4:in `require'
./bin/rails:4:in `<main>'
Tasks: TOP => db:migrate

==20170709111539从用户处移除OAuthexpiresInUsers:迁移====================
--删除列（：users，：oauth\u expires\u in，：integer）
rails中止了！
StandardError:发生错误，此迁移和所有后续迁移已取消：
PG:：UndefinedColumn:错误：关系“users”的“oauth\u expires\u in”列不存在
：ALTER TABLE“users”DROP“oauth\u expires\u in”
/Users/davidverbustel/code/davidverbustel/barky/db/migrate/20170709111539\u从用户中删除oauth\u exp ires\u。rb:3:in“更改”
/bin/rails:4:in'require'
/bin/rails:4:in`'
ActiveRecord:：StatementInvalid:PG:：UndefinedColumn:错误：关系“users”的“oauth\u expires\u”列不存在
：ALTER TABLE“users”DROP“oauth\u expires\u in”
/Users/davidverbustel/code/davidverbustel/barky/db/migrate/20170709111539\u从用户中删除oauth\u exp ires\u。rb:3:in“更改”
/bin/rails:4:in'require'
/bin/rails:4:in`'
PG:：UndefinedColumn:错误：关系“users”的“oauth\u expires\u in”列不存在
/Users/davidverbustel/code/davidverbustel/barky/db/migrate/20170709111539\u从用户中删除oauth\u exp ires\u。rb:3:in“更改”
/bin/rails:4:in'require'
/bin/rails:4:in`'
任务：TOP=>db:migrate

我挠头已经有一段时间了，但是我看不出这个错误

任何想法都将不胜感激。

---

谢谢

*为我工作（tm）。Rails的确切版本是什么？*您是否已检查该列是否已实际添加到数据库？*删除*时不需要指定类型（：integer），生成的语句不应该是“ALTER TABLE users DROP COLUMN oauth_expires_in”？就像@pascalbetz所说的那样，首先检查是否添加了它。另外，希望您没有通过psql或pgadmin或类似的方式手动从表中删除该列。我使用的是rails 5.0。感谢使用rails数据库控制台@pascalbetz的提示，我可以看到该列丢失了，但是通过rails控制台，我可以创建一个属性为“oauth_expires_in”的用户。两者之间有什么不同？我可以通过删除迁移文件并删除schema.rb中的行来强制执行整个操作吗？您还可以执行

rake db:migrate:status

并查看所讨论的迁移是否首先成功运行。您的迁移似乎不同步？你能删除/重新创建整个数据库吗？当您退出Rails控制台并启动一个新控制台时会发生什么？

== 20170709111539 RemoveOauthExpiresInFromUsers: migrating ====================
-- remove_column(:users, :oauth_expires_in, :integer)
rails aborted!
StandardError: An error has occurred, this and all later migrations canceled:

PG::UndefinedColumn: ERROR:  column "oauth_expires_in" of relation "users" does not exist
: ALTER TABLE "users" DROP "oauth_expires_in"
/Users/davidverbustel/code/davidverbustel/barky/db/migrate/20170709111539_remove_oauth_exp    ires_in_from_users.rb:3:in `change'
./bin/rails:4:in `require'
./bin/rails:4:in `<main>'
ActiveRecord::StatementInvalid: PG::UndefinedColumn: ERROR:  column "oauth_expires_in" of     relation "users" does not exist
: ALTER TABLE "users" DROP "oauth_expires_in"
/Users/davidverbustel/code/davidverbustel/barky/db/migrate/20170709111539_remove_oauth_exp    ires_in_from_users.rb:3:in `change'
./bin/rails:4:in `require'
./bin/rails:4:in `<main>'
PG::UndefinedColumn: ERROR:  column "oauth_expires_in" of relation "users" does not exist
/Users/davidverbustel/code/davidverbustel/barky/db/migrate/20170709111539_remove_oauth_exp    ires_in_from_users.rb:3:in `change'
./bin/rails:4:in `require'
./bin/rails:4:in `<main>'
Tasks: TOP => db:migrate