ruby-on-rails - 获取 PG::UndefinedFunction: ERROR in production

Question

我有一个类客户

class Customer < ActiveRecord::Base
  enum status: [:unconfirmed]

  default_scope { order updated_at: :desc }

  scope :unconfirmed, -> { where(status: 0) }
end

Schema 中的 Status 字段被定义为默认为 0 的整数。

在开发中，SQLite，一切正常，但在生产中，PostgresSQL，当我尝试运行 Customer.unconfirmed 时，我收到一个错误:

PG::UndefinedFunction: ERROR:  operator does not exist: boolean = integer
LINE 1: ...s".* FROM "customers"  WHERE "customers"."status" = 0  ORDER...
                                                             ^
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.
: SELECT "customers".* FROM "customers"  WHERE "customers"."status" = 0  ORDER BY "customers"."updated_at" DESC
ActiveRecord::StatementInvalid: PG::UndefinedFunction: ERROR:  operator does not exist: boolean = integer
LINE 1: ...s".* FROM "customers"  WHERE "customers"."status" = 0  ORDER...

谁能帮我看看这是怎么回事？

Answer 1

要使用枚举功能，您必须需要制作enum field as integer .但是根据您得到的异常，很明显您将字段 status 设置为 boolean。

您可以检查生产服务器中的列类型。以 rails c production 打开您的 Rails 控制台。然后 Customer.columns_hash['status'].type 查看列的类型。

将新迁移添加到 change the column type从 boolean 到 integer，然后应用迁移。 然后你可以这样做:

scope :unconfirmed, -> { where(status: :unconfirmed) }
#or
scope :unconfirmed, -> { where(status: 0) }