獲得PG :: UndefinedFunction：ERROR生產

Question

我

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

    default_scope { order updated_at: :desc } 

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

在架構狀態字段定義爲整數，默認爲0

在發展中，SQLite的一類客戶，一切工作正常但在生產，PostgreSQL的，當我嘗試運行Customer.unconfirmed我得到一個錯誤：

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... 

誰能幫我找出這裏發生了什麼？

Answer 1

要使用enum功能，您需要必須使enum field as integer。但根據您得到的例外情況，很明顯，您已將字段status設置爲布爾值。

您可以檢查生產服務器中的列類型。以rails c production打開您的導軌控制檯。然後Customer.columns_hash['status'].type查看列的類型。

從布爾到整數添加一個新的遷移change the column type，然後應用遷移。 那麼你可以做：

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