Ruby DataMapper - 串行列產生空錯誤？

Question

在我構建的測試應用程序中將我的一些配置移動到數據庫中的過程中，遇到了一個非常奇怪的問題。每當我嘗試在表中創建新記錄時都會生成錯誤。該錯誤表明SQL查詢因ID列（模型中的DataMapper Serial）爲空而失敗。這個表的模式和用於創建新行的代碼在我所做的更改中未被修改。

sinatra.error 
#<DataObjects::IntegrityError: transactions.id may not be NULL (code: 19, sql state: , query: INSERT INTO "transactions" ("uuid", "oid", "store", "txndatetime", "chargetotal") VALUES ('...', '', '...', '...', '...') 

紅寶石語句來創建行：

txn = Transaction.create(:uuid => @uuid, :txndatetime => @timestr, :store => store, :chargetotal => params[:subtotal], :oid => params[:oid]) 

該表的模型：

class Transaction 
    include DataMapper::Resource 

    property :id,    Serial 
    property :uuid,   String, :key => true 
    property :oid,   String 
    property :store,   String 
    property :txndatetime, String 
    property :status,   String 
    property :refnumber,  String 
    property :chargetotal, String 
    property :response_hash, String, :length => 255 
    property :approval_code, String 
    property :tdate,   String 

    validates_presence_of :uuid, :store 
    validates_uniqueness_of :uuid 
end 

Answer 1

終於想通了。 DataMapper auto_upgrade！在sqlite數據庫中建立模式。丟棄表並重新生成它可以解決問題。

模式以前是這樣的：

CREATE TABLE `transactions` (`id` integer NOT NULL, `uuid` varchar(50) NOT NULL, `oid` varchar(50), `store` varchar(50), `txndatetime` varchar(50), `status` varchar(50), `refnumber` varchar(50), `chargetotal` varchar(50), `response_hash` varchar(255), `approval_code` varchar(50), `tdate` varchar(50), `cc_num` varchar(50), `cc_expm` varchar(50), `cc_expy` varchar(50), PRIMARY KEY (`id`, `uuid`)); 

現在看起來是這樣的：

CREATE TABLE "transactions" ("id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, "uuid" VARCHAR(50) NOT NULL, "oid" VARCHAR(50), "store" VARCHAR(50), "txndatetime" VARCHAR(50), "status" VARCHAR(50), "refnumber" VARCHAR(50), "chargetotal" VARCHAR(50), "response_hash" VARCHAR(255), "approval_code" VARCHAR(50), "tdate" VARCHAR(50), "cc_num" VARCHAR(50), "cc_expm" VARCHAR(50), "cc_expy" VARCHAR(50)); 

缺少AUTOINCREMENT似乎是罪魁禍首這裏。