續集和2連接表，麻煩

Question

我們遇到了問題。我們無法使用sequelize在以下結構中執行SQL SELECT。

這是我們的結構，見下圖。

我們正在努力執行該sequelize查詢：

query = { 
    'attributes': [models.sequelize.fn('count', models.sequelize.col('sent_deals.user_id'))], 


    order: [['alert.keywords', ' DESC']], 
    attributes: ['alert.keywords'], 
    include: [ 
     { 
      model: models.alert, 
      attributes: ['keywords'] 
     }, { 
      where: { 
       'products.sent_deal.created_at': { 
        between: [moment(start).startOf('day').format('YYYY-MM-DD HH:mm'), moment(end).endOf('day').format('YYYY-MM-DD HH:mm')] 
       } 
      }, 
      model: models.product, 
      attributes: ['id'] 
     } 
    ] 
}; 



models.userAlerts.findAll(query) 

但後來我們收到以下錯誤："error: missing FROM-clause entry for table "alert""，因爲我們試圖選擇還外include[]屬性alert.keywords，但是它仍然在Sequelize JS的早期版本中工作！現在我們不能再通過警報來命令了...... :(它總是返回一個警報，因爲「屬於」連接，所以理論上它必須工作。

我的猜測是因爲查詢沒有執行直接加入，但在一個子查詢做了SELECT FROM，見下圖：

SELECT "userAlerts".* 
    ,"alert"."id" AS "alert.id" 
    ,"alert"."keywords" AS "alert.keywords" 
    ,"products"."id" AS "products.id" 
    ,"products.sent_deal"."user_alert_id" AS "products.sent_deal.user_alert_id" 
    ,"products.sent_deal"."deal_id" AS "products.sent_deal.deal_id" 
    ,"products.sent_deal"."created_at" AS "products.sent_deal.created_at" 
FROM (
    SELECT "userAlerts"."id" 
     ,"userAlerts"."user_id" 
     ,"userAlerts"."alert_id" 
     ,"userAlerts"."activationToken" 
     ,"userAlerts"."activatedAt" 
     ,"userAlerts"."createdAt" 
     ,"userAlerts"."updatedAt" 
    FROM "user_alerts" AS "userAlerts" 
    WHERE (
      SELECT "products.sent_deal"."user_alert_id" 
      FROM "sent_deals" AS "products.sent_deal" 
      INNER JOIN "deals" AS "products" ON "products"."id" = "products.sent_deal"."deal_id" 
      WHERE "userAlerts"."id" = "products.sent_deal"."user_alert_id" 
       AND (
        "products.sent_deal"."created_at" BETWEEN '2014-11-17 00:00' 
         AND '2014-12-02 23:59' 
        ) LIMIT 1 
      ) IS NOT NULL 
    ORDER BY "alert"."keywords" DESC LIMIT 1 
    ) AS "userAlerts" 
LEFT JOIN "alerts" AS "alert" ON "alert"."id" = "userAlerts"."alert_id" 
INNER JOIN (
    "sent_deals" AS "products.sent_deal" INNER JOIN "deals" AS "products" ON "products"."id" = "products.sent_deal"."deal_id" 
    ) ON "userAlerts"."id" = "products.sent_deal"."user_alert_id" 
    AND (
     "products.sent_deal"."created_at" BETWEEN '2014-11-17 00:00' 
      AND '2014-12-02 23:59' 
     ) 
ORDER BY "alert"."keywords" DESC 

Answer 1

擁有對包括keywords屬性，應該是足夠了，沒有必要將它添加到外部查詢

attributes: [models.sequelize.fn('count', models.sequelize.col('sent_deals.user_id'))], 


order: [['alert.keywords', ' DESC']], 
attributes: ['alert.keywords'], <-- This line is superflous 
include: [ 
    { 
     model: models.alert, 
     attributes: ['keywords'] 
    }, { 
     where: { 
      'products.sent_deal.created_at': { 
       between: [moment(start).startOf('day').format('YYYY-MM-DD HH:mm'), moment(end).endOf('day').format('YYYY-MM-DD HH:mm')] 
      } 
     }, 
     model: models.product, 
     attributes: ['id'] 
    } 
] 

您是否應該包含SentDeal以查詢產品ucts.sent_deal？這個問題可能是更好的問題上的續集GH