Question

所以我需要生成一些仪表板，大多数这些仪表板依赖MySQL中的求和查询来工作。

这是模型中的rails查询：

def self.search_three(dyear)
    find_by_sql("SELECT quantity, model,
SUM(IF(status = 'Completed',quantity,0)) AS Comp,
SUM(IF(status = 'Shipped',quantity,0)) AS Ship,
SUM(IF(status = 'Cart Submitted',quantity,0)) AS CS,
SUM(quantity) AS total
FROM orders
WHERE YEAR(needby) = '#{dyear}'
GROUP BY model")
  end

它可以工作，但问题是rails控制台中的输出不是我期望进入仪表板的。

[＃，＃，＃]如果我将rabar（来自其他地方的输入）指定给2015，则输出。

但是，当我这样做时，在MySQL工作台中：

SELECT quantity,
SUM(IF(status = 'Completed',quantity,0)) AS Comp,
SUM(IF(status = 'Shipped',quantity,0)) AS Ship,
SUM(IF(status = 'Cart Submitted',quantity,0)) AS CS,
SUM(quantity) AS total
FROM orders
WHERE YEAR(needby) = '2015'
GROUP BY model

我得到了

{| ！数量|| ！Comp ||！发货|| ！CS || ！总 | - | 40 || 8810 || 0 || 1081 || 19181 ||连接器 | - | 118 || 318 || 0 || 0 || 955 ||欧盟绳索 | - | 256 || 548 || 0 || 0 || 3944 ||美国绳索 |}

我需要显示的图表是总列和图表显示的是上述错误数量。

如何让rails查询使用输出的AS总数而不仅仅是第一列？

Answer 1

好的，我非常接近;

def self.search_three(dyear)
    find_by_sql("SELECT model,
SUM(IF(status = 'Completed',quantity,0)) AS Comp,
SUM(IF(status = 'Shipped',quantity,0)) AS Ship,
SUM(IF(status = 'Cart Submitted',quantity,0)) AS CS,
SUM(quantity) AS quantity
FROM orders
WHERE YEAR(needby) = '#{dyear}'
GROUP BY model")
  end

这主要是给了我预期的输出;虽然它确实显示以下内容：

[#<Order id: nil, quantity: 19181, model: "Connector">, #<Order id: nil, quantity: 955, model: "EU Cords">, #<Order id: nil, quantity: 3944, model: "US Cords">]

我认为订单ID部分可能存在于chartkick中，但这可能是后来的另一篇文章。

Rails Activerecord + MySQL查询没有给出我期望的结果

1 个答案: