用于计数多于一列的行的 Sequelize 查询

如何解决用于计数多于一列的行的 Sequelize 查询

     await   expense.model.findAll({
  attributes: { 
    include: [[instance.sequelize.fn("COUNT",instance.sequelize.col('expense_category')),"expenseCount"]],},where:[{uuid: user.uuid,expense_category: "Home"}]
  }).then(data => {
  res.send(data)
})

相当于

select COUNT(expense_category) as expenseCountfrom customers where expense_category= "Home" AND uuid = user.uuid

问题是，由于我要使用 Chart.js 的计数，我需要再次查询，因为我还有另外 3 个 expense_category，它们分别是：Miscellaneous、{{1 }}，Food and Beverage。有没有一种方法可以让我上面的代码更高效，这样我就不必每个 Transportation 单独查询？

解决方法

我假设您已将枚举用于类别。您可以使用 findall 中的组并删除 where 子句中费用类别的其他条件，例如：

    await   expense.model.findAll({
  where:{uuid: user.uuid},group:['expense_category'],attributes: { 
    'expense_category'
    [instance.sequelize.fn("COUNT",instance.sequelize.col('expense_category')),"expenseCount"]  
  }
  }).then(data => {
  res.send(data)
})

你会得到类似的回复

[
 {
   'expense_catogory':"Home",'expenseCount': 10
 },{
   'expense_catogory':"Miscellaneous",'expenseCount': 2
 },{
   'expense_catogory':"Food and Beverage",'expenseCount': 7
 },{
   'expense_catogory':"Transportation",'expenseCount': 3
 }
]