Sql Sequelize-在不同条件下对同一关联进行两次计数
我试图根据不同的参数获取关联表中的两个记录计数:Sql Sequelize-在不同条件下对同一关联进行两次计数,sql,count,associations,sequelize.js,Sql,Count,Associations,Sequelize.js,我试图根据不同的参数获取关联表中的两个记录计数: // Models var Customer = sequelize.define('Customer', { name: DataTypes.STRING, }); var Invoice = sequelize.define('Invoice', { invoiceRef: DataTypes.STRING, status: { type: DataTypes.ENUM, values:
// Models
var Customer = sequelize.define('Customer', {
name: DataTypes.STRING,
});
var Invoice = sequelize.define('Invoice', {
invoiceRef: DataTypes.STRING,
status: {
type: DataTypes.ENUM,
values: ['UNPAID', 'PAID'],
defaultValue: 'UNPAID'
},
isArchived: {
type: DataTypes.BOOLEAN,
defaultValue: false
},
});
Invoice.associate = function(models) {
Invoice.belongsTo(models.Customer);
}
Customer.associate = function (models) {
Customer.hasMany(models.Invoice);
}
// Query
Customer.findAll({
attributes: {
include: [
[models.Sequelize.fn("COUNT", models.Sequelize.fn("DISTINCT", models.Sequelize.col("Invoices.id"))), "totalInvoices"],
[models.Sequelize.fn("COUNT", models.Sequelize.fn("DISTINCT", models.Sequelize.col("UnpaidInvoices.id"))), "unpaidInvoices"]
]
},
include: [
{
model: models.Invoice,
where: { isArchived: false },
attributes: [],
required: false
},
{
model: models.Invoice,
where: { isArchived: false, status: 'UNPAID' },
attributes: [],
required: false
},
],
group: ['Customer.id']
})
问题在于,当多次包含相同的关联表时,Sequelize会在SQL查询中为表的两个实例指定相同的名称:
在Customer
id
=Invoices
和Invoices
客户id和Invoices
已存档=0
在客户id
=发票和客户id
和发票被归档<0和发票
状态
=“未付款”
有没有办法为查询中的联接表指定不同的名称?例如:
在Customer
id
=Invoices
和Invoices
客户id
和Invoices
已存档=0
在客户id
=发票和客户id
和发票已存档和发票<0和发票状态未付款
我通常只连接一次,然后使用带有SUM
的CASE
语句,而不是使用COUNT
——所有行都连接在一起,这就是为什么两个行都相同的原因
attributes: {
include: [
// count paid using case/sum via `status` != 'UNPAID'
[ sequelize.fn('sum', sequelize.literal("CASE WHEN (`Invoices`.`status` != 'UNPAID' THEN 1 ELSE 0 END")), 'paid_count' ],
// count unpaid using case/sum via `status` = 'UNPAID'
[ sequelize.fn('sum', sequelize.literal("CASE WHEN (`Invoices`.`status` = 'UNPAID' THEN 1 ELSE 0 END")), 'unpaid_count' ],
],
// ...
},