我使用sequelize进行过滤。
我目前的表结构:
我想过滤Table3和Table4,考虑到我只能使用顶级where子句过滤Table2。
我填写我的where条件的方法就是使用基础对象:
var Table2id = parseInt(req.query.Table2id) || null,
Table3id = parseInt(req.query.Table3id) || null,
Table4id = parseInt(req.query.Table4id) || null,
whereCondition = { deleted: 0 }
if (Table2id) { whereCondition['table2id'] = Table2id }
if (Table3id) { whereCondition['table3id'] = Table3id }
if (Table4id) { whereCondition['table4id'] = Table4id }
Table1.findAndCountAll({
limit: limit,
offset: offset,
order: 'created_at DESC',
where: whereCondition,
include: [
{
model: User,
}, {
model: Item,
include: [
{
model: Image
}
]
}, {
model: Table2,
include: [
{
model: Table3,
include: [
{
model: Table4,
}
]
}
]
}
],
}).then(function (results) { res.json(results) })
我尝试使用我发现的一些黑客,如whereCondition['$Table3.table3id$'] = Table3id
,但无济于事。
如何过滤嵌套包含?有没有其他方法可以构建查询,所以我不必拥有嵌套包含,但仍然保留这个数据结构(有没有比我想到的更好的结构方式)?< / p>
编辑:所以我希望能够对包含的表进行排序,并在顶级where子句中至少设置一个参数(如deleted = 0)。
我尝试按如下方式修改查询:
var Table2id = parseInt(req.query.Table2id) || null,
Table3id = parseInt(req.query.Table3id) || null,
Table4id = parseInt(req.query.Table4id) || null,
whereCondition = { deleted: 0 },
extraWhereCondition = {}
if (Table2id) { whereCondition['table2id'] = Table2id } // figured this can be left alone in this particular case (as it works in top-level where clause)
if (Table3id) { extraWhereCondition['table3id'] = Table3id }
if (Table4id) { extraWhereCondition['table4id'] = Table4id }
Table1.findAndCountAll({
limit: limit,
offset: offset,
order: 'created_at DESC',
where: whereCondition,
include: [
{
model: User,
}, {
model: Item,
include: [
{
model: Image
}
]
}, {
model: Table2,
include: [
{
model: Table3,
where: extraWhereCondition,
include: [
{
model: Table4,
where: extraWhereCondition,
}
]
}
]
}
],
}).then(function (results) { res.json(results) })
但这会给我一个错误,即Table2.Table3.Table4.table4id在字段列表中是未知的。
答案 0 :(得分:7)
您只需要放置where
的方式,您也可以创建选项对象,然后将其传递到您需要的地方
where condition
放入include
required true and false
更改joing规则当使用include.where过滤预先加载的模型时 include.required隐式设置为true。这意味着内心 join完成返回父模型与任何匹配的子项。
sequelize称之为eager-loading
,请访问以获取更多详细信息eager-loading
var Table2=require('../models/').table2;//and other model that u need
var option={limit: limit,
offset: offset,
order: 'created_at DESC',
where:{ deleted: 0 }
include: [
{
model: User,
}, {
model: Item,required: true,
include: [
{
model: Image
}
]
}, {
model: Table2,
include: [
{
model: Table3,
where:{ deleted: 0 }
include: [
{
model: Table4,
where:{ deleted: 0 }
}
]
}
]
}
]
}
Table1.findAndCountAll(option)
.then(function (results) { res.json(results) })