Question

我在节点中使用sequelize orm将对象映射到mysql db。基本上我有两个表产品和类别。一个产品属于一个类别，但一个类别可以有多个产品。在类别表格中，我有一列＆＃34; parent_id ＆＃34;它引用了自己的id。最多可以有三个级别的层次结构。

主要目标是查找具有属于父类别**的任何类别的产品，例如26.我可以在sql中推断查询，如下所示。

select * from product as p join category as c on p.category_id = c.id join  
category as c1 on c1.id = c.parent_id join category as c2 
on c2.id = c1.parent_id where c.id = 26 or c1.id = 26 or c2.id = 26

在sequelize中，我尝试通过包含以下

之类的引用来加载

{
        // upto three levels of category
        model : category,
        as : 'c',
        attributes : [ 'id' ],
        include : {
            model : category,
            as : 'c1',
            attributes : [ 'id' ],
            include : [ {
                model : category,
                as : 'c2',
                attributes : [ 'id' ]
            } ]
        }
    }

该连接完全有效，但如何适合where子句

c.id = 26或c1.id = 26或c2.id = 26

提前致谢。任何帮助都将非常感激。

Answer 1

尝试在查询的每个级别添加“where objects”。对象适用于表c的第一个。嵌套在include对象中的第二个对象适用于表c1，依此类推。

{
    // upto three levels of category
    model : category,
    as : 'c',
    attributes : [ 'id' ],
    where { id : 26 },
    include : {
        model : category,
        as : 'c1',
        attributes : [ 'id' ],
        where { id : 26 },
        include : [ {
            model : category,
            as : 'c2',
            attributes : [ 'id' ],
            where { id : 26 }
        } ]
    }
}

Sequelize - Where子句通过多个连接表

1 个答案: