如何限制Sequelize JS中belongsToMany关联的包含? [英] How to limit includes on a belongsToMany association in Sequelize JS?

问题描述

我目前在 Sequelize 中有以下模型:

I currently have the following models in Sequelize:

产品

和

ProductList.belongsToMany(models.Product, { as: 'products', through: 
sequelize.models.ProductListProduct, foreignKey: 'productListId'});

和枢轴，ProductListProduct

我目前正在尝试让一系列 productList 显示在我的主页上，

I am currently trying to get a series of productList to show on my homepage,

并且需要将退回的产品限制为特定值(在本例中为 6):

and would need to limit the returned products to a certain value (6 in this case):

let productLists = await ProductList.findAll({
        where: {
            slug: ['recommended', 'new_and_promos']
        },
        include: [{
            model: Product,
            as: 'products',
            include: ['attributes', 'images'],
            where: {
                active: true
            }
        }],
        order: [
            [
                'products', ProductListProduct, 'position', 'ASC'
            ]
        ]
    })

这是当前的提取，但是如果我对包含添加一个限制，它会告诉我只有 hasMany 可以有 {separate: true} ；

This is the current fetch, however if I add a limit to the include, it tells me that only hasMany can have {separate: true} ;

总结一下，我想要实现的是返回 n 个 ProductList，每个 ProductList 只附加了 m 个 Product.

To recap, what I'm trying to achieve is to return n ProductList, each with just m Product attached.

推荐答案

设法让它像这样工作，看起来并不理想，但它完成了工作:

Managed to get it working like this, doesn't look ideal but it does the job:

let productLists = await ProductList.findAll({
            where: {
                slug: ['recommended', 'new_and_promos']
            },
            include: [{
                model: Product,
                as: 'products',
                include: ['attributes', 'images'],
                where: Sequelize.literal('`products->ProductListProduct`.`position` < 8')
            }],
            order: [
                [
                    'products', ProductListProduct, 'position', 'ASC'
                ]
            ]
        })

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