Sequelize 'hasMany' 关联(模型)计数在查询执行中的属性

Sequelize #39;hasMany#39; associated(model) count in attributes in query execution(Sequelize hasMany 关联(模型)计数在查询执行中的属性)

问题描述

续集版本:4.22.6，MySql版本:5.7.8我想在查询执行中将 'hasMany' 关联(CompanyUser)计数(在 _user_count_ 的位置)

Sequelize version: 4.22.6, MySql version:5.7.8 I want to 'hasMany' associated(CompanyUser) count in attibutes(at place of _user_count_) in query execution

/**
* Company user associate with Company with belongsTo relation
*/
`CompanyUser.belongsTo(Company, { foreignKey: 'company_id', targetKey: 'id'});`

/**
* Company  associate with Company user with hasMany relation
*/
`Company.hasMany(CompanyUser, { foreignKey: 'company_id', sourceKey: 'id'});`

`return Company.findAll({
    attributes: [
        'id', 'title', 'is_enabled', '_user_count_'
    ]
    include: [
        {
            model: sqConn.CompanyUser,
            attributes: ['id'],
        },
        {
            model: sqConn.CompanyLogo,
            attributes:['file_object'],
        }
    ],
}).then(function(model) {
    return sequelize.Promise.resolve(model);
}).catch(function(err) {
    return sequelize.Promise.reject(err);
});`

带有左连接的简单 MySQL 查询可以正常工作并给出计数.

Simple MySQL query with left-join works fine and give count.

推荐答案

你可以使用 sequelize.fn ，尝试运行下面的查询:

You can use sequelize.fn , try to run below query :

Company.findAll({
    attributes: [
        'id', 'title', 'is_enabled',
        [sequelize.fn('count', sequelize.col('company_users.id')) ,'user_count'] // <---- Here you will get the total count of user
    ],
    include: [
        {
            model: sqConn.CompanyUser,
            attributes: [] // <----- Make sure , this should be empty
        }
    ],
    group: ['companies.id'] // <---- You might require this one also
}).then(data => { 
    console.log(data); // <---- Check the output
})

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