我定义了两个模型:
db / models / User.js
const Sequelize = require('sequelize');
module.exports = (sequelize, DataTypes) => {
class User extends Sequelize.Model {}
const config = {
sequelize,
modelName: 'user',
underscored: true,
paranoid: true,
});
User.init({
first_name: {
type: DataTypes.STRING,
},
last_name: {
type: DataTypes.STRING,
},
}, config);
return User;
};
db / models / Group.js
const Sequelize = require('sequelize');
module.exports = (sequelize, DataTypes) => {
class Group extends Sequelize.Model {}
const config = {
sequelize,
modelName: 'group',
underscored: true,
paranoid: true,
});
Group.init({
name: {
type: DataTypes.STRING,
allowNull: false,
},
}, config);
return Group;
};
我想在那时之间创建多对多关联(这样一个组可以有许多用户,并且一个用户可以属于许多组。这是我的db/index.js
:
db / index.js
const Sequelize = require('sequelize');
const Logger = require('../config/logger');
const { DB } = require('../config/vars');
const UserModel = require('./models/User');
const GroupModel = require('./models/Group');
const sequelize = new Sequelize(
DB.name,
DB.username,
DB.password,
{
host: DB.host,
dialect: 'postgres',
},
);
const Models = {
User: UserModel(sequelize, Sequelize),
Group: GroupModel(sequelize, Sequelize),
};
const setup = async () => {
// Associations
Models.User.belongsToMany(Models.Group, {
through: 'UserGroups',
as: { singular: 'group', plural: 'groups' },
});
Models.Group.belongsToMany(Models.User, {
through: 'UserGroups',
as: { singuler: 'user', plural: 'users' },
});
await sequelize.sync({ force: true });
};
module.exports = {
...Models,
setup,
Seeders,
Sequelize,
sequelize,
};
当我执行User.findAll()
时,对象中没有返回groups
属性。我应该如何在这里正确建立多对多关系?
答案 0 :(得分:0)
User.findAll()
将默认返回其关联的模型,您需要像这样使用include
:
User.findAll({
include : {
model : Groups
}
})