mysql - SequelizeEagerLoadingError : Role is not associated to User

Question

我将 Sequelize 与 MYSQL 和 express 结合使用。当我尝试使用 include 从相关模型中选择数据时，出现 SequelizeEagerLoadingError: Role is not associated to User。

我有两个模型，用户和角色。用户通过 RoleUser 属于 ToMany Roles，角色通过 RoleUser 属于 ToMany 用户。这是我的模型:

//用户模型

'use strict';

module.exports = (sequelize, DataTypes) => {
  const User = sequelize.define('User', {
    id: {type:DataTypes.UUID,allowNull:false,unique:true,primaryKey:true},
    UserName: {type:DataTypes.STRING,unique:true,allowNull:false},
     Email: {type:DataTypes.STRING,allowNull:false,unique:true,validate: { isEmail: {msg: "Invalid Email"} }},
    Password: {type:DataTypes.STRING,allowNull:false},

  }, {});
  User.associate = function(models) {


        User.belongsToMany(models.Role,
            {
        through: 'RoleUser',
        foreignkey:'UserId'

    })




 };
  return User;
};

//Role Model
'use strict';
module.exports = (sequelize, DataTypes) => {
  const Role = sequelize.define('Role', {
    id: {type:DataTypes.UUID,allowNull:false,unique:true,primaryKey:true},
    Name: DataTypes.STRING,
    Description: DataTypes.STRING
  }, {});
  Role.associate = function(models) {
    Role.belongsToMany(models.User,
        {
            through:'RoleUser',
            foreignKey:'RoleId'

        }),


  };
  return Role;
};

//My query on user model

xports.index = function(req, res) {
  return User.findAll({ 
          include: [{
          model: Role,

        }],

    attributes:{
        exclude: ['Password','createdAt','updatedAt']

    }}).then((users)=>{
    console.log(users)
    }).catch(error=>{
    console.log(error);
    })

//错误

 SequelizeEagerLoadingError: Role is not associated to User!

 **STATUS CODE: 200(OK)**

 I am getting same error in other models in the entire project. According to me the associations is correctly established and I can see in the PHPMyAdmin Relation View.

 *Express Version: 4.16.4
 Sequelize Version: 4.31.2
 Mysql2 version: 1.6.1*

 Any help. What am I doing wrong.

Answer 1

好的，所以您需要指定如何调用包含。

User.associate = function(models) {
  User.belongsToMany(models.Role,{
    through: 'RoleUser',
    foreignkey:'UserId',
    as: 'Roles'
  })
};

如果需要，您需要以其他方式从角色到用户，以及任何其他关联。然后根据您的查询:

User.findAll({ 
  include: [{
    model: Role,
    as: 'Roles'
  }],
  attributes:{ exclude: ['Password','createdAt','updatedAt'] }
})