how to define the relations between 3 tables

I want to create a relations between 3 tables with 1 table, like:

here is my 3 tables write with sequelize models. case:

export default (sequelize, DataTypes) => {
  return sequelize.define('Case', {
    case_id: {type: DataTypes.INTEGER, field: 'case_id', primaryKey: true},
    name: {type: DataTypes.STRING(100), defaultValue: '', field: 'name'},
    code: {type: DataTypes.STRING(100), defaultValue: '', field: 'code'},
  }, {
    timestamps: false,
    tableName: 'T_CASE'
  })
}

caseRole:

export default (sequelize, DataTypes) => {
  return sequelize.define('CaseRole', {
    role_id: {type: DataTypes.INTEGER, field: 'role_id', primaryKey: true},
    name: {type: DataTypes.STRING(100), defaultValue: '', field: 'name'}
  }, {
    timestamps: false,
    tableName: 'T_CASE_ROLE_DEF'
  })
}

user:

export default (sequelize, DataTypes) => {
  return sequelize.define('User', {
    user_id: {type: DataTypes.INTEGER, field: 'user_id', primaryKey: true},
    sid: {type: DataTypes.STRING(100), defaultValue: '', field: 'sid'},
    login_name: {type: DataTypes.STRING(100), defaultValue: '', field: 'login_name'}
  }, {
    timestamps: false,
    tableName: 'T_USER'
  })
}

I want to join these 3 tables with 1 table like:

T_CASE_ROLE_USERS

字段名	类型	备注
case_id	number
role_id	number
user_id	number

and I want to know how to write associate method in my sequelize models, thks!!

Dialect: mysql __Database version: 5.7.15 __Sequelize version: 3.24.3

[felixfbecker]

Case.belongsToMany(User, {through: CaseRole});
User.belongsToMany(Case, {through: CaseRole});

All documented here: http://docs.sequelizejs.com/en/v3/docs/associations/#belongs-to-many-associations

[alitaheri]

Well the queries will be very complex, but with include you should be able to do what you need:

Case.findAll({
  include: [{
    model: CaseRoleUser,
    include: [{ model: Role }, {model: User }],
  }],
});