续集多对多关系

Question

I'm using Sequelize, and I have two models, with many to many relationships, the employees model it has RegistrationNmuber as Primary Key, firstName, LastName amongst other information, and a message model it has an id attribute, from attribute which is the RegistrationNumber of the employee, and the to attribute contain the another RegistrationNumber of another employee, and message attribute, what I want to do is find the information of employee from the 'from attribute of message model', is it possible to do it and how?? if not can anybody please suggest a solution

             // employee model:
            module.exports = (sequelize,Sequelize) => {
const Employee = sequelize.define('Employee' ,{

 RegistrationNumber :{
  type: Sequelize.BIGINT,
  primaryKey: true
 },
 CIN : {
    type:Sequelize.BIGINT,
    unique: true
 },

FirstName: {
  type: Sequelize.STRING,

},
LastName: {
  type: Sequelize.STRING

},
image:{
  type: Sequelize.BLOB
},
 DateofBirth: {
  type: Sequelize.DATE,

},
PlaceOfBirth: {
  type: Sequelize.STRING,

},
Address: {
  type: Sequelize.TEXT,

},
Email: {
  type: Sequelize.TEXT,
  unique: true

},
PhoneNumber: {
  type: Sequelize.BIGINT,

},
DateofNamingRank :{
 type: Sequelize.DATE
},
DateofDesignationAdministration :{
  type: Sequelize.DATE
 },
 Type :{
  type: Sequelize.STRING
 },
 DateofDemarcation :{
  type: Sequelize.DATE
 },
 Item :{
  type: Sequelize.STRING
 },
 Rank :{
  type: Sequelize.STRING
 },
 Case :{
  type: Sequelize.STRING
 },
 Position :{
  type: Sequelize.STRING
 },
 ActualWork :{
  type:Sequelize.STRING
 },
 Wire :{
  type: Sequelize.STRING
 },
 Plan :{
  type: Sequelize.STRING
 },
 Specialization :{
  type: Sequelize.STRING
 },
 Intrest :{
  type: Sequelize.STRING
 },
 Role :{
   type:Sequelize.STRING
 },
 Login:{
   type:Sequelize.STRING
 },
 Password :{
   type:Sequelize.STRING
 }
    }, 
    );  return Employee;
     }

     // message Model
        module.exports =( sequelize,Sequelize)=>{
const Messages = sequelize.define('Messages' ,{

    id :{
        type:  Sequelize.BIGINT,
        primaryKey: true,
        autoIncrement: true
    },
    from :{
        type : Sequelize.BIGINT
    },
    to :{
        type : Sequelize.BIGINT  
    } ,
    message:{
       type: Sequelize.TEXT   
    }
})
return Messages;

}

                 // Relation
                db.employee.belongsToMany(db.messages,{
               through : "employee_Messages",
                } )
                db.messages.belongsToMany(db.employee , 
                 {through:"employee_Messages"})   

Answer 1

 db.messages.belongsTo(db.employee, { foreignKey: "from" }) db.messages.belongsTo(db.employee, { foreignKey: "to" }) messages.find({ where: { id: messageId }, include: [{ model: employee, as: from, required: true }, { model: employee, as: to, required: true } ] }).then(message => { const userfrom = message.from; const userto = message.to; })

I guess this helps.