Addding an object to a hasManyTrough relation on loopback

[PJEstrada006]

I have this three models:

    {
      "name": "ExeboardUserBoard",
      "base": "PersistedModel",
      "idInjection": true,
      "options": {
        "validateUpsert": true
      },
      "properties": {},
      "validations": [],
      "relations": {
        "exeboardUser": {
          "type": "belongsTo",
          "model": "exeboardUser",
          "foreignKey": "exeboardUserId"
        },
        "board": {
          "type": "belongsTo",
          "model": "board",
          "foreignKey": "boardId"
        },
      },
      "acls": [],
      "methods": {}
    }

Model: ExeboardUser

    {
      "name": "ExeboardUser",
      "base": "User",
      "idInjection": true,
      "options": {
        "validateUpsert": true
      },
      "properties": {
        "name": {
          "type": "string",
          "required": true
        }
      },
      "validations": [],
      "relations": {
        "boards": {
          "type": "hasMany",
          "model": "Board",
          "foreignKey": "exeboardUserId",
          "through": "ExeboardUserBoard"
        }
      },
      "acls": [],
      "methods": {}
    }

Model: Board

    {
      "name": "Board",
      "plural": "Boards",
      "base": "PersistedModel",
      "idInjection": true,
      "options": {
        "validateUpsert": true
      },
      "properties": {
        "name": {
          "type": "string",
          "required": true
        }
      },
      "validations": [],
      "relations": {
        "users": {
          "type": "hasMany",
          "model": "ExeboardUser",
          "foreignKey": "boardId",
          "through": "ExeboardUserBoard"
        }
      },
      "acls": [],
      "methods": {}
    }

I´m trying to prepopulate my db with a board having a single user. However I´m not able to access the `board.users` property. It gives me the error: 

    TypeError: Cannot read property 'type' of undefined

This is the code I have

    var users = [
        {
          name: "test"
   
        }
      ];
      //Create Board
      function createBoard(cb){
        pgdb.automigrate('Board', function(err) {
          //if (err) return cb(err);
          var Board = app.models.Board;
          Board.create([
            {name:"Board 1"
            },
            {name:"Board 2"
            }
   
            ],function(err,boards){
              boards[0].users.add(users[0]);
   
          });
   
        });
   
        //Create ExeboardUser
      function createExeboardUser(cb){
        pgdb.automigrate('ExeboardUser', function(err) {
          //if (err) return cb(err);
          var ExeboardUser = app.models.ExeboardUser;
            ExeboardUser.create(users,function(err,users){




            });
        });
      }

[Ebrahim Pasbani]

You should create `users` in loopback system. You consider it as a plain object.

`boards[0].users.add()` take an object with type `ExeBoardUser`