Sequelize model prototype show add function, but fails when executed - mysql

Question

I am having trouble adding users to my boards model using sequelize. My associations are defined as follows:
module.exports = function(sequelize, DataTypes) {
var Board = sequelize.define("Board", {
name: {
type: DataTypes.STRING,
allowNull: false,
validate: {
len: [1]
}
},
favorited: {
type: DataTypes.BOOLEAN,
allowNull: false,
defaultValue: false
}
});
Board.associate = function(models) {
Board.belongsTo(models.User, {
foreignKey: {
name: "OwnerId"
}
});
Board.belongsToMany(models.User, {
through: "UserBoards"
});
};
return Board;
};
And my user model:
module.exports = function(sequelize, DataTypes) {
var User = sequelize.define("User", {
name: {
type: DataTypes.STRING,
allowNull: false,
validate: {
isAlphanumeric: true
}
},
email: {
type: DataTypes.STRING,
allowNull: false,
validate: {
isEmail: true
}
},
password: {
type: DataTypes.STRING,
allowNull: false
}
});
User.associate = function(models) {
User.belongsToMany(models.Board, {
through: "UserBoards"
});
};
return User;
};
Console logging Boards.prototype gives me the following:
Board {
_customGetters: {},
_customSetters: {},
validators: { name: { len: [Object] } },
_hasCustomGetters: 0,
_hasCustomSetters: 0,
rawAttributes:
{ id:
{ type: [Object],
allowNull: false,
primaryKey: true,
autoIncrement: true,
_autoGenerated: true,
Model: Board,
fieldName: 'id',
_modelAttribute: true,
field: 'id' },
name:
{ type: [Object],
allowNull: false,
validate: [Object],
Model: Board,
fieldName: 'name',
_modelAttribute: true,
field: 'name' },
favorited:
{ type: BOOLEAN {},
allowNull: false,
defaultValue: false,
Model: Board,
fieldName: 'favorited',
_modelAttribute: true,
field: 'favorited' },
createdAt:
{ type: [Object],
allowNull: false,
_autoGenerated: true,
Model: Board,
fieldName: 'createdAt',
_modelAttribute: true,
field: 'createdAt' },
updatedAt:
{ type: [Object],
allowNull: false,
_autoGenerated: true,
Model: Board,
fieldName: 'updatedAt',
_modelAttribute: true,
field: 'updatedAt' },
OwnerId:
{ name: 'OwnerId',
type: [Object],
allowNull: true,
references: [Object],
onDelete: 'SET NULL',
onUpdate: 'CASCADE',
Model: Board,
fieldName: 'OwnerId',
_modelAttribute: true,
field: 'OwnerId' } },
attributes: [ 'id', 'name', 'favorited', 'createdAt', 'updatedAt', 'OwnerId' ],
_isAttribute: { [Function: memoized] cache: MapCache { size: 0, __data__: [Object] } },
getUser: [Function],
setUser: [Function],
createUser: [Function],
getUsers: [Function],
countUsers: [Function],
hasUser: [Function],
hasUsers: [Function],
setUsers: [Function],
addUser: [Function],
addUsers: [Function],
removeUser: [Function],
removeUsers: [Function] }
But when I try to runt he following in my routes it says that addUser/addUsers are not functions:
router.get("/boards/:id/users/:uid", function(req, res) {
var query = {};
if (req.params.id) {
query.id = req.params.id;
db.Board.findAll({
where: query
}).then(function(dbBoard) {
dbBoard.addUser(req.params.uid);
res.json(dbBoards);
});
}
});
Any help would be appreciated. Thank you.

Answer 1

Adding an association is instance specific. You have to call this method on a single instance of the Board model. For example:
const singleBoard = db.board.findOne({where: query};
const user = db.users.findOne({where: {id: parseInt(req.params.uid)});
singleBoard.addUser(user);
You can iterate through the array you get from querying through findAll if you have to do the same operation on multiple boards.
https://sequelize.org/master/manual/advanced-many-to-many.html