SUM column in bookshelfjs relationship - node.js

Question

I want to sum a column in a Bookshelfjs relationship. I have my query set up as
return this.hasMany('MutualFundPortfolio').query().sum('balance');
But I am having this error TypeError: Cannot read property 'parentFk' of undefined any body has any clue how solve this? It seems Bookshelf doesn't support sum
const moment = require('moment');
const Bookshelf = require('../bookshelf');
require('./wishlist');
require('./kyc');
require('./wallet');
const User = Bookshelf.Model.extend({
tableName: 'users',
hasTimestamps: true,
hidden: ['code', 'password'],
toJSON(...args) {
const attrs = Bookshelf.Model.prototype.toJSON.apply(this, args);
attrs.created_at = moment(this.get('created_at')).add(1, 'hour').format('YYYY-MM-DD HH:mm:ss');
attrs.updated_at = moment(this.get('updated_at')).add(1, 'hour').format('YYYY-MM-DD HH:mm:ss');
return attrs;
},
local_wallet() {
return this.hasMany('LocalWallet').query((qb) => {
qb.orderBy('id', 'DESC').limit(1);
});
},
mutual_fund_portfolio() {
return this.hasMany('MutualFundPortfolio').query().sum('balance');
},
global_wallet() {
return this.hasMany('GlobalWallet').query((qb) => {
qb.orderBy('id', 'DESC').limit(1);
});
},
local_gift_card_wallet() {
return this.hasMany('LocalGiftCardWallet').query((qb) => {
qb.orderBy('id', 'DESC').limit(1);
});
},
global_gift_card_wallet() {
return this.hasMany('GlobalGiftCardWallet').query((qb) => {
qb.orderBy('id', 'DESC').limit(1);
});
}
});
module.exports = Bookshelf.model('User', User);
Above is the full user model. I am then getting the value as
return User.where({ id })
.orderBy('id', 'DESC')
.fetch({
withRelated: [
'mutual_fund_portfolio',
'local_wallet',
'global_wallet',
'local_gift_card_wallet',
'global_gift_card_wallet'
]
})
The mutual_fund_portfolio comes out as an empty array.

Answer 1

hasMany performs a simple SQL join on a key. I believe the TypeError: Cannot read property 'parentFk' of undefined error refers to the fact that the table you are referencing here MutualFundPortfolio does not share a key with the table in the model you are using here.
It's not visible above sample but I'm assuming it's something like:
const User = bookshelf.model('User', {
tableName: 'users',
books() {
return this.hasMany('MutualFundPortfolio').query().sum('balance');
}
})
In my hypothetical example the users table has a primary key id column userId that is also in MutualFundPortfolio as a foreign key. My guess is that the error is because MutualFundPortfolio does not have that column/foreign key.