How to use having clause on relationship with sequelize node - mysql

Question

I have 2 models, business and documents in a 1:n relationship, i want to filter the business in two ways,
business that has documents where every document.due_balance is greater than 0
business that has documents where every document.due_balance is equals to 0
I want to make something like this
select
A.name, B.due_balance, sum(B.due_balance) as total_due_balance
from
business A
inner join documents B ON A.id = B.business_id
group by A.id
having total_due_balance > 0;
select
A.name, B.due_balance, sum(B.due_balance) as total_due_balance
from
business A
inner join documents B ON A.id = B.business_id
group by A.id
having total_due_balance = 0;
these will get me what i want, the problem, is that the previus code was made with sequelize ORM, and i can't change it, something like this
const businesses = await db.business.paginate({
attributes: [
...
],
where: {
... //bunch of where
},
page: parseInt(params.page, 10) || 1,
paginate: parseInt(params.limit, 10) || 10,
});
here is where the problem begins, i don't know how to join the tables and use the having to filter it, i have tried addind this
let toInclude;
if (params.contactability === 'with_balance') {
toInclude = {
include : [
{
attributes: [
[db.Sequelize.fn('sum', db.Sequelize.col('due_balance')), 'total_due_balance'],
],
model: db.document,
as: 'documents',
having: db.Sequelize.where(db.Sequelize.fn('sum', db.Sequelize.col('due_balance')), {
$gt: 0,
}),
},
],
};
} else if(params.contactability === 'without_balance') {
toInclude = {
include : [
{
attributes: [
[db.Sequelize.fn('sum', db.Sequelize.col('due_balance')), 'total_due_balance'],
],
model: db.document,
as: 'documents',
having: db.Sequelize.where(db.Sequelize.fn('sum', db.Sequelize.col('due_balance')), {
$eq: 0,
}),
},
],
};
} else {
toInclude = {};
}
const businesses = await db.business.paginate({
attributes: [
...
],
where: {
...
},
...toInclude,
page: parseInt(params.page, 10) || 1,
paginate: parseInt(params.limit, 10) || 10,
});
but that does not work at all, how can i solve this problem?

Answer 1

I don't think HAVING will work without GROUP.
I would move the having clause outside the include section and use the AS aliases.
So, roughly:
group: ['id'], // and whatever else you need
having : { 'documents.total_balance_due' : {$eq : 0 }}
(Making some guesses vis the aliases)

Answer 2

To filter the date from joined table which uses groupby as well, you can make use of HAVING Property, which is accepted by Sequelize.
So with respect to your question, I am providing the answer.
You can make use of this code:
const Sequelize = require('sequelize');
let searchQuery = {
attributes: {
// include everything from business table and total_due_balance as well
include: [[Sequelize.fn('SUM', Sequelize.col('documents.due_balance')), 'total_due_balance']]
},
include: [
{
model: Documents, // table, which you require from your defined model
as: 'documents', // alias through which it is defined to join in hasMany or belongsTo Associations
required: true, // make inner join
attributes: [] // select nothing from Documents table, if you want to select you can pass column name as a string to array
}
],
group: ['business.id'], // Business is a table
having: ''
};
if (params.contactability === 'with_balance') {
searchQuery.having = Sequelize.literal(`total_due_balance > 0`);
} else if (params.contactability === 'without_balance') {
searchQuery.having = Sequelize.literal(`total_due_balance = 0`);
}
Business // table, which you require from your defined model
.findAll(searchQuery)
.then(result => {
console.log(result);
})
.catch(err => {
console.log(err);
});
Note : Change model name or attributes according to your requirement.
Hope this will help you or somebody else!