Releases · alfateam/orange-orm

11 May 20:44

lroal

v3.10.0

c4cf9fd

v3.10.0

Now supporting aggregates

You can count records and aggregate numerical columns. This can either be done across rows or separately for each row.
Supported functions include:

count
sum
min
max
avg

The aggregate function effeciently groups data together.
In this particular example , for each customer, it counts the number of lines associated with their orders and calculates the total amount of these lines.
Under the hood, it will run an sql group by customerId and customerName.

import map from './map';
const db = map.sqlite('demo.db');

getAggregates();

async function getAggregates() {
  const orders = await db.order.aggregate({
    where: x => x.orderDate.greaterThan(new Date(2022, 0, 11, 9, 24, 47)),
    customerId: x => x.customerId,
    customerName: x => x.customer.name,
    numberOfLines: x => x.count(x => x.lines.id),
    totals: x => x.sum(x => lines.amount)    
  });
}

Assets 2

08 May 08:09

lroal

v3.9.0

03dfd3b

v3.9.0

Possible to elevate associated column on a related table to a parent table when fetching. Example with the customer.balance column below.

  const orders = await db.order.getAll({
    balance: x => x.customer.balance
  });

Assets 2

04 May 06:06

lroal

v3.8.0

1544de6

v3.8.0

Aggregate operators

  const orders = await db.order.getAll({
    numberOfLines: x => x.count(x => x.lines.id),
    totalAmount: x => x.sum(x => x.lines.amount),
    minAmount: x => x.min(x => x.lines.amount),
    maxAmount: x => x.max(x => x.lines.amount),
    avgAmount: x => x.avg(x => x.lines.amount),
  });