Laravel - Eloquent - How to sum related data and query agaist it? - php

Question

I'm looking for help with database queries, not collection solution
I have the following models:
User
Order
Product
User hasMany orders, and orders belongsToMany products
I'm in a place where I would need to query users and select all sold products, meaning the sum of all products quantities that are attached to the orders.
quantity value is stored in the order_product pivot table.
Table name: users, orders, products & order_product
Ideally, I would like to make queries like: select all users that have sold at least 100 products, for example.
DB::raw() & selectRaw is most likely the way to go, I think(?), but I'm not sure about the syntax and how to actually make the query, with and without where clause.
Thanks a lot in advance, this has bothered me for a while
Database Schemas
Schema::create('users', function (Blueprint $table) {
$table->bigIncrements('id');
});
Schema::create('orders', function (Blueprint $table) {
$table->bigIncrements('id');
$table->unsignedBigInteger('user_id')->index();
});
Schema::create('order_product', function (Blueprint $table) {
$table->bigIncrements('id');
$table->unsignedBigInteger('order_id')->index();
$table->unsignedBigInteger('product_id')->index();
$table->integer('quantity')->unsigned()->default(1);
});
Schema::create('products', function (Blueprint $table) {
$table->bigIncrements('id');
});
UPDATE
This far I have come:
\App\User::addSelect([
'sold_products_count' => \App\Order::whereColumn('user_id', 'users.id')
->join('order_product', 'orders.id', '=', 'order_product.order_id')
->select(DB::raw('sum(order_product.quantity) as qty')),
])->where('users.sold_products_count', '>=', 100);
HOWEVER, the last statement where('users.sold_products_count', '>=', 100) throws error, cuz there's no sold_products_count column.
So I think I'm on the right track, but how I can use the new sum column in where clause?
Can I use addSelect, or do I have to use something else?

Answer 1

Finally, I solved this
Here's the answer:
\App\User::addSelect([
'sold_products_count' => \App\Order::whereColumn('user_id', 'users.id')
->join('order_product', 'orders.id', '=', 'order_product.order_id')
->select(DB::raw('sum(order_product.quantity) as qty')),
])->having('sold_products_count', '>=', 100);
The idea is to first count the sum via addSelect and then we can query against the value using having, neat

Answer 2

DB::table('users')
->join('orders', 'orders.user_id', '=', 'users.id')
->join('order_product', 'orders.id', '=', 'order_product.order_id')
->select('users.*', DB::raw('sum(order_product.quantity) as qty'))
->having('qty', '>=', 100)
->get();