Get Count Of Nested Entities using Laravel Eloquent - mysql

Question

I have got 3 database tables clients, coupons and categories
clients table
id,
name,
website,
description,
logo,
slug
categories table
id,
name,
slug
coupons table
id,
client_id,
category_id,
type,
coupon,
title,
description,
link,
views,
slug,
expiry
The relationship is
1) many coupons belongs to client ( many to one relationship)
2) many coupons belongs to category ( many to one relationship)
I am using laravel 5.1.
How can i get the unique count of clients with the clients details , number of coupons a client has and the count of total categories an individual client has.
simplified : i need to get the client details and display that xxx number of coupons are available in the xxx number of categories for a particular client.
so far i can get the unique client details and the number of the coupons count.
public function getAvailableClientsWithItemCountList($page = 1)
{
return Client::join('coupons', 'clients.id', '=', 'coupons.client_id')
->join('categories', 'coupons.category_id', '=', 'categories.id')
->where('coupons.expiry', '>', Carbon::today())
->groupBy('clients.id')
->skip(STORES_PER_REQUEST*($page-1))
->take(STORES_PER_REQUEST)
->get(['clients.id', 'clients.name', 'clients.slug', 'clients.logo', DB::raw('count(clients.id) as dealsCount'), DB::raw('count(categories.id) as categoriesCount')]);
}
STORES_PER_REQUEST = 9 (constant) for paginating.
thanks in advance.

Answer 1

If you have your relationships set up you could do something like:
/**
* Mock relationship for eager loading coupon count
*
* #return mixed
*/
public function couponCount()
{
return $this->hasOne(Coupon::class)
->selectRaw('client_id, count(*) as aggregate')
->groupBy('client_id');
}
public function getCouponCountAttribute()
{
// if relation is not loaded already, let's do it first
if (!$this->relationLoaded('couponCount')) {
$this->load('couponCount');
}
$related = $this->getRelation('couponCount');
// then return the count directly
return ($related) ? (int) $related->aggregate : 0;
}
The above can be used in your Client model, and then you can just alter the couponCount relationship method for your Category model (if you wanted to).
Then add the following for your Category count:
/**
* Mock relationship for eager loading category count
*
* #return mixed
*/
public function categoryCount()
{
return $this->hasOne(Coupon::class)
->selectRaw('category_id, count(*) as aggregate')
->groupBy('client_id, category_id');
}
public function getCategoryCountAttribute()
{
// if relation is not loaded already, let's do it first
if (!$this->relationLoaded('categoryCount')) {
$this->load('categoryCount');
}
$related = $this->getRelation('categoryCount');
// then return the count directly
return ($related) ? (int) $related->aggregate : 0;
}
You can then add a query scope in your Coupon model for getting coupons that haven't expired by something like:
public function scopeActive($query)
{
$query->where('expiry', '>', Carbon::today());
}
If you're only ever going to be getting the count for coupons that haven't expired you can add you can add this straight on to the relationship e.g.
groupBy('client)id')->active()
Now you should be able to eager load the relationship like so:
$clients = Client::with('couponCount', 'clientCount')
->skip(STORES_PER_REQUEST * ($page - 1))
->take(STORES_PER_REQUEST)
->get();
Or you could attach the query scope to the eager load i.e.
$clients = Client::with(['couponCount' => function ($q) {$q->active()}, 'clientCount' => function ($q) {$q->active()}]) ...
Hope this helps!

Answer 2

Okay i figured out myself with additional info as coupon type and the categories available.
The key i did was just added the case in count and removed the join of the categories table.
the final code looked like this
return App\Client::join('coupons', 'clients.id', '=', 'coupons.client_id')
->where('coupons.expiry', '>', \Carbon\Carbon::today())
->orderBy('clients.position', 'desc')
->groupBy('clients.id')
->skip(STORES_PER_REQUEST*(1-1))
->take(STORES_PER_REQUEST)
->get(['clients.id', 'clients.name', 'clients.slug', 'clients.logo', DB::raw('count(clients.id) as total'), DB::raw('count(CASE WHEN coupons.type=\'Coupon\' THEN 1 ELSE NULL END) as couponsCount'), DB::raw('count(CASE WHEN coupons.type=\'Deals\' THEN 1 ELSE NULL END) as dealsCount'), DB::raw('count(Distinct category_id) as categoriesCount')]);
The result was
[{
"id": "8",
"name": "Archies Online",
"slug": "archies-online",
"logo": "Archiesonline.jpg",
"total": "22",
"couponsCount": "20",
"dealsCount": "2",
"categoriesCount": "9"
}, {
"id": "5",
"name": "Shop Clues",
"slug": "shop-clues",
"logo": "Shopclues.jpg",
"total": "24",
"couponsCount": "24",
"dealsCount": "0",
"categoriesCount": "9"
}, {
"id": "6",
"name": "Lens Kart",
"slug": "lens-kart",
"logo": "Lenskart.jpg",
"total": "25",
"couponsCount": "25",
"dealsCount": "0",
"categoriesCount": "8"
}, {
"id": "7",
"name": "Amazer",
"slug": "amazer",
"logo": "Amzer.jpg",
"total": "21",
"couponsCount": "21",
"dealsCount": "0",
"categoriesCount": "8"
}, {
"id": "1",
"name": "Flipkart",
"slug": "flipkart",
"logo": "Flipkart.jpg",
"total": "17",
"couponsCount": "17",
"dealsCount": "0",
"categoriesCount": "9"
}, {
"id": "2",
"name": "Make My Trip",
"slug": "make-my-trip",
"logo": "Makemytrip.jpg",
"total": "11",
"couponsCount": "11",
"dealsCount": "0",
"categoriesCount": "8"
}]
This did the trick for now :);