Getting count from pivot table in laravel eloquent - php

Question

I have a many to many relationship for orders and products.
<?php
class Order extends Eloquent {
public function user()
{
return $this->belongsTo('User');
}
public function products()
{
return $this->belongsToMany('Product');
}
}
?>
<?php
class Product extends Eloquent {
public function orders()
{
return $this->belongsToMany('Order');
}
}
?>
Need to fetch the number of times each product is ordered.In mysql,this task can be achieved by using the following query
SELECT products.id, products.description, count( products.id )
FROM products
INNER JOIN order_product ON products.id = order_product.product_id
INNER JOIN orders ON orders.id = order_product.order_id
GROUP BY product_id
LIMIT 0 , 30
Result of the above query is as follows:-
id description count(products.id)
1 Shoes 3
2 Bag 2
3 Sun glasses 2
4 Shirt 2
How this task can be achieved using laravel eloquent (without using query builder)????How can i fetch the number of times each product is ordered using laravel eloquent??

Answer 1

For future viewers, as of Laravel 5.2, there is native functionality for counting relationships without loading them, without involving your resource model or accessors -
In the context of the example in the approved answer, you would place in your controller:
$products = Product::withCount('orders')->get();
Now, when you iterate through $products on your view, there is a orders_count (or, generically, just a {resource}_count) column on each retrieved product record, which you can simply display as you would any other column value:
#foreach($products as $product)
{{ $product->orders_count }}
#endforeach
This method produces 2 fewer database queries than the approved method for the same result, and the only model involvement is ensuring your relationships are set up correctly. If you're using L5.2+ at this point, I would use this solution instead.

Answer 2

Mind that Eloquent uses Query\Builder under the hood, so there is no such thing in Laravel, like 'query eloquent without using query builder'.
And this is what you need:
// additional helper relation for the count
public function ordersCount()
{
return $this->belongsToMany('Order')
->selectRaw('count(orders.id) as aggregate')
->groupBy('pivot_product_id');
}
// accessor for easier fetching the count
public function getOrdersCountAttribute()
{
if ( ! array_key_exists('ordersCount', $this->relations)) $this->load('ordersCount');
$related = $this->getRelation('ordersCount')->first();
return ($related) ? $related->aggregate : 0;
}
This will let you take advantage of eager loading:
$products = Product::with('ordersCount')->get();
// then for each product you can call it like this
$products->first()->ordersCount; // thanks to the accessor
Read more about Eloquent accessors & mutators,
and about dynamic properties, of which behaviour the above accessor mimics.
Of course you could use simple joins to get exactly the same query like in you example.

Answer 3

If you already have the $products object, you can do the following:
$rolecount = $products->roles()->count();
Or if you are using eager loading:
$rolecount = $products->roles->count();
Cheers.

Answer 4

I am using Laravel 5.1 and i am able to accomplish that by doing this
$photo->posts->count()
And the posts method in Photo model looks like this
public function posts(){
return $this->belongsToMany('App\Models\Posts\Post', 'post_photos');
}