Laravel how can get this relation - php

Question

Consider a digital store
Definition:
Buyer->all buyer
Products->all products
Downloads->store those products that buyer bought
a Buyer can buy a Product and it store in Downloads, now I want to show to buyer list of downloads.
ProductController.php
public function buyerproducts()
{
$user = auth()->guard('buyer')->user();
if ($user) {
$files = Product::where('deleted', 0)
->where('deleted', 0)
->with('files', 'province:id,name', 'city:id,name')
->get();
// and here I got a loop.. to add some extra data
return response()->json(['data' => $files], 200);
} else {
return response()->json(['success' => 'no content'], 204);
}
}
Product.php
function files()
{
return $this->hasManyThrough('App\Download', 'App\Buyer', 'id', 'product_id', 'buyer_id', 'id');
}
But it return all data, not what buyer bought. any idea?
Note, that I have to get this data in product controller not download.
Products:
-----------------------
|id | name | seller_id |
-----------------------
| 1 | bmw | 1 |
-----------------------
| 2 | benz | 1 |
-----------------------
| 2 | reno | 2 |
-----------------------
Downloads:
------------------------------
|id | product_id | buyer_id |
------------------------------
| 1 | 1 | 1 |
------------------------------
| 2 | 1 | 2 |
------------------------------
| 3 | 2 | 22 |
------------------------------
Buyer:
------------------------------
|id | name | email |
------------------------------
| 1 | john | # |
------------------------------
| 2 | mike | # |
------------------------------
| 3 | dave | # |
------------------------------

Answer 1

The HasManyThrough relationship is expecting to go through 2 hasMany relationships, however, looking at your table definition, the first relationship is hasMany but the second would be a belongsTo. Since both keys relate to a single row in a different table (both belongsTo) we can instead create a belongsToMany relationship instead and treat the downloads table as a pivot.
There are a couple of different ways you can go about this.
Firstly, I would suggest setting up the relationships between Buyer and Product (is you haven't already done so):
Product
public function buyers()
{
return $this->belongsToMany(Buyer::class, 'downloads')->withTimestamps();
}
Buyer
public function products()
{
return $this->belongsToMany(Product::class, 'downloads')->withTimestamps();
}
Then in your controller method you could either keep the same query and use whereHas():
public function buyerproducts()
{
$user = auth()->guard('buyer')->user();
if ($user) {
$files = Product::where('deleted', 0)
->whereHas('buyers', function ($query) use ($user) {
$query->where('buyers.id', $user->id);
})
->with('files', 'province:id,name', 'city:id,name')
->get();
// and here I got a loop.. to add some extra data
return response()->json(['data' => $files], 200);
}
return response()->json(['success' => 'no content'], 204);
}
or alternatively you could not just query the products straight from the $user (buyer):
public function buyerproducts()
{
$user = auth()->guard('buyer')->user();
if ($user) {
$files = $user->products()->where('deleted', 0)
->whereHas('buyers', function ($query) use ($user) {
$query->where('buyers.id', $user->id);
})
->with('files', 'province:id,name', 'city:id,name')
->get();
// and here I got a loop.. to add some extra data
return response()->json(['data' => $files], 200);
}
return response()->json(['success' => 'no content'], 204);
}

Answer 2

Why don't you go with getting the products as Buyer object relationship.
So you define products in Buyer.php:
function products()
{
return $this->hasManyThrough('App\Download', 'App\Product', 'id', 'buyer_id', 'product_id', 'id');
}
And in the controller you can call it like:
$buyer->with([
'products.province:id,name',
'products.city:id,name'
])
->whereHas('products', function($query){
$query->where('deleted', 0)
})
->get()
then you can go with return response()->json(['data' => $buyer->products], 200);