get data from intermediate table in laravel - laravel-7

Question

i have 2 model(SaleInvoice and Product) with many to many relation
in SaleInvoice model :
public function products()
{
return $this->belongsToMany(Product::class, 'sale_invoice_product', 'saleInvoice_id', 'product_id')->withPivot('count');
}
in Product Model:
public function saleInvoices()
{
return $this->belongsToMany(SaleInvoice::class, 'sale_invoice_product', 'product_id', 'saleInvoice_id');
}
this is the example of data that recorded in sale_invoice_product table(intermediate table)
id | saleInvoiceId | product_id | count
1 | 1500 | 1 | 3
2 | 1500 | 3 | 2
3 | 1500 | 4 | 4
4 | 1501 | 1 | 1
5 | 1501 | 4 | 1
how can i access to data of product and sale invoice from this table like below(in json mode for api request)
product_id | product_name | count | saleInvoice | date
1 LG 3 1500 2020-05-12
3 SONY 2 1500 2020-05-13
4 OT 4 1500 2020-05-17
1 LG 1 1501 2020-05-19
4 OT 1 1501 2020-05-22
i want to return a json file in SaleInvoiceController with top format

Answer 1

Your work was good, Just enough make a API resource for this model and send attributes as you want, For accessing to pivot table you could use $product->pivot->count.

Answer 2

You can try one of these methods
Building a model for sale_invoice_product table with relations to SaleInvoice and Product. Then manually construct the JSON in your controller
Build an SQL View and a Model for it
Solution 1: Building a model to the intermediate table and manually constructing the JSON
Let's say you built a model called SaleInvoiceProduct that has product() relation to the Products table and saleInvoice() relation to the SaleInvoices table. In your controller you can do this
$resultInvoiceProducts = [];
$allSaleInvoiceProducts = SaleInvoiceProduct::all();
foreach ($allSaleInvoiceProducts as oneSaleInvoiceProduct) {
$tempSaleInvoiceProduct = new stdClass();
$tempSaleInvoiceProduct->product_id = oneSaleInvoiceProduct->product_id;
$tempSaleInvoiceProduct->product_name = oneSaleInvoiceProduct->product->name;
$tempSaleInvoiceProduct->saleInvoiceId = oneSaleInvoiceProduct->saleInvoiceId;
$tempSaleInvoiceProduct->data = oneSaleInvoiceProduct->saleInvoice->date;
array_push($resultInvoiceProducts, $tempSaleInvoiceProduct);
}
Solution 2: Using SQL Views
You can create an SQL View that uses Joins to construct the data you need
DROP VIEW IF EXISTS vSaleInvoiceProduct;
CREATE VIEW vSaleInvoiceProduct AS
SELECT sp.product_id,
sp.saleInvoiceId,
sp.`count`,
p.product_name,
s.`date`
FROM SaleInvoiceProduct sp
LEFT JOIN SaleInvoices s on sp.saleInvoiceId = s.saleInvoiceId
LEFT JOIN Products p on sp.product_id = p.product_id
Then you can create a Laravel model for this View just like you would do for any table, call the ::all() method on it and directly return the results with json()