Laravel | three fields combination Valdiation - laravel

Question

How to do a 3 fields combination validation?
I have this table merchant_product, the table has 4 columns :
id
merchant_id
product_id
branch_id
I don't want the same row duplicated like this when storing data.
Example :
id
merhcant_id
product_id
branch_id
1
1
1
1
2
1
1
1
I tried this approach but it seems not to work.
Here is my sample validation method :
$rules = [
'product_id' => ['required','unique:merchant_product,product_id,NULL,id,merchant_id,'.Auth::id()', new Varchar],
'merchant_id' => [new Varchar],
'branch_id' => ['required','unique:merchant_product,branch_id,NULL,id,merchant_id,'.Auth::id()', new Varchar],
];

Answer 1

You can use Rule::unique to validate both column together :
'product_id' => [
'required',
Rule::unique('merchant_product')->where(function ($query) use($request) {
return $query->where('product_id', $request->product_id)
->where('branch_id', $request->branch_id);
}),
],
Don't forget to add use Illuminate\Validation\Rule; on the top

Answer 2

Use firstOrCreate()
MerchantProduct::firstOrCreate([
'product_id' => $productId,
'merchant_id' => $merchantId,
'branch_id' => $brandId
]);
This will stop any duplicate record being created, using all 3 columns without doing extra processing with rules.
See the following article for usage:
https://laravel.com/docs/8.x/eloquent#retrieving-or-creating-models