How to convert MySQL query to Eloquent Relationships? - relationship

Question

I don't really know what words or terms I would search. I have also read the documentation in laravel 5.7, https://laravel.com/docs/5.7/eloquent-relationships#many-to-many-polymorphic-relations.
But still I couldn't find the thing that I want.
The result that I am expecting is this in MySQL:
SELECT id as product_id, (SELECT name FROM products WHERE id = transactions.product_id), created_at FROM transactions WHERE user_id = 1
This is the result of the mysql query:
I already have a model:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Transactions extends Model
{
protected $table = 'transactions';
protected $fillable = [
'user_id', 'product_id'
];
public function product()
{
return $this->hasOne('App\Products')->select('name');
}
}
?>
Then in my controller:
public function transactions()
{
$transactions = new Transactions::where('user_id',Auth::id())->product;
return view('transactions', ['transactions' => $transactions]);
}

Answer 1

You should use belongsTo() relation. Transaction belongs to one product, product has many transactions.
Also, you can (or better should) rename model to a singlular. Then you don't need to use protected $table.
It is not necessarily to select only name.
Transaction model:
namespace App;
use Illuminate\Database\Eloquent\Model;
class Transaction extends Model
{
protected $fillable = ['user_id', 'product_id'];
public function product()
{
return $this->belongsTo('App\Product');
}
}
Controller:
public function transactions()
{
$transactions = Transaction::with('product')
->where('user_id', Auth::id())
->get();
return view('transactions', ['transactions' => $transactions]);
}
View:
#foreach($transactions as $transaction)
echo $transaction->product_id; //attribute product_id of transaction
echo $transaction->product->id; //attribute id of product
echo $transaction->product->name; //attribute name of product
#endforeach