Laravel Eloquent - Select all columns plus a subquery using Eloquent only - laravel-5

Question

I need to select all columns from a table and an additional columns using subquery in laravel's eloquent. For example,
SELECT *, (SELECT COUNT(*) FROM transactions WHERE transactions.customer=customers.id) AS transactions FROM customers
Right now, I have come up with using a raw query using selectRaw like:
$customers = Customer::selectRaw('*, (SELECT COUNT(*) FROM transactions WHERE transactions.customer=customers.id) AS transactions')->get();
But I'd like to do it the eloquent way, without using raw queries.

Answer 1

as i see here you have 1-N relation between customer and transaction , if you have set up your models with eloquent relationships belongTo and hasMany , then you can use the With for eager load subqueries :
Eloquent eager load and eager load count relation
//customers + transactions for each one
$customers = Customer:with('transactions')->get();
// customers + transaction count for each one
$customers = Customer:withCount('transactions')->get();
Customer Model
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Customer extends Model
{
/**
* Get the transactions for the customer.
*/
public function transactions()
{
return $this->hasMany(Transaction::class);
}
}
Transaction Model
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Transaction extends Model
{
/**
* Get the customer of this transaction.
*/
public function customer()
{
return $this->belongsTo(Customer::class);
}
}