How to calculate sum for belongsTo model laravel - php

Question

I need to get sum of amount for belongsTo model on laravel
Here is my code
Controller:
$users = AffiliationUser::whereAffiliationId(Auth::user()->id)
->with(['user' => function ($q){
$q->withCount(['billings'])->with(['affiliation_transactions']);
}])
->paginate(3);
//dd($users);
return view('affiliation.users', [
'users' => $users,
'current_balance' => 0,
]);
AffiliationUser model:
public function user() {
return $this->belongsTo('App\Models\Users');
}
User model:
public function billings() {
return $this->hasMany('App\Models\UserBillingSchedules', 'user_id');
}
public function affiliation_transactions() {
return $this->hasMany('App\Models\AffiliationTransaction', 'user_id');
}
View:
#foreach ($users as $user)
<tr class="even pointer">
<td class="a-center ">{{ $user->user->id }}</td>
<td class=" ">{{ $user->user->email }}</td>
<td class=" ">{{ $user->user->card_holder }}</td>
<td class=" ">{{ $user->user->billings_count }}</td>
<td class=" ">{{ $user->user->affiliation_transactions->sum('amount') }}</td>
</tr>
#endforeach
It is working good for me, but i don't like idea to get it on view.
{{ $user->user->affiliation_transactions->sum('amount') }}
Which one solution i can use also?

Answer 1

You can calculate the sum with withCount():
$users = AffiliationUser::whereAffiliationId(Auth::user()->id)
->with(['user' => function ($q) {
$q->withCount([
'billings',
'affiliation_transactions as amount' => function ($q) {
$q->select(DB::raw('coalesce(sum(amount), 0)'));
}
]);
}])
->paginate(3);
{{ $user->user->amount }}

Answer 2

Laravel allows you to create custom attributes (using the get[attributename]Attribute method in your Models easily which can be used to reduce the amount of code you need to write. In this case, you can do this:
User Model:
public function getTransactionCountAttribute() {
return $this->affiliation_transactions->sum('amount');
}
Now this can be acccessed with the following method in your code:
$user->user->transaction_count
Also, here's a little more information about Mutators, as these are named. Hope they can be useful to you :)

Answer 3

In User Model create a method like:
public function sum_amount() {
return this.affiliation_transactions->sum('amount');
}
then in your view...
{{ $user->user->sum_amount }}