Laravel 5与刀片中查询的模型关系

Question

Schema User Table

ID|NAME
1 |John
2 |Doe

Schema Financial Table

ID|USER_ID|PROFIT |DATE
1 |1      |1000   |2016-12-22
2 |2      |-2000  |2016-12-22
3 |1      |2000   |2016-12-24
4 |2      |-2000  |2016-12-24

User Model

class User extends Model
{
    public function Financial()
    {
        return $this->hasMany('App\Financial');
    }
}

Financial Model

class Financial extends Model
    {
        public function financial()
        {
            return $this->belongsTo('App\User');
        }
    }

My Controller

class MyController extends Controller
{
    public function index()
    {
        $user = User::get();
        $financial = Financial::get();
        return view('page.index',compact('user','financial'));
    }
}

My Blade

@foreach ($user as $u)
    <tr>
        <td>{{$u->id}}</td>
        <td>
             {{$u->financial->sum('gross')}}
             {{-- Above code doesn't work --}}
             {{-- Run something link --}}
             {{select (sum(profit) as total) from financial where user_id = $u->id}}
        </td>
    </tr>
@endforeach

QUESTION

How can i achieve that select from my blade? i'm planning to use @inject('DB','Illuminate\\Support\\Facades\\DB') so i can use DB::raw in my blade, but i'm confused on how to execute the query to achieve the select :(

Answer 1

Solved by using Laravel Collection Method Pluck and Laravel Blade Service Injection .Below is the code i've done to archive what i want:

@inject('financial','App\Financial') {{-- inject before foreach --}}
@foreach ($user as $u)
    <tr>
        <td>{{$u->id}}</td>
        <td>{{$financial->where('user_id','=',$u->id)->get()->pluck('profit')->sum()}}</td>
    </tr>
@endforeach

To Evaluate what happen:

$financial->where('user_id','=',$u->id)->pluck('profit')->sum()
//   get financial where user_id = $u->id   // get the profit // sum the profit 

Cheers!

Answer 2

You could have simply done this:

{{$u->financial()->sum('gross')}}

If you are running a query on a relationship, add function brackets while calling it.