如何使用 pluck 从 Laravel 中的其他表中获取特定数据？

Question

From SalesController , I want to get specific name from table Item and passed to HTML.

My controller looks like

public function index()
{
    $items=Item::orderBy('name','ASC')->get()->pluck('name','id');
    $sales=Sale::all();
    return view('Sale.index')->with('sales',$sales,'items',$items);
}

My HTML is

<thead>
    <tr>
        <th>No</th>
        <th>Name</th>
        <th>Quantity</th>
        <th>Total Price</th>
        <th>Detail</th>
    </tr>
</thead>
<tbody>
    @foreach($sales as $sale)
        <tr>
            <td>{{ $sale->id }}</td>
            <td>{{ $sale->items->name }}</td>
            <td>{{ $sale->quantity }}</td>
            <td>RM {{ $sale->price }}</td>
            <td>{{ $sale->created_at }}</td>
        </tr>
    @endforeach
</tbody>

But I get the following error after trying to access the page:

Trying to get property 'name' of non-object (View: C:\xampp\htdocs\inventoryApp\resources\views\Sale\index.blade.php)

Answer 1

there are two way

1.Using relationship

class Sale extends Model
{
    public function item()
    {
        return $this->belongsTo('App\Item','item_id','id');
    }

}

so you can use like below

<td>{{ $sale->item->name }}</td>

2. Using array data

public function index()
{
     $items=Item::orderBy('name','ASC')->pluck('name','id')->toArray();
     $sales=Sale::all();
     return view('Sale.index')->with('sales',$sales,'items',$items);
 }



<td>{{ $items[$sale->item_id] }}</td>

Answer 2

$items=Item::orderBy('name','ASC')->pluck('name','id');

and use $items directly without sale object

Answer 3

If you have relationship with table Sale.

Add this function to your Sale Class.

public function item()
{
    return $this->belongsTo('App\Item');
}

In your controller you can use compact

public function index()
{
    $items=Item::orderBy('name','ASC')->get();
    $sales=Sale::all();
    return view('Sale.index')->compact('sales','items');
}

And you can use Eager load to your HTML.

<tbody>
            @foreach($sales as $sale)
                <tr>
                    <td>{{ $sale->id }}</td>
                    <td>{{ $sale->item->name }}</td>
                    <td>{{ $sale->quantity }}</td>
                    <td>RM {{ $sale->price }}</td>
                    <td>{{ $sale->created_at }}</td>
                </tr>
            @endforeach
        </tbody>

Answer 4

You are getting this error because you are trying to get a property of item name that does not exist on the sale object. you can simply do it by eloquent relationship as follows: On your sale model:

public function item()
{
    return $this->belongsTo('App\Item','item_id');
}

On your controller:

public function index()
{
     $sales=Sale::all();
     return view('Sale.index',compact('sales'));
}

Then on your blade you can easily get related Item name:

@foreach($sales as $sale)
    <tr>
        <td>{{ $sale->item->name }}</td>
    </tr>
@endforeach