variable showing null value in view laravel - laravel

Question

i am trying to sent data to view from function in controller but the variable view is not showing any result
public function goedit($id)
{
$catg = Category::where('cat_id',$id)->first();
return view('product.gocatedit')->with('row', $catg);
}
and my view is
#if(isset($row))
<form action="{{action('ProductController#edit')}}" method="post">
<input type="hidden" name="_token" value="{{ csrf_token() }}">
<div class="col-sm-12">
<h1 style="text-align:center;">Edit Items</h1>
<table class="table">
<thead>
<tr>
<th>ID</th>
<th>Category</th>
<th>Item</th>
<th>Price</th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<input type="hidden" name="item_id" value="{{ $row->item_id}}">
<td><input class="form-control" name="item_name" value="{{$row->item_name}}" /></td>
<td><input class="form-control" name="item_price" value="{{$row->item_price}}" /></td>
<td><input class="btn btn-primary btn-block btn-flat" type="submit" value="Edit"></td>
</tr>
</tbody>
</table>
</div>
</form>
#endif
please help thanks

Answer 1

It seems you query returning null, that's the problem (there is no such ID in a database).
If you want to check for null, use is_null:
#if(is_null($var))
Or maybe you want to use empty:
#if(!empty($row))

Answer 2

public function goedit($id)
{
$catg = Category::where('cat_id',$id)->first();
return view('product.gocatedit')->with('row', $catg);
}
practically should be:
public function goedit($id)
{
$catg = Category::findOrFail($id);
return view('product.gocatedit')->with('row', $catg);
}
and then it seems that you aren't using default primary key, which is "id", so in your model add
public class Category{
...................
protected $primaryKey = "cat_id";
.....................
}

Answer 3

If you use ->with('something', 'data'), then the data passed will be in the session('something') and it's purpose is to 'flash' messages.
You need this (view data is supposed to be passed as an array, and as a second parameter of the view() function):
public function goedit($id)
{
$catg = Category::where('cat_id',$id)->first();
return view('product.gocatedit', ['row' => $catg]);
}