error: “Creating default object from empty value”

Question

I am following a tutorial that shows how to connect to MySql using laravel, but while trying to update the values I ran into an error, I did try to find something similar but failed at that. The answers I found said that the object must be empty, but if I'm updating an existing values it's not empty. A tutorial I am following https://www.webslesson.info/2018/01/insert-update-delete-in-mysql-table-laravel-tutorial.html

So I have a form that displays the data from database in a file index.blade.php with a edit, a form that displays specific user data in a fine edit.blade.php and the methods in StudentController.php file.

They look like this:

Table of the user data and the edit button index.blade.php

       <table class="table table-bordered">
            <tr>
                <th>First name</th>
                <th>Last name</th>
                <th>Edit</th>
                <th>Delete</th>
            </tr>
            @foreach($students as $row)
                <tr>
                    <th>{{$row['name']}}</th>
                    <th>{{$row['surname']}}</th>
                    <th><a href="{{action('StudentController@edit', $row['id'])}}" class="btn btn-primary">Edit</a></th>
                    <th></th>
                </tr>
            @endforeach
        </table>

Form in the edit.blade.php file

      <form action="{{action('StudentController@update','$id')}}" method="post">
            {{csrf_field()}}
            <input type="hidden" name="_method" value="PATCH">
            <div class="form-group">
                <input type="text" name="name" class="form-control" value="{{$student->name}}" placeholder="Enter first name">
            </div>
            <div class="form-group">
                <input type="text" name="surname" class="form-control" value="{{$student->surname}}" placeholder="Enter last surname">
            </div>
            <div>
                <input type="submit" class="btn btn-primary" value="Edit">
            </div>

        </form>

And the methods in the Student.Controller.php file

public function update(Request $request, $id)
{
    $this->validate($request, [
        'name'=> 'required',
        'surname'=> 'required'
    ]);
    $student = Student::find($id);
    $student->name=$request->get('name');
    $student->surname=$request->get('surname');
    $student->save();
    return redirect()->route('students.index')->with('success', 'Data Updated');
}

I get the error in StudentController.php file in the line: $student->name=$request->get('name');

Check whether your getting the values in the $request by using var_dump — Channaveer Hakari
– Channaveer Hakari, Commented Aug 8, 2018 at 16:29
check the edit.blade.php html source code, '$id' should be $id — kenken9999
– kenken9999, Commented Aug 8, 2018 at 16:55
what happen if change $request->get() to $request->input(), or you try dd($request->get('name')) — kenken9999
– kenken9999, Commented Aug 8, 2018 at 17:00
@kenken9999i changed to to input and now it works, not sure why, but thank you I guess :D — Aina
– Aina, Commented Aug 8, 2018 at 17:09

Devon Bessemer · Accepted Answer · 2018-08-08 16:28:40Z

3

You aren't verifying that a student was actually found. If there is no record found, find will return null.

A common practice is to use findOrFail and let Laravel throw an exception if a record with $id is not found.

$student = Student::findOrFail($id);

Or you can handle it yourself:

$student = Student::find($id);
if (!$student) {
    return response(['error' => 'No student found']);
}

answered Aug 8, 2018 at 16:28

Devon Bessemer

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5 Comments

Aina Over a year ago

Yes, now I can see that no student has been found, but I don't really understand how. The table at the beginning shows only the saved students and the edit button passes that student id to the edit method. Am I passing the id incorrectly?

Aina Over a year ago

I changed $request->get() to $request->input() and now it works, but thank you for showing me that I was not verifying that a student exists. I will use that aswell.

Devon Bessemer Over a year ago

That doesn't really have anything to do with your error. The way you are using get/input are interchangeable, they both will do the same thing.

Aina Over a year ago

well, then I guess changes in the edit.blade.php HTML source code, '$id' to $id, solved my problem.

Devon Bessemer Over a year ago

Yeah, that'd definitely cause it since there would be no literal $id record in your db. Variables aren't parsed in single quotes.

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