Lumen: update records via json body - laravel

Question

I have a Laravel Lumen API. I'm seeing an issue with the update functionality.
In my controller, the code for updating an item is:
public function update(Request $request, $id)
{
$this->validate($request, [
'name' => 'required',
'description' => 'required',
'completed' => 'required',
]);
$todo = Todo::find($id);
$todo->name = $request->name;
$todo->description = $request->description;
$todo->completed = $request->completed;
$todo->save();
return response()->json(['status' => 'success']);
}
I can update the todo item using:
http://lumen-todo.app/api/51?name=test&description=test&completed=1
however was hoping I could send the parameters in a json body, like this
PUT http://lumen-todo.app/api
{
"id": 1
"name": "Test",
"description": "Test",
"completed": 1,
}
For adding items, it works via a json body, so don't understand why it does not work for updates. For info, the 'add item' controller code is here:
public function store(Request $request)
{
$this->validate($request, [
'name' => 'required',
'description' => 'required',
'completed' => 'required'
]);
$todo = new Todo();
$todo->name = $request->name;
$todo->description = $request->description;
$todo->completed = $request->completed;
$todo->save();
return response()->json(['status' => 'success']);
}

Answer 1

If you want to get the json data from request payload, validate and store it, use
public function store(Request $request)
{
$data = $request->json()->all();
$this->validate($data, [
'name' => 'required',
'description' => 'required',
'completed' => 'required'
]);
$resource = $this->model->find($id);
$resource->fill($request);
$resource->save();
return response()->json(['status' => 'success']);
}

Answer 2

Instead of doing this:
$todo = new Todo();
$todo->name = $request->name;
$todo->description = $request->description;
$todo->completed = $request->completed;
$todo->save();
Do, this:
use App\Todo;
protected $model;
public function __construct(Todo $model) {
$this->model = $model;
}
$resource = $this->model->find($id);
$resource->fill($request);
$resource->save();
Also, you can do json_decode() function to change your json params to array and use that to validate and save data.