Method save does not exist laravel - sql

Question

i'am trying to change the satuts in database with clicking on button , so i got this error :
Method Illuminate\Support\Collection::save does not exist.
this is the controller :
public function completedUpdate(Request $request, rendezvous $rdv )
{
$data = DB::table('rdv')->get();
foreach($data as $rdv) {
if ( $rdv->Etat_de_rdv == 'en_attente' ) {
DB::table('rdv')->where('Etat_de_rdv','en_attente')->update(['Etat_de_rdv' => 'Accepter']);
}
}
$data->Etat_de_rdv = $request->changeStatus;
$data->save();
return redirect()->back()->with('message', 'Status changed!');
}
this is the view :
#foreach($pat as $lo)
#if ($lo->IDD== $med->ID)
<h3> {{ $lo->Nom_et_prénom }} </h3>
<p>{{ $lo->Numéro_de_téléphone }}</p>
<p>{{ $lo->date}}</p>
<p>{{ $lo->time }}</p>
#if($lo->Etat_de_rdv == "en_attente")
<form action="{{ route('completedUpdate', $lo->id) }}" method="POST">
{{ csrf_field() }}
<button type="submit" class="btn btn-success" name="changeStatus" value="Accepter">Active</button>
</form>
#else
<form action="{{ route('completedUpdate', $lo->id) }}" method="POST">
{{ csrf_field() }}
<button type="submit" class="btn btn-default" name="changeStatus" value="Charger">Inactive</button>
</form>
and this is the route :
Route::post('/completedUpdate/{id}', 'rendezv#completedUpdate')->name('completedUpdate');

Answer 1

Model::create is a simple wrapper around $model = new MyModel(); $model->save()
A raw DB::table query builder isn't an Eloquent model and thus doesn't have those automatic parameters.
An example of insert data in a DB like :
DB::table('users')->insert( ['email' => 'john#example.com', 'votes' => 0] );
Using get() returns a Collection. Despite the fact you are passing in a 'unique' ID, the id, it will still return a collection. The collection will simply have one element in it.
Subsequently, your code will not work as you have experienced, or at least not without a few changes to make $data reference the first element in the collection.
$data = DB::table('rdv')->get(); // <= error here
foreach($data as $rdv) {
if ( $rdv->Etat_de_rdv == 'en_attente' ) { // <= also an error
DB::table('rdv')->where('Etat_de_rdv','en_attente')->update(['Etat_de_rdv' => 'Accepter']);
}
}
$data->Etat_de_rdv = $request->changeStatus;
$data->save(); // <= there are no save method on query builder
Here is an example how the save() method works with Model :
$id = 1;
$data = Rdv::find($id);
$data->Etat_de_rdv = $request->changeStatus;
$data->save();