Laravel : no errors and no update on database happens after saving the edit

I have two tables user and technicien with one to one connection. After editing technicien information through edit form and saving no update happens on database and no errors as well.Here is my code Could anyone help me with this please ? Thank you

controllers

public function edit($id)
{
    $technicien=technicien::find($id);
    $user = $technicien->user;
    return view('technicien.edit',['technicien'=>$technicien])->with('user',$user);
}

public function update(Request $request, $id)
{
    // do some request validation

    $technicien=technicien::find($id);
    $technicien->update($request->all());
    $technicien->user->update($request->get('user'));
    $user->nom = $request->update('nom');

    return redirect('/technicien');
}

View

@extends('Layouts/app')
@extends('Layouts.master')
@section('content')
<div class="container">
    <div class="row">
        <div class="col-md-10">
            <h1>Modifier Technicien</h1>
        <form action="" method="update">
        
        


             <div class="form-group">
            <label for="nom">Nom</label>
            <input id="nom" type="text" class="form-control" name="user[nom]" value="" >
        </div>
        <div class="form-group">
            <label for="prenom">Prenom</label>
            <input id="prenom" type="text" class="form-control" name="user[prenom]" value="" >
        </div>
        <div class="form-group">
            <label for="prenom">Email</label>
            <input id="prenom" type="text" class="form-control" name="user[email]" value="" >
        </div>

        <div class="form-group">
            <label for="">moyenne Avis</label>
            <input type="text"  name="moyenne_avis" class="form-control" value ="" >
        </div>
        <div class="form-group">
            <label for="">Etat Technicien</label>
            <input type="text"  name="actif" class="form-control" value ="" >
        </div>

        <div class="form-group">
            <input type="submit" value="enregistrer" class="form-control btn btn-primary">
        </div>
            </div>




        </form>
    </div>
</div>
@endsection

route.php

Route::get('/technicien/{id}/edit', 'TechnicienController@edit');
Route::patch('/technicien/{id}', 'TechnicienController@update')-
>name('technicien.update');

via Chebli Mohamed