public function edit($id)
 {
     $view = Auth::user()->getView();
     $provinces = Province::all();
     $cantons = Canton::all();
     $districts = District::all();
     $viability = Viability::findOrFail($id);
     return view('viabilities.edit', compact('viability', 'provinces', 'cantons', 'districts', 'view'));
 }