public function destroy($id, Request $request)
 {
     $workflow = Workflow::findOrFail($id);
     WorkflowNode::destroy($workflow->nodes()->lists('id')->all());
     $workflow->delete();
     if ($request->ajax()) {
         return response()->json();
     }
     return redirect()->back();
 }
 public function create()
 {
     $workflows = Workflow::all();
     return view('checklists.create', compact('workflows'));
 }