validate([ 'display_name' => ['required', 'string', 'max:255'], ]); $participant = $dynamic->participants()->where('user_id', $request->user()->id)->firstOrFail(); $dynamic->participants()->updateExistingPivot($participant->id, [ 'display_name' => $request->input('display_name'), ]); return redirect()->back()->with('success', 'Display name updated successfully!'); } }