amber-laravel/app/Http/Controllers/Api/ChatController.php

<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Assistant;
use App\Models\Chat;
use Illuminate\Http\Request;

class ChatController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index(Request $request)
    {
        return $this->success(
            Chat::whereUserId($request->user('api')->id)->get()
        );
    }

    /**
     * Store a newly created resource in storage.
     */
    public function store(Request $request)
    {
        $request->validate([
            'name' => 'string|required',
            'assistant_id' => 'exists:assistants,id|required',
        ]);

        $assistant = Assistant::find($request->input('assistant_id'));

        if ($assistant->user_id !== $request->user('api')->id) {
            return $this->forbidden();
        }

        $chatModel = new Chat();

        $chat = $chatModel->create([
            'name' => $request->input('name'),
            'assistant_id' => $assistant->id,
            'user_id' => $request->user('api')->id,
        ]);

        return $this->created($chat);
    }

    /**
     * Display the specified resource.
     */
    public function show(string $id)
    {
        //
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(Request $request, string $id)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(string $id)
    {
        //
    }

    public function histories(Request $request, Chat $chat)
    {
        return $this->success(
            $chat->histories()->get()
        );
    }
}