根据输入值从 MYSQL 数据库检索值列表(LARAVEL 10 )(GET HTTP METHOD)

Question

我对 PHP 和 laravel 相当陌生，所以寻求一些帮助。

例如，我在 mySQL 数据库中有一个表，用于存储用户的评论。该表的值为 userId、bookId 和 Comment。我本质上想在我的控制器中构建一个函数，它将检索特定 bookId 的评论列表。因此，如果 bookId 'cm123' 对该书总共有 7 条评论，那么我的函数应该使用 HTTP GET 请求检索所有 7 条评论。该路由严格进入 API 路由，我们没有为此使用任何视图，因此不需要表单等输入 - 而是在 Postman 中测试请求时手动输入参数。

再次强调，我想要的最终结果是，给定特定的 bookId 输入，API 返回存储在数据库中的图书评论列表

下面是我的模型、路线和控制器类（我已经有一个名为“SHOW”的函数，但它不起作用）：

控制器

<?php

namespace App\Http\Controllers;

use App\Models\CreateComment;
use App\Models\BookRating;
use Illuminate\Http\Request;


class BookRatingController extends Controller
{
    
  

    /**
     * Display the specified resource.
     */
    public function show(string $bookId): View
    {
        return view('CreateComment.Comment', [
            'Comment' => CreateComment::findOrFail($bookId)
        ]);
    } // return list of comments
    
        

型号

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class CreateComment extends Model
{

    use HasFactory;

    protected $fillable =
    [
        'Comment',
        'userId',
        'bookId'
    ];
}

路线

<?php

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Route;
use App\Http\Controllers\BookRatingController;
use App\Http\Models\BookRating;
use App\Http\Models\CreateComment;

/*
|--------------------------------------------------------------------------
| API Routes
|--------------------------------------------------------------------------
|
| Here is where you can register API routes for your application. These
| routes are loaded by the RouteServiceProvider and all of them will
| be assigned to the "api" middleware group. Make something great!
|
*/

Route::middleware('auth:sanctum')->get('/user', function (Request $request) {
    return $request->user();
});

Route::post('CreateRating',[BookRatingController::class, 'CreateRating']);//adding a bookrating to database API -- POST METHOD-- 
Route::post('CreateComment',[BookRatingController::class, 'CreateComment']);

Route::get('show/{$bookId}',[BookRatingController::class,'show']);

Answer 1

要实现上述功能，首先在routes/api.php中创建如下路由

use App\Http\Controllers\CommentController;

Route::get('comments/{bookId}', [CommentController::class, 'show']);

然后在CommentController的show函数中修改如下函数

public function show(Request $request, string $bookId)
    {
        // Retrieve comments based on the provided bookId
        $comments = CreateComment::where('bookId', $bookId)->get();

        // Check if comments exist for the given bookId
        if ($comments->isEmpty()) {
            // Return appropriate response if no comments found
            return response()->json(['message' => 'No comments found for the specified bookId'], 404);
        }

        // Return comments as JSON response
        return response()->json($comments);
    }