Laravel中构建嵌套数组的实践指南

[
    {
        "q": "What number is the letter A in the English alphabet?",
        "a": [
            {"option": "8", "correct": false},
            {"option": "14", "correct": false},
            {"option": "1", "correct": true},
            {"option": "23", "correct": false}
        ],
        "correct": "<p><span>That's right!</span> The letter A is the first letter in the alphabet!</p>",
        "incorrect": "<p><span>Uhh no.</span> It's the first letter of the alphabet. Did you actually <em>go</em> to kindergarden?</p>"
    },
    // ... 更多问题
]

// 假设 $questions 是从数据库中获取的问题集合
foreach ($questions as $q) {
    $jsondata[] = [
        "q" => $q->content,
        "a" => [
            // 尝试在这里直接循环答案
            foreach ($q->answers as $a) {
                "option" => $a->content,
                "correct" => $a->correct,
            }
        ],
        // ... 其他字段
    ];
}

<?php

namespace App\Http\Controllers;

use App\Models\Question; // 假设你有 Question 模型
use Illuminate\Http\Request;

class QuizController extends Controller
{
    public function getQuizData()
    {
        // 从数据库获取所有问题及其关联的答案
        // 确保 Question 模型中定义了 'answers' 关系 (例如：hasMany(Answer::class))
        $questions = Question::with('answers')->get();

        $jsondata = []; // 初始化最终的JSON数据数组

        foreach ($questions as $q) {
            $adata = []; // **重要：为每个问题重置答案数组**

            // 遍历当前问题的所有答案，构建答案选项数组
            foreach ($q->answers as $a) {
                $adata[] = [
                    "option" => $a->content,
                    "correct" => (bool) $a->correct, // 确保 'correct' 是布尔类型
                ];
            }

            // 构建单个问题的数据结构
            $jsondata[] = [
                "q" => $q->content,
                "a" => $adata,
                // 假设 'correct_feedback' 和 'incorrect_feedback' 是 Question 模型上的字段
                "correct" => $q->correct_feedback ?? '',
                "incorrect" => $q->incorrect_feedback ?? '',
            ];
        }

        // 返回JSON响应
        return response()->json($jsondata);
    }
}

<?php

namespace App\Http\Controllers;

use App\Models\Question;
use Illuminate\Http\Request;

class QuizController extends Controller
{
    public function getQuizDataWithMap()
    {
        $questions = Question::with('answers')->get();

        $jsondata = $questions->map(function ($q) {
            // 使用 collection 的 map 方法处理答案
            $answers = $q->answers->map(function ($a) {
                return [
                    "option" => $a->content,
                    "correct" => (bool) $a->correct,
                ];
            })->toArray(); // 将答案 collection 转换回数组

            return [
                "q" => $q->content,
                "a" => $answers,
                "correct" => $q->correct_feedback ?? '',
                "incorrect" => $q->incorrect_feedback ?? '',
            ];
        })->toArray(); // 将主 collection 转换回数组

        return response()->json($jsondata);
    }
}