LaravelValidation怎么进行数据验证_LaravelValidation验证规则

use Illuminate\Http\Request;

class PostController extends Controller
{
    public function store(Request $request)
    {
        // 直接在请求实例上调用validate方法
        // 如果验证失败，Laravel会自动处理错误信息并重定向回上一页
        // 对于API请求，则会返回JSON格式的错误响应
        $validatedData = $request->validate([
            'title' => 'required|unique:posts|max:255',
            'body' => 'required',
            'publish_at' => 'nullable|date',
        ]);

        // 验证通过，数据合法，可以继续处理业务逻辑
        // 例如：创建新的Post
        // Post::create($validatedData);

        return redirect('/posts')->with('success', '文章创建成功！');
    }
}

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;

class UserController extends Controller
{
    public function update(Request $request, $id)
    {
        $validator = Validator::make($request->all(), [
            'name' => 'required|string|max:255',
            'email' => 'required|email|unique:users,email,' . $id, // 忽略当前用户ID的邮箱
            'password' => 'sometimes|min:8|confirmed', // sometimes表示只有当字段存在时才验证
        ]);

        if ($validator->fails()) {
            return redirect('user/' . $id . '/edit')
                        ->withErrors($validator)
                        ->withInput();
        }

        // 验证通过，更新用户数据
        // User::find($id)->update($validator->validated());

        return redirect('/users')->with('success', '用户信息更新成功！');
    }
}

// app/Http/Requests/StorePostRequest.php
namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class StorePostRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     */
    public function authorize(): bool
    {
        // 这里可以定义用户是否有权限执行此操作的逻辑
        // 例如：return auth()->user()->can('create', Post::class);
        return true; // 暂时允许所有用户
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
     */
    public function rules(): array
    {
        return [
            'title' => 'required|unique:posts|max:255',
            'body' => 'required',
            'publish_at' => 'nullable|date',
        ];
    }

    /**
     * 自定义错误消息
     */
    public function messages(): array
    {
        return [
            'title.required' => '文章标题是必填的。',
            'title.unique' => '这个标题已经有人用过了，换一个吧。',
            'body.required' => '文章内容不能为空。',
        ];
    }
}

// app/Http/Controllers/PostController.php
use App\Http\Requests\StorePostRequest;

class PostController extends Controller
{
    public function store(StorePostRequest $request)
    {
        // 验证逻辑已经由StorePostRequest处理，如果验证失败，会自动重定向或返回JSON
        // 只有当验证成功时，这里的代码才会被执行
        $validatedData = $request->validated();

        // Post::create($validatedData);

        return redirect('/posts')->with('success', '文章创建成功！');
    }
}

php artisan make:rule CustomUniqueApplication

namespace App\Rules;

use Closure;
use Illuminate\Contracts\Validation\ValidationRule;
use App\Models\Application; // 假设你的申请模型

class CustomUniqueApplication implements ValidationRule
{
    protected $userId;
    protected $applicationType;

    public function __construct($userId, $applicationType)
    {
        $this->userId = $userId;
        $this->applicationType = $applicationType;
    }

    /**
     * Run the validation rule.
     *
     * @param  \Closure(string): \Illuminate\Translation\PotentiallyTranslatedString  $fail
     */
    public function validate(string $attribute, mixed $value, Closure $fail): void
    {
        // 检查用户在当月内是否已经提交了三次相同类型的申请
        $count = Application::where('user_id', $this->userId)
                            ->where('type', $this->applicationType)
                            ->whereMonth('created_at', now()->month)
                            ->whereYear('created_at', now()->year)
                            ->count();

        if ($count >= 3) {
            $fail('您本月提交此类申请的次数已达上限。');
        }
    }

    // 如果需要更复杂的错误消息，可以在这里定义
    // public function message()
    // {
    //     return '您本月提交此类申请的次数已达上限。';
    // }
}

use App\Rules\CustomUniqueApplication;

class ApplicationController extends Controller
{
    public function store(Request $request)
    {
        $userId = auth()->id(); // 获取当前用户ID
        $applicationType = $request->input('type');

        $request->validate([
            'title' => ['required', 'string', 'max:255'],
            'type' => ['required', 'string'],
            'description' => ['required', 'string'],
            // 使用自定义规则对象
            'type' => [new CustomUniqueApplication($userId, $applicationType)],
        ]);

        // ... 处理通过验证的申请 ...
    }
}

// app/Providers/AppServiceProvider.php
namespace App\Providers;

use Illuminate\Support\Facades\Validator;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     */
    public function register(): void
    {
        //
    }

    /**
     * Bootstrap any application services.
     */
    public function boot(): void
    {
        Validator::extend('foo_bar', function ($attribute, $value, $parameters, $validator) {
            // 自定义验证逻辑
            // 例如：检查值是否包含 "foo" 且不包含 "bar"
            return str_contains($value, 'foo') && ! str_contains($value, 'bar');
        });

        // 你也可以定义自定义错误消息
        Validator::replacer('foo_bar', function ($message, $attribute, $rule, $parameters) {
            return str_replace(':attribute', $attribute, 'The :attribute field must contain "foo" and not "bar".');
        });
    }
}

$request->validate([
    'my_field' => 'required|foo_bar',
]);

<!-- resources/views/posts/create.blade.php -->

@if ($errors->any())
    <div class="alert alert-danger">
        <ul>
            @foreach ($errors->all() as $error)
                <li>{{ $error }}</li>
            @endforeach
        </ul>
    </div>
@endif

<form method="POST" action="/posts">
    @csrf
    <div>
        <label for="title">标题:</label>
        <input type="text" id="title" name="title" value="{{ old('title') }}">
        <!-- 显示特定字段的错误信息 -->
        @error('title')
            <div class="text-danger">{{ $message }}</div>
        @enderror
    </div>
    <div>
        <label for="body">内容:</label>
        <textarea id="body" name="body">{{ old('body') }}</textarea>
        @error('body')
            <div class="text-danger">{{ $message }}</div>
        @enderror
    </div>
    <button type="submit">提交</button>
</form>

{
    "message": "The given data was invalid.",
    "errors": {
        "title": [
            "The title field is required."
        ],
        "body": [
            "The body field is required."
        ]
    }
}