案例

今天遇到两个情景：

• 添加用户时需要验证密码必填，但是编辑用户时不需要验证密码必填。
• 邮箱输入时需要验证邮箱格式以及表内邮箱唯一。

翻了翻手册，找到一个sometimes的验证方法
Validation - Laravel 按条件增加规则

代码

<?php

namespace App\Http\Requests\Users;


use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;

class Users extends FormRequest
{
    public function authorize()
    {
        return true;
    }

    public function rules()
    {
        return [
            'name' => 'required'
        ];
    }

    protected function getValidatorInstance()
    {
        $validator = parent::getValidatorInstance();
        $validator->sometimes('password', 'required', function ($input) {
            # 判断id，决定是否启用验证规则
            if (!isset($input->id) || empty($input->id)) {
                return $input;
            }
        });
        $validator->sometimes('repassword', 'required|same:password', function ($input) {
            if (!isset($input->id) || empty($input->id)) {
                return $input;
            }
        });
        $validator->sometimes('email', [
            'required',
            'email:rfc,dns',
            Rule::unique('users')->ignore(request('id'))->where(function ($query) {
                $query->whereNull('deleted_at');
            }),
        ], function ($input) {
            if (!isset($input->email) || empty($input->email)) {
                return $input;
            }
        });
        return $validator;
    }
}

示例参数

{
    "name": "张三",
    "password": "",
    "repassword": "",
    "email": "good@163.com"
}

返回示例

{
    "message": "The given data was invalid.",
    "errors": {
        "password": [
            "The password field is required."
        ],
        "repassword": [
            "The repassword field is required."
        ],
        "email": [
            "The email has already been taken."
        ]
    },
    "status_code": 422
}

仅记录laravel小技巧，文内验证规则均简写。