Question

假设我们有一个名为（a，b，c，d）的输入字段数组，我们需要验证它们之间的某种关系。

为简单起见，我们假设它们都是数字，我们需要验证总和a + b大于c + d。

其他示例可以验证多个不重叠的日期范围。

我们如何定义验证规则以及哪些字段应收到错误？

已经有针对这种情况的设计模式了吗？

Answer 1

<?php 


// Laravel now has a function called `prepareForValidation` in request class
// applicable for Laravel version 5.6+. You can use that to validate :


namespace App\Http\Requests;

use App\Http\Requests\Request;

class YourCustomRequest extends Request
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'a' => 'required|numeric',
            'b' => 'required|numeric',
            'c' => 'required|numeric',
            'd' => 'required|numeric',
            // Validate if sum_a_b value is greater than sum_c_d value
            'sum_a_b' => 'gt:sum_c_d'
        ];
    }


    protected function prepareForValidation()
    {
        // Add new fields with values representing the sums
        $request->merge([
            'sum_a_b' => $this->input('a') + $this->input('b'),
    }
}


// And then in your controller's post action

public function store(YourCustomRequest $request)
{
    // Do actions when vaidation is successful
}

如何在Laravel中验证输入一致性（或字段之间的关系/字段组合）？

1 个答案: