laravel 5.5 表单验证 添加自定义验证规则

创建验证规则

php artisan make:rule checkNameUnique

//存放在 app/Rules 目录中

<?php

namespace AppRules;

use IlluminateContractsValidationRule;
use IlluminateSupportFacadesDB;

class checkNameUnique implements Rule
{
    protected $model;
    /**
     * Create a new rule instance.
     *
     * @return void
     */
    public function __construct($modelName)
    {
        $this->model = $modelName;
        DB::connection()->enableQueryLog();
    }

    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        $id = request('id');
        if(!empty($id)){
            $map[] = ['id', '<>' ,$id];
        }
        $map[] = ['is_del', '=', 1];
        $map[] = [$attribute, '=', $value];

        $res = DB::table($this->model)->where($map)->first();
        if($res){
            return false;
        }
        return true;

    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return '名称已存在';
    }
}

//验证中调用自定义验证规则
public function rules()
    {
        return [
            // 'brand_name' => 'required | unique:brands,brand_name',
            'brand_name' => ['required', new checkNameUnique('brands')],
            'brand_img' => 'image',
        ];
    }