How add Custom Validation Rules when using Form Re

问题:

I am using form request validation method for validating request in laravel 5.I would like to add my own validation rule with form request validation method.My request class is given below.I want to add custom validation numeric_array with field items.

  protected $rules = [
      'shipping_country' => ['max:60'],
      'items' => ['array|numericarray']
];

My cusotom function is given below

 Validator::extend('numericarray', function($attribute, $value, $parameters) {
            foreach ($value as $v) {
                if (!is_int($v)) {
                    return false;
                }
            }
            return true;
        });

How can use this validation method with about form request validation in laravel5?

回答1:

Using Validator::extend() like you do is actually perfectly fine you just need to put that in a Service Provider like this:

<?php namespace App\Providers;

use Illuminate\Support\ServiceProvider;

class ValidatorServiceProvider extends ServiceProvider {

    public function boot()
    {
        $this->app['validator']->extend('numericarray', function ($attribute, $value, $parameters)
        {
            foreach ($value as $v) {
                if (!is_int($v)) {
                    return false;
                }
            }
            return true;
        });
    }

    public function register()
    {
        //
    }
}

Then register the provider by adding it to the list in config/app.php:

'providers' => [
    // Other Service Providers

    'App\Providers\ValidatorServiceProvider',
],

You now can use the numericarray validation rule everywhere you want

回答2:

While the above answer is correct, in a lot of cases you might want to create a custom validation only for a certain form request. You can leverage laravel FormRequest and use dependency injection to extend the validation factory. I think this solution is much simpler than creating a service provider.

Here is how it can be done.

use Illuminate\Validation\Factory as ValidationFactory;

class UpdateMyUserRequest extends FormRequest {

    public function __construct(ValidationFactory $validationFactory)
    {

        $validationFactory->extend(
            'foo',
            function ($attribute, $value, $parameters) {
                return 'foo' === $value;
            },
            'Sorry, it failed foo validation!'
        );

    }

    public function rules()
    {
        return [
            'username' => 'foo',
        ];
    }
}

回答3:

The accepted answer works for global validation rules, but many times you will be validating certain conditions that are very specific to a form. Here's what I recommend in those circumstances (that seems to be somewhat intended from Laravel source code at line 75 of FormRequest.php):

Add a validator method to the parent Request your requests will extend:

<?php namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use Validator;

abstract class Request extends FormRequest {

    public function validator(){

        $v = Validator::make($this->input(), $this->rules(), $this->messages(), $this->attributes());

        if(method_exists($this, 'moreValidation')){
            $this->moreValidation($v);
        }

        return $v;
    }
}

Now all your specific requests will look like this:

<?php namespace App\Http\Requests;

use App\Http\Requests\Request;

class ShipRequest extends Request {

    public function rules()
    {
        return [
            'shipping_country' => 'max:60',
            'items' => 'array'
        ];
    }

    // Here we can do more with the validation instance...
    public function moreValidation($validator){

        // Use an "after validation hook" (see laravel docs)
        $validator->after(function($validator)
        {
            // Check to see if valid numeric array
            foreach ($this->input('items') as $item) {
                if (!is_int($item)) {
                    $validator->errors()->add('items', 'Items should all be numeric');
                    break;
                }
            }
        });
    }

    // Bonus: I also like to take care of any custom messages here
    public function messages(){
        return [
            'shipping_country.max' => 'Whoa! Easy there on shipping char. count!'
        ];
    }
}

回答4:

You need to override getValidatorInstance method in your Request class, for example this way:

protected function getValidatorInstance()
{
    $validator = parent::getValidatorInstance();
    $validator->addImplicitExtension('numericarray', function($attribute, $value, $parameters) {
        foreach ($value as $v) {
            if (!is_int($v)) {
                return false;
            }
        }
        return true;
    });

    return $validator;
}

回答5:

You don't need to extend the validator to validate array items, you can validate each item of a array with "*" as you can see in Array Validation

protected $rules = [
      'shipping_country' => ['max:60'],
      'items' => ['array'],
      'items.*' => 'integer'
];

回答6:

Custom Rule Object

One way to do it is by using Custom Rule Object, this way you can define as many rule as you want without need to make changes in Providers and in controller/service to set new rules.

php artisan make:rule NumericArray

In NumericArray.php

namespace App\Rules;
class NumericArray implements Rule
{
   public function passes($attribute, $value)
   {
     foreach ($value as $v) {
       if (!is_int($v)) {
         return false;
       }
     }
     return true;
   }


  public function message()
  {
     return 'error message...';
  }
}

Then in Form request have

use App\Rules\NumericArray;
.
.
protected $rules = [
      'shipping_country' => ['max:60'],
      'items' => ['array', new NumericArray]
];

回答7:

For me works the solution that give us lukasgeiter, but with a difference that we create a class with our custom validations ,like this, for laravel 5.2.* The next example is for add a validation to a range of date in where the second date has to be equals or more big that the first one

In app/Providers create ValidatorExtended.php

<?php
namespace App\Providers;
use Illuminate\Validation\Validator as IlluminateValidator;

class ValidatorExtended extends IlluminateValidator {

private $_custom_messages = array(
 "after_or_equal" => ":attribute debe ser una fecha posterior o igual a 
 :date.",
);

public function __construct( $translator, $data, $rules, $messages = array(),      
$customAttributes = array() ) {
  parent::__construct( $translator, $data, $rules, $messages, 
  $customAttributes );
  $this->_set_custom_stuff();
}

protected function _set_custom_stuff() {
   //setup our custom error messages
  $this->setCustomMessages( $this->_custom_messages );
}

/**
 * La fecha final debe ser mayor o igual a la fecha inicial
 *
 * after_or_equal
 */
protected function validateAfterOrEqual( $attribute, $value, $parameters, 
$validator) {
   return strtotime($validator->getData()[$parameters[0]]) <= 
  strtotime($value);
}

}   //end of class

Ok. now lets create the Service Provider. Create ValidationExtensionServiceProvider.php inside app/Providers, and we code

<?php
namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Validator;

class ValidationExtensionServiceProvider extends ServiceProvider {

public function register() {}

public function boot() {
  $this->app->validator->resolver( function( $translator, $data, $rules, 
  $messages = array(), $customAttributes = array() ) {
    return new ValidatorExtended( $translator, $data, $rules, $messages, 
    $customAttributes );
} );
}

}   //end of class

Now we to tell Laravel to load this Service Provider, add to providers array at the end in config/app.php and

//Servicio para extender validaciones
App\Providers\ValidationExtensionServiceProvider::class,

now we can use this validation in our request in function rules

public function rules()
{
  return [
    'fDesde'     => 'date',
    'fHasta'     => 'date|after_or_equal:fDesde'
 ];
}

or in Validator:make

$validator = Validator::make($request->all(), [
    'fDesde'     => 'date',
    'fHasta'     => 'date|after_or_equal:fDesde'
], $messages);

you have to notice that the name of the method that makes the validation has the prefix validate and is in camel case style validateAfterOrEqual but when you use the rule of validation every capital letter is replaced with underscore and the letter in lowercase letter.

All this I take it from https://www.sitepoint.com/data-validation-laravel-right-way-custom-validators// here explain in details. thanks to them.

回答8:

All answers on this page will solve you the problem, but... But the only right way by the Laravel conventions is solution from Ganesh Karki

If you want to create validation by Laravel conventions follow this tutorial. It is easy and very well explained. It helped me a lot.

Tutorial link