Using the Laravel Validator, make a field required if another field is set to a given attribute.

readme.md

Setup

• Add this file to application/libraries (or, if you are already extending the Validator class, add the contents there).
• Remove Validator alias from config/application.php in order to avoid conflicts.
• Add "required_if_attribute" => "The :attribute field is required." to application/language/[language]/validation.php.

Usage

Define the rule using:

required_if_attribute:[field],[operator],[value]

For example:

$rules = array(
    'uses_framework' => 'required',
    'preferred_framework' => 'required_if_attribute:uses_framework,==,1'
);

Supported operators

• ==
• !=
• ===
• !==
• <
• <=

• =

This is, of course, easily extended.

validator.php

<?php




	/**
	 * Validator
	 *
	 * Extending the Laravel Validator class allows us to define more powerful validation functions than
	 * with the Validator::register method.
	 */
	class Validator extends Laravel\Validator {
	
	
	
	
		/**
		 * Implicit Attributes
		 *
		 * Attributes with these rules will be validated even if no value is supplied.
		 */
		protected $implicit_attributes = array(
			'required',
			'accepted',
			'required_if_attribute'
		);
	
	
	
	
		/**
		 * Implicit
		 *
		 * By default Laravel will only validate an attribute if a value was supplied, or if the rule set is 'required' or 'accepted'.
		 * It'll just skip the validation, which makes 'require' being conditional impossible. Let's overwrite that to be more flexible.
		 */
		protected function implicit($rule) {
			return (in_array($rule, $this->implicit_attributes));
		}




		/**
		 * Required if attribute
		 *
		 * Validate that a required attribute exists, only if another
		 * attribute satisfies the supplied conditions.
		 *
		 * i.e. 'What is your favourite PHP framework?' is only required if
		 * 'Do you use a framework?' is set to '1'.
		 */
		public function validate_required_if_attribute($attribute, $value, $parameters) {
		
			$required = false;
		
			switch($parameters[1]) {
			
				case '==':
					$required = $this->attributes[$parameters[0]] == $parameters[2];
					
				case '!=':
					$required = $this->attributes[$parameters[0]] != $parameters[2];
				
				case '===':
					$required = $this->attributes[$parameters[0]] === $parameters[2];
				
				case '!==':
					$required = $this->attributes[$parameters[0]] !== $parameters[2];
					
				case '<':
					$required = $this->attributes[$parameters[0]] < $parameters[2];
					
				case '<=':
					$required = $this->attributes[$parameters[0]] <= $parameters[2];
					
				case '>':
					$required = $this->attributes[$parameters[0]] > $parameters[2];
					
				case '>=':
					$required = $this->attributes[$parameters[0]] >= $parameters[2];
				
			}
			
			return $required ? $this->validate_required($attribute, $value) : true;

		}
	
	
	
	
	}




?>

Awesome, I was writing something like this from scratch for my project, then googling brought me here, nicely coded, thanks!

I think break; -s needed after all case... but great! Thanks!

@Ardakilic @PaddyHu Glad this helped you (:

Trying to make this work in Laravel 4.1 I had to change some points:

• $this->attributes to be replaced with $this->data
• Inserted breaks as it was breaking my checks
• Replaced $this->validate_required with $this->validateRequired

New code:

public function validateRequiredIfAttribute($attribute, $value, $parameters) 
{

    $required = false;

    switch($parameters[1]) 
    {

        case '==':
            $required = $this->data[$parameters[0]] == $parameters[2];
            break;
        case '!=':
            $required = $this->data[$parameters[0]] != $parameters[2];
            break;
        case '===':
            $required = $this->data[$parameters[0]] === $parameters[2];
            break;
        case '!==':
            $required = $this->data[$parameters[0]] !== $parameters[2];
            break;
        case '<':
            $required = $this->data[$parameters[0]] < $parameters[2];
            break;
        case '<=':
            $required = $this->data[$parameters[0]] <= $parameters[2];
            break;
        case '>':
            $required = $this->data[$parameters[0]] > $parameters[2];
            break;
        case '>=':
            $required = $this->data[$parameters[0]] >= $parameters[2];
            break;
    }

    return $required ? $this->validateRequired($attribute, $value) : true;

}

I'm always getting this error: Undefined property: CustomValidator::$data when trying to use this validator... I also tried $this->getAttribute($parameters[0]) but this gives me the same error...
Why is this not working with me (I'm using Laravel 4.2) ?
maybe could somebody provide an example?

Hello hansvn, in Laravel 4.1 you can use validator "required_if:field,value"

Very useful. Thanks! The switch-case is missing break statements though ;)

What About in 4.2? Thank a lot.

Glad it is now covered in Laravel by default: required_if:field,value