Custom validation rules in Laravel - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a custom validation rule in Laravel?

A custom validation rule in Laravel is a user-defined rule that lets you check data in ways not covered by Laravel's built-in validators. It helps you create specific checks for your app's needs.

beginner

How do you create a custom validation rule class in Laravel?

Use the Artisan command: <code>php artisan make:rule RuleName</code>. This creates a class where you define the <code>passes()</code> method to check the value and <code>message()</code> to return an error message.

beginner

What does the passes() method do in a Laravel custom rule?

The passes() method checks if the given value meets your custom condition. It returns true if valid, or false if invalid.

intermediate

How do you apply a custom validation rule to a form request in Laravel?

In your form request's <code>rules()</code> method, add the custom rule class instance to the field's rules array, like <code>'field' => ['required', new RuleName()]</code>.

intermediate

Can custom validation rules accept parameters? How?

Yes. You can pass parameters via the rule class constructor when creating the rule instance. Then use those parameters inside <code>passes()</code> to customize validation.

Which Artisan command creates a custom validation rule class?

A php artisan make:rule RuleName

B php artisan make:validation RuleName

C php artisan create:rule RuleName

D php artisan generate:rule RuleName

The correct command is php artisan make:rule RuleName to create a custom validation rule class.

What should the passes() method return if the value is valid?

A null

B true

C false

D an error message

The passes() method returns true if the value passes validation.

Where do you add a custom validation rule in Laravel?

A In the routes file

B In the controller's constructor

C In the form request's <code>rules()</code> method

D In the model's <code>boot()</code> method

Custom validation rules are added inside the form request's rules() method.

How do you pass parameters to a custom validation rule?

A Via the rule class constructor

B By setting global variables

C Using environment variables

D By modifying the <code>message()</code> method

Parameters are passed to custom rules through the constructor when creating the rule instance.

What does the message() method in a custom rule do?

A Checks if the value is valid

B Defines the validation logic

C Saves the validation result

D Returns the error message when validation fails

The message() method returns the error message shown if validation fails.

Explain how to create and use a custom validation rule in Laravel.

Think about the steps from creating the rule to applying it in validation.

Describe how you can customize a Laravel validation rule with parameters.

Focus on how data flows into the rule class.