Conditional validation in Laravel - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is conditional validation in Laravel?

Conditional validation in Laravel means applying validation rules only when certain conditions are met. It helps to validate data dynamically based on other input values.

beginner

How do you apply a validation rule only if another field has a specific value?

You can use the required_if rule. For example, 'field2' => 'required_if:field1,value' means field2 is required only if field1 equals value.

intermediate

What Laravel method allows you to add validation rules conditionally in a fluent way?

The sometimes method lets you add rules only when a condition is true. For example, $validator->sometimes('field', 'rule', fn() => condition).

intermediate

Explain the difference between required_if and sometimes in Laravel validation.

required_if is a rule that makes a field required based on another field's value. sometimes is a method to apply rules only when a condition is true, giving more control over when validation runs.

beginner

How can you validate a field only if another field is present in the request?

Use the required_with rule. For example, 'field2' => 'required_with:field1' means field2 is required only if field1 is present in the input.

Which Laravel validation rule makes a field required only if another field equals a specific value?

A nullable

B sometimes

C required_with

D required_if

required_if makes a field required only when another field has a given value.

What does the sometimes method do in Laravel validation?

A Applies rules only when a condition is true

B Always applies validation rules

C Skips validation completely

D Makes a field optional

sometimes applies validation rules only if a given condition is true.

Which rule requires a field only if another field is present in the input?

A required_with

B required_if

C required_without

D sometimes

required_with requires a field only if another specified field is present.

How do you add conditional validation rules using a closure in Laravel?

A Using <code>required_if</code> with a closure

B Using <code>sometimes</code> with a closure

C Using <code>nullable</code> with a closure

D Using <code>required_with</code> with a closure

The sometimes method accepts a closure to conditionally apply rules.

What happens if you use required_if:status,active on a field?

A Field is required if status is not 'active'

B Field is always required

C Field is required only if status is 'active'

D Field is optional

The field becomes required only when the status field equals 'active'.

Describe how you would validate a form field only when another field has a specific value in Laravel.

Think about rules that depend on other fields' values.

Explain the difference between the sometimes method and the required_if rule in Laravel validation.

One is a method for adding rules conditionally, the other is a specific rule.