# Class Phalcon\\Validation\\Validator\\Uniqueness
# Class **Phalcon\\Validation\\Validator\\Uniqueness**
*extends* abstract class [*Phalcon\\Validation\\Validator*](#)
*implements*[*Phalcon\\Validation\\ValidatorInterface*](#)
Check that a field is unique in the related table
```
<pre class="calibre14">```
<?php
use Phalcon\Validation\Validator\Uniqueness as UniquenessValidator;
$validator->add('username', new UniquenessValidator(array(
'model' => 'Users',
'message' => ':field must be unique'
)));
Different attribute from the field
```
```
```
<pre class="calibre14">```
<?php
$validator->add('username', new UniquenessValidator(array(
'model' => 'Users',
'attribute' => 'nick'
)));
```
```
### Methods
public **validate** (*unknown* $validation, *unknown* $field)
Executes the validation
public **\_\_construct** (\[*unknown* $options\]) inherited from Phalcon\\Validation\\Validator
Phalcon\\Validation\\Validator constructor
public **isSetOption** (*unknown* $key) inherited from Phalcon\\Validation\\Validator
Checks if an option is defined
public **hasOption** (*unknown* $key) inherited from Phalcon\\Validation\\Validator
Checks if an option is defined
public **getOption** (*unknown* $key, \[*unknown* $defaultValue\]) inherited from Phalcon\\Validation\\Validator
Returns an option in the validator's options Returns null if the option hasn't set
public **setOption** (*unknown* $key, *unknown* $value) inherited from Phalcon\\Validation\\Validator
Sets an option in the validator
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- Class Phalcon\Validation\Validator\Alnum
- Class Phalcon\Validation\Validator\Alpha
- Class Phalcon\Validation\Validator\Between
- Class Phalcon\Validation\Validator\Confirmation
- Class Phalcon\Validation\Validator\Digit
- Class Phalcon\Validation\Validator\Email
- Class Phalcon\Validation\Validator\ExclusionIn
- Class Phalcon\Validation\Validator\File
- Class Phalcon\Validation\Validator\Identical
- Class Phalcon\Validation\Validator\InclusionIn
- Class Phalcon\Validation\Validator\Numericality
- Class Phalcon\Validation\Validator\PresenceOf
- Class Phalcon\Validation\Validator\Regex
- Class Phalcon\Validation\Validator\StringLength
- Class Phalcon\Validation\Validator\Uniqueness
- Class Phalcon\Validation\Validator\Url
- Interface Phalcon\Validation\ValidatorInterface
- Class Phalcon\Version
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