void __construct(string $table, string $column = 'NULL') Create a new exists

$this minHeight(int $value) Set the "min height" constraint.

$this whereNot(string $column, string $value) Set a "where not" constraint

string __toString() Convert the rule to a validation string.

void __construct(string $table, string $column = 'NULL') Create a new unique

$this whereNotNull(string $column) Set a "where not null" constraint on

void __construct(array $constraints = array()) Create a new dimensions

$this ignore(mixed $id, string $idColumn = 'id') Ignore the given ID during

array queryCallbacks() Get the custom query callbacks for the rule.

string __toString() Convert the rule to a validation string.