public function removeConstraint($fieldName, $constraintName)
    {
        if ($constraint = $this->getConstraint($fieldName, $constraintName)) {
            if ($this->form) {
                $constraint->removeParsley();
            }
            $class = get_class($constraint);
            unset($this->constraints[$fieldName][$class]);
            unset($constraint);
        }

        return $this;
    }