UniqueTextField SilverStripe

UniqueTextField

<?php

class UniqueTextField extends TextField {

	public function Type() {
		return 'unique text';
	}
	protected $restrictedTable;

	protected $restrictedField;

	public function __construct($name, $title, $restrictedTable, $restrictedField, $value = "") {
		$this->restrictedTable = $restrictedTable;
		$this->restrictedField = $restrictedField;
		parent::__construct($name, $title, $value);
	}

	function validate($validator) {
		$this->value = trim($this->value);
		$ClassName = $this->restrictedTable;

		$exists = $ClassName::get()->filter($this->restrictedField, $this->value)->count();

		if($exists > 1) {
			$validator->validationError(
				$this->name,
				_t('UniqueTextField.UNIQUEVALIDATION', "Es existiert bereits ein Element mit dem selben Text"),
				"validation"
			);
			return false;
		} else {
			return true;
		}
	}
}