preferable example for getting data method for model(behaviorized)

categorize.php

<?php

/**
 * Available find keys:
 * 'category': adding creteria with name of category.
 */
class CategorizeBehavior extends ModelBehavior {

	public $defaultSettings = array(
		'key' => 'category',
		'categoryModel' => 'Category',
		'field' => 'name',
	);

	public function setup($Model, $config = array()) {
		$this->settings[$Model->alias] = Set::merge($this->defaultSettings, $config);
	}

	public function beforeFind($Model, $query = array()) {
		if (array_key_exists($this->settings[$Model->alias]['key'], $query)) {
			$query = Set::merge($query, array(
				'conditions' => array(
					$this->settings[$Model->alias]['categoryModel'] . '.' . $this->settings[$Model->alias]['field'] => $query[$this->settings[$Model->alias]['key']],
				),
			));
			unset($query[$this->settings[$Model->alias]['key']]);
		}

		return $query;
	}

}

find_next.php

<?php

/**
 * Usage:
 * $nextPost = $this->Post->find('next', array(
 * 	'id' => 1,
 * 	...
 * ));
 */
class FindNextBehavior extends ModelBehavior {

	public $defaultSettings = array(
		'findType' => 'next',
	);

	public function setup($Model, $config = array()) {
		$this->settings[$Model->alias] = Set::merge($this->defaultSettings, $config);
		$this->mapMethods = array(
			sprintf('/^_find%s$/', ucfirst($this->settings[$Model->alias]['findType'])) => '__findNext',
		);
		$Model->_findMethods[$this->settings[$Model->alias]['findType']] = true;
	}

	public function __findNext($Model, $method, $state, $query, $results = array()) {
		if ($state == 'before') {
			if (!array_key_exists('value', $query)) {
				throw new Exception(__d('findNext', 'query must contain value for findNext: ', true) . var_export($query, true));
			}
			$field = isset($query['field']) ? $field : $Model->alias . '.' . $Model->primaryKey;
			unset($query['field']);

			$greaterQuery = Set::merge($query, array(
				'conditions' => array(
					"$field >" => $query['value'],
				),
			));
			$greaterExists = $Model->find('count', $greaterQuery);
			if (!$greaterExists) {
				$littlerQuery = Set::merge($query, array(
					'conditions' => array(
						"$field <" => $query['value'],
					),
				));
				$query = $littlerQuery;
			} else {
				$query = $greaterQuery;
			}
			unset($query['value']);

			$query['order'] = array(
				$field => 'ASC',
			);

			return $Model->_findFirst($state, $query, $results);
		} elseif ($state == 'after') {
			return $Model->_findFirst($state, $query, $results);
		}
	}

}

taggable.php

<?php

/**
 * Available find keys:
 * 'tag': adding creteria and additional association with name of tag.
 */
class TaggableBehavior extends ModelBehavior {

	public $defaultSettings = array(
		'key' => 'tag',
		'joinModel' => null,
		'tagModel' => 'Tag',
		'field' => 'name',
		'group' => 'id',
	);

	public function setup($Model, $config = array()) {
		$this->settings[$Model->alias] = Set::merge($this->defaultSettings, $config);
	}

	public function beforeFind($Model, $query = array()) {
		$settings = $this->settings[$Model->alias];

		if (array_key_exists($settings['key'], $query)) {
			if (!$settings['joinModel']) {
				$settings['joinModel'] = Inflector::pluralize($Model->alias) . $settings['tagModel'];
			}

			$query = Set::merge($query, array(
				'conditions' => array(
					$settings['tagModel'] . '.' . $settings['field'] => $query[$settings['key']],
				),
				'joins' => array(
					array(
						'alias' => $settings['joinModel'],
						'table' => Inflector::tableize($settings['joinModel']),
						'conditions' => sprintf(
							'`%s`.`%s` = `%s`.`id`',
							$settings['joinModel'],
							Inflector::underscore($Model->alias) . '_id',
							$Model->alias
						),
						'type' => 'RIGHT',
					),
					array(
						'alias' => $settings['tagModel'],
						'table' => Inflector::tableize($settings['tagModel']),
						'conditions' => sprintf(
							'`%s`.`%s` = `%s`.`id`',
							$settings['joinModel'],
							Inflector::underscore($settings['tagModel']) . '_id',
							$settings['tagModel']
						),
						'type' => 'RIGHT',
					),
				),
				'group' => $Model->escapeField($settings['group']),
			));
			unset($query[$settings['key']]);
		}

		return $query;
	}

}