Merge branch 'virtual-fields' into 1.3-misc

Conflicts:
	cake/tests/cases/libs/controller/controller.test.php

cake/libs/controller/controller.php

@@ -1102,9 +1102,11 @@ class Controller extends Object {
 			$value = $options['order'][$key];
 			unset($options['order'][$key]);
 
-			if (isset($object->{$alias}) && $object->{$alias}->hasField($field)) {
+			if ($object->hasField($field)) {
 				$options['order'][$alias . '.' . $field] = $value;
-			} elseif ($object->hasField($field)) {
+			} elseif ($object->hasField($field, true)) {
+				$options['order'][$field] = $value;
+			} elseif (isset($object->{$alias}) && $object->{$alias}->hasField($field)) {
 				$options['order'][$alias . '.' . $field] = $value;
 			}
 		}

cake/libs/model/datasources/dbo_source.php

@@ -363,6 +363,9 @@ class DboSource extends DataSource {
 		if ($this->hasResult()) {
 			$this->resultSet($this->_result);
 			$resultRow = $this->fetchResult();
+			if (!empty($resultRow)) {
+				$this->fetchVirtualField($resultRow);
+			}
 			return $resultRow;
 		} else {
 			return null;
@@ -393,6 +396,7 @@ class DboSource extends DataSource {
 				$out[] = $first;
 			}
 			while ($this->hasResult() && $item = $this->fetchResult()) {
+				$this->fetchVirtualField($item);
 				$out[] = $item;
 			}
 
@@ -410,6 +414,35 @@ class DboSource extends DataSource {
 		}
 	}
 
+/**
+ * Modifies $result array to place virtual fields in model entry where they belongs to
+ *
+ * @param array $resut REference to the fetched row
+ * @return void
+ */
+	function fetchVirtualField(&$result) {
+		if (isset($result[0]) && is_array($result[0])) {
+			foreach ($result[0] as $field => $value) {
+				if (strpos($field, '__') === false) {
+					continue;
+				}
+				list($alias, $virtual) = explode('__', $field);
+
+				if (!ClassRegistry::isKeySet($alias)) {
+					return;
+				}
+				$model = ClassRegistry::getObject($alias);
+				if ($model->isVirtualField($virtual)) {
+					$result[$alias][$virtual] = $value;
+					unset($result[0][$field]);
+				}
+			}
+			if (empty($result[0])) {
+				unset($result[0]);
+			}
+		}
+	}
+
 /**
  * Returns a single field of the first of query results for a given SQL query, or false if empty.
  *
@@ -420,7 +453,6 @@ class DboSource extends DataSource {
  */
 	function field($name, $sql) {
 		$data = $this->fetchRow($sql);
-
 		if (!isset($data[$name]) || empty($data[$name])) {
 			return false;
 		} else {
@@ -1363,7 +1395,7 @@ class DboSource extends DataSource {
  * @access public
  * @see DboSource::renderStatement()
  */
-	function buildStatement($query, $model) {
+	function buildStatement($query, &$model) {
 		$query = array_merge(array('offset' => null, 'joins' => array()), $query);
 		if (!empty($query['joins'])) {
 			$count = count($query['joins']);
@@ -1378,7 +1410,7 @@ class DboSource extends DataSource {
 			'fields' => implode(', ', $query['fields']),
 			'table' => $query['table'],
 			'alias' => $this->alias . $this->name($query['alias']),
-			'order' => $this->order($query['order']),
+			'order' => $this->order($query['order'], 'ASC', $model),
 			'limit' => $this->limit($query['limit'], $query['offset']),
 			'joins' => implode(' ', $query['joins']),
 			'group' => $this->group($query['group'])
@@ -1657,13 +1689,23 @@ class DboSource extends DataSource {
 				if (!isset($params[1])) {
 					$params[1] = 'count';
 				}
-				return 'COUNT(' . $this->name($params[0]) . ') AS ' . $this->name($params[1]);
+				if (is_object($model) && $model->isVirtualField($params[0])){
+					$arg = $this->__quoteFields($model->getVirtualField($params[0]));
+				} else {
+					$arg = $this->name($params[0]);
+				}
+				return 'COUNT(' . $arg . ') AS ' . $this->name($params[1]);
 			case 'max':
 			case 'min':
 				if (!isset($params[1])) {
 					$params[1] = $params[0];
 				}
-				return strtoupper($func) . '(' . $this->name($params[0]) . ') AS ' . $this->name($params[1]);
+				if (is_object($model) && $model->isVirtualField($params[0])) {
+					$arg = $this->__quoteFields($model->getVirtualField($params[0]));
+				} else {
+					$arg = $this->name($params[0]);
+				}
+				return strtoupper($func) . '(' . $arg . ') AS ' . $this->name($params[1]);
 			break;
 		}
 	}
@@ -1790,6 +1832,24 @@ class DboSource extends DataSource {
 		return $data;
 	}
 
+/**
+ * Converts model virtual fields into sql expressions to be fetched later
+ *
+ * @param Model $model
+ * @param string $alias Alias tablename
+ * @param mixed $fields virtual fields to be used on query
+ * @return array
+ */
+	function _constructVirtualFields(&$model,$alias,$fields) {
+		$virtual = array();
+		foreach ($fields as $field) {
+			$virtualField = $this->name("{$alias}__{$field}");
+			$expression = $this->__quoteFields($model->getVirtualField($field));
+			$virtual[] = '(' .$expression . ") {$this->alias} {$virtualField}";
+		}
+		return $virtual;
+	}
+
 /**
  * Generates the fields list of an SQL query.
  *
@@ -1804,7 +1864,8 @@ class DboSource extends DataSource {
 		if (empty($alias)) {
 			$alias = $model->alias;
 		}
-		if (empty($fields)) {
+		$allFields = empty($fields);
+		if ($allFields) {
 			$fields = array_keys($model->schema());
 		} elseif (!is_array($fields)) {
 			$fields = String::tokenize($fields);
@@ -1814,10 +1875,19 @@ class DboSource extends DataSource {
 		if (!$quote) {
 			return $fields;
 		}
+		$virtual = array();
+		if ($model->getVirtualField()) {
+			$keys =  array_keys($model->getVirtualField());
+			$virtual = ($allFields) ? $keys :  array_intersect($keys, $fields);
+		}
 		$count = count($fields);
 
 		if ($count >= 1 && !in_array($fields[0], array('*', 'COUNT(*)'))) {
 			for ($i = 0; $i < $count; $i++) {
+				if (in_array($fields[$i], $virtual)) {
+					unset($fields[$i]);
+					continue;
+				}
 				if (preg_match('/^\(.*\)\s' . $this->alias . '.*/i', $fields[$i])){
 					continue;
 				} elseif (!preg_match('/^.+\\(.*\\)/', $fields[$i])) {
@@ -1871,6 +1941,9 @@ class DboSource extends DataSource {
 				}
 			}
 		}
+		if (!empty($virtual)) {
+			$fields = array_merge($fields,$this->_constructVirtualFields($model, $alias, $virtual));
+		}
 		return array_unique($fields);
 	}
 
@@ -2053,6 +2126,11 @@ class DboSource extends DataSource {
 			}
 		}
 
+		$virtual = false;
+		if (is_object($model) && $model->isVirtualField($key)) {
+			$key = $this->__quoteFields($model->getVirtualField($key));
+			$virtual = true;
+		}
 
 		$type = (is_object($model) ? $model->getColumnType($key) : null);
 
@@ -2067,7 +2145,7 @@ class DboSource extends DataSource {
 
 		$value = $this->value($value, $type);
 
-		if ($key !== '?') {
+		if (!$virtual && $key !== '?') {
 			$isKey = (strpos($key, '(') !== false || strpos($key, ')') !== false);
 			$key = $isKey ? $this->__quoteFields($key) : $this->name($key);
 		}
@@ -2105,7 +2183,9 @@ class DboSource extends DataSource {
 				break;
 			}
 		}
-
+		if ($virtual) {
+			return "({$key}) {$operator} {$value}";
+		}
 		return "{$key} {$operator} {$value}";
 	}
 
@@ -2172,69 +2252,71 @@ class DboSource extends DataSource {
  *
  * @param string $key Field reference, as a key (i.e. Post.title)
  * @param string $direction Direction (ASC or DESC)
+ * @param object $model model reference (used to look for virtual field)
  * @return string ORDER BY clause
  * @access public
  */
-	function order($keys, $direction = 'ASC') {
+	function order($keys, $direction = 'ASC', &$model = null) {
-		if (is_string($keys) && strpos($keys, ',') && !preg_match('/\(.+\,.+\)/', $keys)) {
+		if (!is_array($keys)) {
-			$keys = array_map('trim', explode(',', $keys));
+			$keys = array($keys);
 		}
-
-		if (is_array($keys)) {
 		$keys = array_filter($keys);
-		}
+		$result = array();
+		while (!empty($keys)) {
+			list($key, $dir) = each($keys);
+			array_shift($keys);
 
-		if (empty($keys) || (is_array($keys) && isset($keys[0]) && empty($keys[0]))) {
-			return '';
-		}
-
-		if (is_array($keys)) {
-			$keys = (Set::countDim($keys) > 1) ? array_map(array(&$this, 'order'), $keys) : $keys;
-
-			foreach ($keys as $key => $value) {
 			if (is_numeric($key)) {
-					$key = $value = ltrim(str_replace('ORDER BY ', '', $this->order($value)));
+				$key = $dir;
-					$value = (!preg_match('/\\x20ASC|\\x20DESC/i', $key) ? ' ' . $direction : '');
+				$dir = $direction;
-				} else {
-					$value = ' ' . $value;
 			}
 
-				if (!preg_match('/^.+\\(.*\\)/', $key) && !strpos($key, ',')) {
+			if (is_string($key) && strpos($key, ',') && !preg_match('/\(.+\,.+\)/', $key)) {
-					if (preg_match('/\\x20ASC|\\x20DESC/i', $key, $dir)) {
+				$key = array_map('trim', explode(',', $key));
-						$dir = $dir[0];
-						$key = preg_replace('/\\x20ASC|\\x20DESC/i', '', $key);
-					} else {
-						$dir = '';
 			}
+			if (is_array($key)) {
+				//Flatten the array
+				$key = array_reverse($key, true);
+				foreach ($key as $k => $v) {
+					if (is_numeric($k)) {
+						array_unshift($keys, $v);
+					} else {
+						$keys = array($k => $v) + $keys;
+					}
+				}
+				continue;
+			}
+
+			if (preg_match('/\\x20ASC|\\x20DESC/i', $key, $_dir)) {
+				$dir = $_dir[0];
+				$key = preg_replace('/\\x20ASC|\\x20DESC/i', '', $key);
+			}
+
+			if (strpos($key, '.')) {
+				preg_match_all('/([a-zA-Z0-9_]{1,})\\.([a-zA-Z0-9_]{1,})/', $key, $matches, PREG_PATTERN_ORDER);
+				$pregCount = count($matches[0]);
+				for ($i = 0; $i < $pregCount; $i++) {
+					if (!is_numeric($matches[0][$i])) {
+						$key = preg_replace('/' . $matches[0][$i] . '/', $this->name($matches[0][$i]), $key);
+					}
+				}
+			}
+
 			$key = trim($key);
-					if (!preg_match('/\s/', $key)) {
+			if (!preg_match('/\s/', $key) && !strpos($key,'.')) {
+				if (is_object($model) && $model->isVirtualField($key)) {
+					$key =  '('.$this->__quoteFields($model->getVirtualField($key)).')';
+				} else {
 					$key = $this->name($key);
 				}
+			}
 			$key .= ' ' . trim($dir);
+			$result[] = $key;
 		}
-				$order[] = $this->order($key . $value);
+		if (!empty($result)) {
+			return ' ORDER BY ' . implode(', ', $result);
 		}
-			return ' ORDER BY ' . trim(str_replace('ORDER BY', '', implode(',', $order)));
+		return '';
-		}
-		$keys = preg_replace('/ORDER\\x20BY/i', '', $keys);
-
-		if (strpos($keys, '.')) {
-			preg_match_all('/([a-zA-Z0-9_]{1,})\\.([a-zA-Z0-9_]{1,})/', $keys, $result, PREG_PATTERN_ORDER);
-			$pregCount = count($result[0]);
-
-			for ($i = 0; $i < $pregCount; $i++) {
-				if (!is_numeric($result[0][$i])) {
-					$keys = preg_replace('/' . $result[0][$i] . '/', $this->name($result[0][$i]), $keys);
-				}
-			}
-			$result = ' ORDER BY ' . $keys;
-			return $result . (!preg_match('/\\x20ASC|\\x20DESC/i', $keys) ? ' ' . $direction : '');
-
-		} elseif (preg_match('/(\\x20ASC|\\x20DESC)/i', $keys, $match)) {
-			$direction = $match[1];
-			return ' ORDER BY ' . preg_replace('/' . $match[1] . '/', '', $keys) . $direction;
-		}
-		return ' ORDER BY ' . $keys . ' ' . $direction;
 	}
 
 /**

cake/libs/model/model.php

@@ -1009,21 +1009,28 @@ class Model extends Overloadable {
  * Returns true if the supplied field exists in the model's database table.
  *
  * @param mixed $name Name of field to look for, or an array of names
+ * @param boolean $checkVirtual checks if the field is declared as virtual
  * @return mixed If $name is a string, returns a boolean indicating whether the field exists.
  *               If $name is an array of field names, returns the first field that exists,
  *               or false if none exist.
  * @access public
  */
-	function hasField($name) {
+	function hasField($name, $checkVirtual = false) {
 		if (is_array($name)) {
 			foreach ($name as $n) {
-				if ($this->hasField($n)) {
+				if ($this->hasField($n, $checkVirtual)) {
 					return $n;
 				}
 			}
 			return false;
 		}
 
+		if ($checkVirtual && !empty($this->virtualFields)) {
+			if ($this->isVirtualField($name)) {
+				return true;
+			}
+		}
+
 		if (empty($this->_schema)) {
 			$this->schema();
 		}
@@ -1034,6 +1041,36 @@ class Model extends Overloadable {
 		return false;
 	}
 
+/**
+ * Returns true if the supplied field is a model Virtual Field
+ *
+ * @param mixed $name Name of field to look for
+ * @return boolean indicating whether the field exists as a model virtual field.
+ * @access public
+ */
+	function isVirtualField($field) {
+		return !empty($this->virtualFields) && is_string($field) && array_key_exists($field, $this->virtualFields);
+	}
+
+/**
+ * Returns the expression for a model virtual field 
+ *
+ * @param mixed $name Name of field to look for
+ * @return mixed If $field is string expression bound to virtual field $field
+ *					  If $field is null, returns an array of all model virtual fields
+ *               or false if none $field exist.
+ * @access public
+ */
+	function getVirtualField($field = null) {
+		if ($field == null) {
+			return empty($this->virtualFields) ? false : $this->virtualFields;
+		}
+		if ($this->isVirtualField($field)) {
+			return $this->virtualFields[$field];
+		}
+		return false;
+	}
+
 /**
  * Initializes the model for writing a new record, loading the default values
  * for those fields that are not defined in $data, and clearing previous validation errors.
@@ -1121,7 +1158,8 @@ class Model extends Overloadable {
 		} else {
 			$recursive = $this->recursive;
 		}
-		if ($data = $this->find($conditions, $name, $order, $recursive)) {
+		$fields = $name;
+		if ($data = $this->find('first', compact('conditions', 'fields', 'order', 'recursive'))) {
 			if (strpos($name, '.') === false) {
 				if (isset($data[$this->alias][$name])) {
 					return $data[$this->alias][$name];
@@ -1132,9 +1170,8 @@ class Model extends Overloadable {
 					return $data[$name[0]][$name[1]];
 				}
 			}
-			if (!empty($data[0])) {
+			if (isset($data[0]) && count($data[0]) > 0) {
-				$name = key($data[0]);
+				return array_shift($data[0]);
-				return $data[0][$name];
 			}
 		} else {
 			return false;

cake/tests/cases/libs/controller/controller.test.php

@@ -1281,5 +1281,26 @@ class ControllerTest extends CakeTestCase {
 		$expected = array(404 => 'Sorry Bro');
 		$this->assertEqual($result, $expected);
 	}
+
+	function testPaginateOrderVirtualField() {
+		$Controller =& new Controller();
+		$Controller->uses = array('ControllerPost', 'ControllerComment');
+		$Controller->params['url'] = array();
+		$Controller->constructClasses();
+		$Controller->ControllerPost->virtualFields = array(
+			'offset_test' => 'ControllerPost.id + 1'
+		);
+
+		$Controller->paginate = array(
+			'fields' => array('id', 'title', 'offset_test'),
+			'order' => array('offset_test' => 'DESC')
+		);
+		$result = $Controller->paginate('ControllerPost');
+		$this->assertEqual(Set::extract($result, '{n}.ControllerPost.offset_test'), array(4, 3, 2));
+
+		$Controller->passedArgs = array('sort' => 'offset_test', 'direction' => 'asc');
+		$result = $Controller->paginate('ControllerPost');
+		$this->assertEqual(Set::extract($result, '{n}.ControllerPost.offset_test'), array(2, 3, 4));
+	}
 }
 ?>

cake/tests/cases/libs/model/datasources/dbo_source.test.php

@@ -4081,5 +4081,147 @@ class DboSourceTest extends CakeTestCase {
 		$this->assertNoPattern('/Num:/s', $contents);
 		$this->assertNoPattern('/Took:/s', $contents);
 	}
+
+/**
+ * test fields generating usable virtual fields to use in query
+ *
+ * @return void
+ */
+	function testVirtualFields() {
+		$this->loadFixtures('Article');
+
+		$Article =& ClassRegistry::init('Article');
+		$Article->virtualFields = array(
+			'this_moment' => 'NOW()',
+			'two' => '1 + 1',
+			'comment_count' => 'SELECT COUNT(*) FROM ' . $this->db->fullTableName('comments') .
+				' WHERE Article.id = ' . $this->db->fullTableName('comments') . '.article_id'
+		);
+		$result = $this->db->fields($Article);
+		$expected = array(
+			'`Article`.`id`',
+			'`Article`.`user_id`',
+			'`Article`.`title`',
+			'`Article`.`body`',
+			'`Article`.`published`',
+			'`Article`.`created`',
+			'`Article`.`updated`',
+			'(NOW()) AS  `Article__this_moment`',
+			'(1 + 1) AS  `Article__two`',
+			'(SELECT COUNT(*) FROM comments WHERE `Article`.`id` = `comments`.`article_id`) AS  `Article__comment_count`'
+		);
+		$this->assertEqual($expected,$result);
+
+		$result = $this->db->fields($Article, null, array('this_moment','title'));
+		$expected = array(
+			'`Article`.`title`',
+			'(NOW()) AS  `Article__this_moment`',
+		);
+		$this->assertEqual($expected,$result);
+	}
+
+/**
+ * test conditions to generate query conditions for virtual fields
+ *
+ * @return void
+ */
+	function testVirtualFieldsInConditions() {
+		$this->loadFixtures('Article');
+
+		$Article =& ClassRegistry::init('Article');
+		$Article->virtualFields = array(
+			'this_moment' => 'NOW()',
+			'two' => '1 + 1',
+			'comment_count' => 'SELECT COUNT(*) FROM ' . $this->db->fullTableName('comments') .
+				' WHERE Article.id = ' . $this->db->fullTableName('comments') . '.article_id'
+		);
+		$conditions = array('two' => 2);
+		$result = $this->db->conditions($conditions,true,false,$Article);
+		$expected = '(1 + 1) = 2';
+		$this->assertEqual($expected, $result);
+
+		$conditions = array('this_moment BETWEEN ? AND ?' => array(1,2));
+		$expected = 'NOW() BETWEEN 1 AND 2';
+		$result = $this->db->conditions($conditions, true, false, $Article);
+		$this->assertEqual($expected, $result);
+
+		$conditions = array('comment_count >' => 5);
+		$expected = '(SELECT COUNT(*) FROM comments WHERE `Article`.`id` = `comments`.`article_id`) > 5';
+		$result = $this->db->conditions($conditions, true, false, $Article);
+		$this->assertEqual($expected, $result);
+
+		$conditions = array('NOT' => array('two' => 2));
+		$result = $this->db->conditions($conditions, true, false, $Article);
+		$expected = 'NOT ((1 + 1) = 2)';
+		$this->assertEqual($expected, $result);
+	}
+
+/**
+ * test order to generate query order clause for virtual fields
+ *
+ * @return void
+ */
+	function testVirtualFieldsInOrder() {
+		$this->loadFixtures('Article');
+
+		$Article =& ClassRegistry::init('Article');
+		$Article->virtualFields = array(
+			'this_moment' => 'NOW()',
+			'two' => '1 + 1',
+		);
+		$order = array('two', 'this_moment');
+		$result = $this->db->order($order, 'ASC', $Article);
+		$expected = ' ORDER BY (1 + 1) ASC, (NOW()) ASC';
+		$this->assertEqual($expected, $result);
+	}
+
+/**
+ * test calculate to generate claculate statements on virtual fields
+ *
+ * @return void
+ */
+	function testVirtualFieldsInCalculate() {
+		$this->loadFixtures('Article');
+
+		$Article =& ClassRegistry::init('Article');
+		$Article->virtualFields = array(
+			'this_moment' => 'NOW()',
+			'two' => '1 + 1',
+			'comment_count' => 'SELECT COUNT(*) FROM ' . $this->db->fullTableName('comments') .
+				' WHERE Article.id = ' . $this->db->fullTableName('comments'). '.article_id'
+		);
+
+		$result = $this->db->calculate($Article, 'count', array('this_moment'));
+		$expected = 'COUNT(NOW()) AS `count`';
+		$this->assertEqual($expected, $result);
+
+		$result = $this->db->calculate($Article, 'max', array('comment_count'));
+		$expected = 'MAX(SELECT COUNT(*) FROM comments WHERE `Article`.`id` = `comments`.`article_id`) AS `comment_count`';
+		$this->assertEqual($expected, $result);
+	}
+
+/**
+ * test a full example of using virtual fields
+ *
+ * @return void
+ */
+	function testVirtualFieldsFetch() {
+		$this->loadFixtures('Article', 'Comment');
+
+		$Article =& ClassRegistry::init('Article');
+		$Article->virtualFields = array(
+			'comment_count' => 'SELECT COUNT(*) FROM ' . $this->db->fullTableName('comments') .
+				' WHERE Article.id = ' . $this->db->fullTableName('comments') . '.article_id'
+		);
+
+		$conditions = array('comment_count >' => 2);
+		$query = 'SELECT ' . join(',',$this->db->fields($Article, null, array('id', 'comment_count'))) .
+				' FROM ' .  $this->db->fullTableName($Article) . ' Article ' . $this->db->conditions($conditions, true, true, $Article);
+		$result = $this->db->fetchAll($query);
+		$expected = array(array(
+			'Article' => array('id' => 1, 'comment_count' => 4)
+		));
+		$this->assertEqual($expected, $result);
+	}
 }
 ?>

cake/tests/cases/libs/model/model_read.test.php

@@ -7161,5 +7161,85 @@ class ModelReadTest extends BaseModelTest {
 		$comments = $Comment->find('first');
 		$this->assertEqual($comments['Comment']['querytype'], 'first');
 	}
+
+/**
+ * testVirtualFields()
+ *
+ * Test correct fetching of virtual fields
+ * currently is not possible to do Relation.virtualField
+ *
+ * @access public
+ * @return void
+ */
+		function testVirtualFields() {
+			$this->loadFixtures('Post','Author');
+			$Post = ClassRegistry::init('Post');
+			$Post->virtualFields = array('two' => "1 + 1");
+			$result = $Post->find('first');
+			$this->assertEqual($result['Post']['two'], 2);
+
+			$Post->Author->virtualFields = array('false' => '1 = 2');
+			$result = $Post->find('first');
+			$this->assertEqual($result['Post']['two'], 2);
+			$this->assertEqual($result['Author']['false'],false);
+
+			$result = $Post->find('first',array('fields' => array('author_id')));
+			$this->assertFalse(isset($result['Post']['two']));
+			$this->assertFalse(isset($result['Author']['false']));
+
+			$result = $Post->find('first',array('fields' => array('author_id', 'two')));
+			$this->assertEqual($result['Post']['two'], 2);
+			$this->assertFalse(isset($result['Author']['false']));
+
+			$result = $Post->find('first',array('fields' => array('two')));
+			$this->assertEqual($result['Post']['two'], 2);
+
+			$Post->id = 1;
+			$result = $Post->field('two');
+			$this->assertEqual($result, 2);
+
+			$result = $Post->find('first',array(
+				'conditions' => array('two' => 2),
+				'limit' => 1
+			));
+			$this->assertEqual($result['Post']['two'], 2);
+
+			$result = $Post->find('first',array(
+				'conditions' => array('two <' => 3),
+				'limit' => 1
+			));
+			$this->assertEqual($result['Post']['two'], 2);
+
+			$result = $Post->find('first',array(
+				'conditions' => array('NOT' => array('two >' => 3)),
+				'limit' => 1
+			));
+			$this->assertEqual($result['Post']['two'], 2);
+
+			$dbo =& $Post->getDataSource();
+			$Post->virtualFields = array('other_field' => 'Post.id + 1');
+			$result = $Post->find('first',array(
+				'conditions' => array('other_field' => 3),
+				'limit' => 1
+			));
+			$this->assertEqual($result['Post']['id'], 2);
+
+			$Post->virtualFields = array('other_field' => 'Post.id + 1');
+			$result = $Post->find('all',array(
+				'fields' => array($dbo->calculate($Post, 'max',array('other_field')))
+			));
+			$this->assertEqual($result[0][0]['other_field'], 4);
+
+			ClassRegistry::flush();
+			$Writing = ClassRegistry::init(array('class' => 'Post', 'alias' => 'Writing'), 'Model');
+			$Writing->virtualFields = array('two' => "1 + 1");
+			$result = $Writing->find('first');
+			$this->assertEqual($result['Writing']['two'], 2);
+			
+			$Post->create();
+			$Post->virtualFields = array('other_field' => 'COUNT(Post.id) + 1');
+			$result = $Post->field('other_field');
+			$this->assertEqual($result, 4);
+		}
 }
 ?>