Changing Model::hasField() api to accept second parameter for checking existance of virtual field

Author: lorenzo

cake/libs/model/model.php

@@ -1009,12 +1009,13 @@ function getColumnType($column) {
  * 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($n)) {
@@ -1024,6 +1025,12 @@ function hasField($name) {
 			return false;
 		}
 
+		if ($checkVirtual && !empty($this->virtualFields)) {
+			if (array_key_exists($name,$this->virtualFields)) {
+				return true;
+			}
+		}
+
 		if (empty($this->_schema)) {
 			$this->schema();
 		}