Simplify constructor logic.

Chaining through multiple objects makes mocking and testing harder.
Moving method calls out of the constructor makes the ResultSet simpler to
work with. This will be more important as serialize features are
implemented.

lib/Cake/ORM/ResultSet.php

@@ -70,13 +70,6 @@ class ResultSet implements Iterator {
  */
 	protected $_defaultTable;
 
-/**
- * Default table alias
- *
- * @var string
- */
-	protected $_defaultAlias;
-
 /**
  * List of associations that should be eager loaded
  *
@@ -103,7 +96,6 @@ public function __construct($query, $statement) {
 		$this->_query = $query;
 		$this->_statement = $statement;
 		$this->_defaultTable = $this->_query->repository();
-		$this->_defaultAlias = $this->_defaultTable->alias();
 		$this->_calculateAssociationMap();
 	}
 
@@ -207,9 +199,10 @@ protected function _fetchResult() {
  * @return array
  */
 	protected function _groupResult() {
+		$defaultAlias = $this->_defaultTable->alias();
 		$results = [];
 		foreach ($this->_current as $key => $value) {
-			$table = $this->_defaultAlias;
+			$table = $defaultAlias;
 			$field = $key;
 
 			if (empty($this->_map[$key])) {
@@ -226,9 +219,9 @@ protected function _groupResult() {
 			$results[$table][$field] = $value;
 		}
 
-		$results[$this->_defaultAlias] = $this->_castValues(
+		$results[$defaultAlias] = $this->_castValues(
 			$this->_defaultTable,
-			$results[$this->_defaultAlias]
+			$results[$defaultAlias]
 		);
 
 		foreach (array_reverse($this->_associationMap) as $alias => $assoc) {
@@ -239,7 +232,7 @@ protected function _groupResult() {
 			$results = $assoc->transformRow($results);
 		}
 
-		return $results[$this->_defaultAlias];
+		return $results[$defaultAlias];
 	}
 
 /**
@@ -269,4 +262,5 @@ protected function _castValues($table, $values) {
 
 		return $values;
 	}
+
 }