Fix bug #428, clearing object relations before adding new ones in a query

lib/Doctrine/Hydrate/Record.php

@@ -101,7 +101,11 @@ class Doctrine_Hydrate_Record extends Doctrine_Object
         }
         $this->_tables[$component]->setData($data);
         $record = $this->_tables[$component]->getRecord();
-        $this->_records[] = $record;
+
+        if ( ! isset($this->_records[$record->getOid()]) ) {
+            $record->clearRelated();
+            $this->_records[$record->getOid()] = $record;
+        }
 
         return $record;
     }

lib/Doctrine/Record.php

@@ -681,6 +681,17 @@ abstract class Doctrine_Record extends Doctrine_Record_Abstract implements Count
             $this->_references[$name] = $rel->fetchRelatedFor($this);
         }
     }
+
+    /**
+     * clearRelated
+     * unsets all the relationships this object has
+     *
+     * (references to related objects still remain on Table objects)
+     */
+    public function clearRelated()
+    {
+        $this->_references = array();
+    }
     
     /**
      * getTable