Only bake HABTM associations for tables that exist.

bake often guesses wrong when it comes to habtm. Only add associations
we're highly confident of. This includes tables where the foreign table
also exists.

Refs #3532

lib/Cake/Console/Command/Task/ModelTask.php

@@ -621,24 +621,20 @@ public function findHasOneAndMany(Model $model, $associations) {
 	public function findHasAndBelongsToMany(Model $model, $associations) {
 		$foreignKey = $this->_modelKey($model->name);
 		foreach ($this->_tables as $otherTable) {
+			$tableName = null;
 			$tempOtherModel = $this->_getModelObject($this->_modelName($otherTable), $otherTable);
 			$modelFieldsTemp = $tempOtherModel->schema(true);
 
 			$offset = strpos($otherTable, $model->table . '_');
 			$otherOffset = strpos($otherTable, '_' . $model->table);
 
 			if ($offset === 0) {
-				$offset = strlen($model->table . '_');
-				$habtmName = $this->_modelName(substr($otherTable, $offset));
-				$associations['hasAndBelongsToMany'][] = array(
-					'alias' => $habtmName,
-					'className' => $habtmName,
-					'foreignKey' => $foreignKey,
-					'associationForeignKey' => $this->_modelKey($habtmName),
-					'joinTable' => $otherTable
-				);
+				$tableName = substr($otherTable, strlen($model->table . '_'));
 			} elseif ($otherOffset === 0) {
-				$habtmName = $this->_modelName(substr($otherTable, 0, $otherOffset));
+				$tableName = substr($otherTable, 0, $otherOffset);
+			}
+			if ($tableName && in_array($tableName, $this->_tables)) {
+				$habtmName = $this->_modelName($tableName);
 				$associations['hasAndBelongsToMany'][] = array(
 					'alias' => $habtmName,
 					'className' => $habtmName,