allow to use non-primary columns in crossref tables

Author: kasparsj

src/Propel/Generator/Model/CrossForeignKeys.php

@@ -130,9 +130,9 @@ public function getIncomingForeignKey()
      * @param  ForeignKey $fk
      * @return bool
      */
-    public function isAtLeastOneLocalPrimaryKeyNotCovered(ForeignKey $fk)
+    public function isAtLeastOneLocalColumnNotCovered(ForeignKey $fk)
     {
-        $primaryKeys = $fk->getLocalPrimaryKeys();
+        $primaryKeys = $fk->getLocalColumnObjects();
         foreach ($primaryKeys as $primaryKey) {
             $covered = false;
             foreach ($this->getCrossForeignKeys() as $crossFK) {

src/Propel/Generator/Model/ForeignKey.php

@@ -765,9 +765,9 @@ public function isAtLeastOneLocalColumnRequired()
      *
      * @return boolean
      */
-    public function isAtLeastOneLocalPrimaryKeyIsRequired()
+    public function isAtLeastOneLocalColumnIsRequired()
     {
-        foreach ($this->getLocalPrimaryKeys() as $pk) {
+        foreach ($this->getLocalColumnObjects() as $pk) {
             if ($pk->isNotNull() && !$pk->hasDefaultValue()) {
                 return true;
             }

src/Propel/Generator/Model/Table.php

@@ -821,8 +821,8 @@ public function getCrossFks()
             if ($refFK->getTable()->isCrossRef()) {
                 $crossFK = new CrossForeignKeys($refFK, $this);
                 foreach ($refFK->getOtherFks() as $fk) {
-                    if ($fk->isAtLeastOneLocalPrimaryKeyIsRequired() &&
-                        $crossFK->isAtLeastOneLocalPrimaryKeyNotCovered($fk)) {
+                    if ($fk->isAtLeastOneLocalColumnIsRequired() &&
+                        $crossFK->isAtLeastOneLocalColumnNotCovered($fk)) {
                         $crossFK->addCrossForeignKey($fk);
                     }
                 }