enabled creating interest preorders without any wohneinheit

application/PreorderIFrame/PreorderIFrameModel.php

@@ -118,17 +118,34 @@ class PreorderIFrameModel extends mfBaseModel
         $results = $this->db->fetch_all_assoc($this->db->query($query));
         if (empty($results)) return [];
 
+        $orderType = $params['orderType'] ?? 'order';
+
+        // For 'interest' order type, return a single entry for the whole building.
+        if ($orderType === 'interest') {
+            $representativeAddress = $this->formatAddressRow($results[0]);
+            $representativeAddress['wohneinheit_id'] = null; // Critical: No specific unit
+            $representativeAddress['oaid'] = $results[0]['oaid']; // Use building OAID
+            $representativeAddress['showText'] = "Gesamtes Gebäude";
+            $representativeAddress['preorderTypes'] = ['interest'];
+            return [$representativeAddress]; // Return one item, so frontend proceeds directly.
+        }
+
+        // Original logic for 'order' type
         $addresses = [];
         $topCounter = 1;
 
         if (count($results) > 1 && $results[0]['wohneinheit_id'] !== null) {
             foreach ($results as $row) {
-                $addresses[] = array_merge($this->formatAddressRow($row), [
-                    'showText' => $this->buildShowText($row, $topCounter++)
-                ]);
+                $address = $this->formatAddressRow($row);
+                $address['showText'] = $this->buildShowText($row, $topCounter++);
+                $address['preorderTypes'] = ['order'];
+                $addresses[] = $address;
             }
         } else {
-            $addresses[] = $this->formatAddressRow($results[0]);
+            // Single unit or building without units
+            $address = $this->formatAddressRow($results[0]);
+            $address['preorderTypes'] = ['order'];
+            $addresses[] = $address;
         }
 
         return $addresses;
@@ -139,7 +156,7 @@ class PreorderIFrameModel extends mfBaseModel
         return [
             'oaid' => $row['unit_oaid'] ?? $row['oaid'],
             'street' => $row['street'],
-            'housenumber' => $row['hausnummer'],
+            'housenumber' => $row['housenumber'],
             'hausnummer_id' => $row['hausnummer_id'],
             'wohneinheit_id' => $row['wohneinheit_id'],
             'building_type' => intval($row['building_type']),
@@ -151,7 +168,6 @@ class PreorderIFrameModel extends mfBaseModel
             'zusatz' => $row['zusatz'],
             'building_unit_count' => $row['building_unit_count'],
             'showText' => $this->buildShowText($row, 1),
-            'preorderTypes' => ['order', 'interest'] // Can be used for both
         ];
     }