Show 'part of' in candidate list

frontend/App.vue

@@ -146,6 +146,11 @@
                 <span v-if="osm.address_list.length">
                     <br>address nodes: {{ osm.address_list.join("; ") }}
                 </span>
+
+                <span v-if="osm.part_of">
+                    <br>part of: {{ osm.part_of.join("; ") }}
+                </span>
+
                 </td>
               </tr>
             </tbody>

web_view.py

@@ -951,6 +951,21 @@ def get_address_nodes_within_building(building, bbox):
 
     return [node.tags for node in q]
 
+def get_part_of(thing, bbox):
+    db_bbox = make_envelope(bbox)
+    ewkt = thing.as_EWKT
+    q = model.Polygon.query.filter(
+        func.ST_Intersects(db_bbox, model.Polygon.way),
+        func.ST_Covers(model.Polygon.way, func.ST_GeomFromEWKT(ewkt)),
+        or_(
+            model.Polygon.tags.has_key("landuse"),
+            model.Polygon.tags.has_key("amenity"),
+        ),
+        model.Polygon.tags.has_key("name"),
+    )
+
+    return [polygon.tags for polygon in q]
+
 def address_from_tags(tags):
     keys = ["street", "housenumber"]
     if g.street_number_first:
@@ -989,6 +1004,10 @@ def api_find_osm_candidates(item_id):
         if hasattr(osm, 'area'):
             cur["area"] = osm.area
 
+        part_of = [i["name"] for i in get_part_of(osm, bounds) if i["name"] != name]
+        if part_of:
+            cur["part_of"] = part_of
+
         nearby.append(cur)
 
     t1 = time() - t0