Add election page under crossroads and custom

#188 (closed)

district/models.py

@@ -1072,7 +1072,11 @@ class DistrictElectionRootPage(RoutablePageMixin, Page):
 
     ### RELATIONS
 
-    parent_page_types = ["district.DistrictHomePage"]
+    parent_page_types = [
+        "district.DistrictHomePage",
+        "district.DistrictCustomPage",
+        "district.DistrictCrossroadPage",
+    ]
     subpage_types = [
         "district.DistrictElectionCampaignPage",
         "district.DistrictGeoFeatureCollectionPage",
@@ -1384,7 +1388,7 @@ class DistrictCustomPage(
     ### RELATIONS
 
     parent_page_types = ["district.DistrictHomePage", "district.DistrictCrossroadPage"]
-    subpage_types = []
+    subpage_types = ["district.DistrictElectionRootPage"]
 
     ### OTHERS