[UK] Script to copy/create 2024 NI constituencies.

mapit_gb/management/commands/mapit_UK_2024_update_ni.py

@@ -0,0 +1,42 @@
+# This script is to be run as a one-off after an import of the June 2024 OS
+# Boundary-Line in order to update the Northern Ireland UK constituencies.
+# It assumes you previously already loaded in all the new boundaries in the
+# 'WMCF' area type, taken from
+# https://pages.mysociety.org/2025-constituencies/datasets/parliament_con_2025/latest
+
+from django.core.management.base import BaseCommand
+from mapit.models import Area, Type
+
+
+def copy_object(obj, new_area):
+    obj.pk = None
+    obj.area = new_area
+    obj.save()
+    print(' ', obj)
+
+
+class Command(BaseCommand):
+    help = 'Update the NI constituencies after the 2024 election'
+
+    def add_arguments(self, parser):
+        parser.add_argument('--commit', action='store_true', dest='commit', help='Actually update the database')
+
+    def handle(self, **options):
+        areas = Area.objects.filter(type__code='WMCF', country__code='N')
+        wmc_type = Type.objects.get(code='WMC')
+        for area in areas:
+            polygons = list(area.polygons.all())
+            names = list(area.names.all())
+            codes = list(area.codes.all())
+            area.pk = None
+            area.type = wmc_type
+            area.generation_low_id = 55
+            area.generation_high_id = 55
+            area.save()
+            print(area)
+            for polygon in polygons:
+                copy_object(polygon, area)
+            for name in names:
+                copy_object(name, area)
+            for code in codes:
+                copy_object(code, area)