add command to correct duplicate areas

Author: jperelli

apps/catastro/management/commands/deduplicate_areas.py

@@ -0,0 +1,58 @@
+from django.core.management.base import BaseCommand
+from apps.catastro.models import AdministrativeArea
+from django.contrib.postgres.aggregates import ArrayAgg
+from django.db.models import Count
+
+
+class Command(BaseCommand):
+    help = 'remove duplicated areas'
+
+    """
+      select
+        osm_type,
+        osm_id,
+        count(*),
+        array_agg(id),
+        array_agg(st_area(geometry)),
+        array_agg(name)
+      from
+        catastro_administrativearea
+      group by
+        osm_type,
+        osm_id
+      having
+        count(*)>1
+      ;
+    """
+
+    def handle(self, *args, **options):
+        aa = AdministrativeArea.objects.values('osm_type', 'osm_id').order_by().annotate(ids=ArrayAgg('id'), count_id=Count('id')).filter(count_id__gt=1)            
+                
+        for a in aa:
+            a0 = AdministrativeArea.objects.get(id=a['ids'][0])
+            a1 = AdministrativeArea.objects.get(id=a['ids'][1])
+            d0 = a0.get_depth()
+            d1 = a1.get_depth()
+            d0parent = a0.get_parent()
+            d1parent = a1.get_parent()
+            d0childs = a0.get_children_count()
+            d1childs = a1.get_children_count()
+            if d0childs > 0 or d1childs > 0:
+                print(f'Cant choose {a0.osm_type} {a0.osm_id} {a0.name} because has childs')
+                return None
+            if d0 > d1:
+                print(f'Choosing less depth')
+                a1.delete()
+            elif d0 < d1:
+                print(f'Choosing less depth')
+                a0.delete()
+            else:
+                areadiff = d0parent.geometry.area - d1parent.geometry.area
+                if areadiff > 0.00001:
+                    print(f'Choosing bigger parent area by a margin of 0.00001')
+                    a0.delete()
+                elif areadiff < -0.00001:
+                    print(f'Choosing bigger parent area by a margin of 0.00001')
+                    a1.delete()
+                else:
+                    print(f'Cant choose {a0.osm_type} {a0.osm_id} {a0.name} because has same area by a margin of 0.00001')