Sets default value for district corporation field

stages/migrations/0016_populate_corp_district.py

@@ -0,0 +1,26 @@
+from django.db import migrations
+
+
+def populate_district(apps, schema_editor):
+    Corporation = apps.get_model('stages', 'Corporation')
+
+    for corp in Corporation.objects.filter(district=''):
+        pcode = int(corp.pcode)
+        if pcode in range(2000, 2334) or pcode in range(2400, 2417) or pcode in [2523, 2525, 2616]:
+            corp.district = 'NE'
+            corp.save()
+        elif pcode in range(2336, 2365) or pcode in range(2714, 2719) or pcode in range(2800, 2955):
+            corp.district = 'JU'
+            corp.save()
+        elif pcode in [2333, 2346] or pcode in range(2500, 2521) or pcode in range(2532, 2763) or pcode in range(3000, 3865):
+            corp.district = 'BE'
+            corp.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stages', '0015_added_supervision_attest_field'),
+    ]
+
+    operations = [migrations.RunPython(populate_district)]