old_contents: from django.conf import settings
  from django.core.management.base import BaseCommand
  
  class Command(BaseCommand):
  
      help = "Update value type of fs_site and fs_uuid in mongo instances to make string type to int type"
  
      def handle(self, *args, **kwargs):
          xform_instances = settings.MONGO_DB.instances
          
          #type 2 is for string type
          query = {'$or':[{'fs_site':{'$type':2}}, {'fs_uuid':{'$type':2}}]}
          
          cursor = xform_instances.find(query)
          for record in cursor:
              fs_site = record['fs_site']
              if fs_site == '':
                  new_fs_site = None
              else:
                  new_fs_site = int(fs_site)
              fs_uuid = record['fs_uuid']
              if fs_uuid == '':
                  new_fs_uuid = None
              elif fs_uuid == 'None':
                  new_fs_uuid = None
              elif fs_uuid == 'NoneType':
                  new_fs_uuid = None
              else:
                  new_fs_uuid = int(fs_uuid)
              xform_instances.update({'_id':record['_id']},{'$set':{'fs_site':new_fs_site, 'fs_uuid':new_fs_uuid}})
              print('Updating mongo instance for ' + str(record['_id']))
          print('Mongo instances updated.......')
  
new_contents: from django.conf import settings
  from django.core.management.base import BaseCommand
  
  class Command(BaseCommand):
  
      help = "Update value type of fs_site and fs_uuid in mongo instances to make string type to int type"
  
      def handle(self, *args, **kwargs):
          xform_instances = settings.MONGO_DB.instances
          
          #type 2 is for string type
          query = {'$or':[{'fs_site':{'$type':2}}, {'fs_uuid':{'$type':2}}]}
          
          cursor = xform_instances.find(query)
          for record in cursor:
              fs_site = record['fs_site']
              if fs_site == '':
                  new_fs_site = None
              else:
                  new_fs_site = int(fs_site)
              fs_uuid = record['fs_uuid']
              if fs_uuid == '':
                  new_fs_uuid = None
              elif fs_uuid == 'None':
                  new_fs_uuid = None
              elif fs_uuid == 'NoneType':
                  new_fs_uuid = None
              elif fs_uuid == None:
                  new_fs_uuid = fs_uuid
              else:
                  new_fs_uuid = int(fs_uuid)
              xform_instances.update({'_id':record['_id']},{'$set':{'fs_site':new_fs_site, 'fs_uuid':new_fs_uuid}})
              print('Updating mongo instance for ' + str(record['_id']))
          print('Mongo instances updated.......')
  
subject: update mongo management command refine