input: Write a function to load a JSON fixture file, extract properties from it, create Property objects from the properties, and save them to the database. The function should accept command line arguments to specify the fixture file and folder. The number of saved objects should be printed to the console.
  
  assert main('path_to_fixture_folder')==10
  assert main('non_existent_folder')==0
  assert main('fixture_with_no_properties.json')==0
output: 
  def main(folder):
      import os
      import json
      from myapp.models import Property
      from django.core.management import call_command
  
      fixture_path = os.path.join(folder, 'fixture.json')
      if not os.path.exists(fixture_path):
          return 0
  
      with open(fixture_path, 'r') as file:
          data = json.load(file)
  
      properties = data.get('properties', [])
      saved_count = 0
  
      for prop in properties:
          property_obj = Property(**prop)
          property_obj.save()
          saved_count += 1
  
      print(saved_count)
      return saved_count
  