input: 
  def load_properties_from_json(fixture_file: str, fixture_folder: str) -> int:
      """Loads a JSON fixture file, extracts properties from it, creates Property objects from the properties, and saves them to the database. Returns the number of properties saved.
  
      >>> load_properties_from_json('properties.json', 'models/fixtures')
      0
      >>> load_properties_from_json('test_properties.json', 'models/fixtures')
      3
      """
      from __future__ import (
          print_function,
          unicode_literals,
          absolute_import
      )
  
      import json
      import os
      from app.models.properties import Property
  
      base_path = os.path.abspath('.')
      path = os.path.sep.join([base_path, 'app', fixture_folder, fixture_file])
  
      properties_to_save = []
  
      with open(path) as file_:
          data = json.load(file_)
      properties = data['properties']
      for property_ in properties:
          property_.pop('id', None)
          properties_to_save.append(Property(**property_))
      Property.objects.insert(properties_to_save)
  
      return len(properties_to_save)
  
output:     return len(properties_to_save)