code: def create(self, fields):
          
          try:
              # Cleaning the fields, and check if has `ForeignKey` type.
              cleaned_fields = {}
              for key, value in fields.items():
                  if type(value) is dict:
                      try:
                          if value['type'] == 'fk':
                              fake_fk = self.fake_fk(value['field_name'])
                              cleaned_fields.update({key: fake_fk})
                      except:
                          pass
                  else:
                      cleaned_fields.update({key: value})
  
              # Creating the object from dictionary fields.
              model_class = self.model_class()
              obj = model_class.objects.create(**cleaned_fields)
  
              # The `ManyToManyField` need specific object,
              # so i handle it after created the object.
              for key, value in fields.items():
                  if type(value) is dict:
                      try:
                          if value['type'] == 'm2m':
                              self.fake_m2m(obj, value['field_name'])
                      except:
                          pass
              try:
                  obj.save_m2m()
              except:
                  obj.save()
              return obj
          except Exception as e:
              raise e
docs: Create the object only once.
          So, you need loop to usage.
  
          :param `fields` is dictionary fields.