如何反序列化Django模型对象？

Question

I am fairly new to python and transitioning from Java, so I'll use the Java terminologies as I need to know the equivalent python version of it.

So I have a Django model as described below:

class Order(models.Model) :
    order_id = models.TextField(null=False, blank=False)
    is_completed = models.BooleanField(null=False, blank=False, default=False)

Also I have a kafka broker to process these orders. To push these into a kafka queue, I am transforming them into JSON objects as depicted below:

from django.core import serializers

serialized_obj = serializers.serialize('json', [order])
print("Pushing to kafka topic ", "some_topic")
print(serialized_obj)
send_message("some_topic", serialized_obj)

Now I need this JSON object to be converted back to Django model object, in Java we have something called as Jackson which could have done the same for me, but I am not sure how to do this in Python3.

I tried the below code snippet, it returned me an object of type <generator object Deserializer at 0x7fe000323bf8>

# consumer.py
try:
  print(json.loads(msg.value()))
  print("---------------------------------")
  obj = serializers.deserialize("json", msg.value())
  print(obj)
  except Exception as e:
    import traceback
    print(traceback.format_exc())

How can I achieve this in Python3?

Answer 1

First to serialize the object do this:

from django.core import serializers

d = serializers.serialize('json', Order.objects.all()) # serialize all the objects in Order model

To deserialize the object from it

for obj in serializers.deserialize('json', d):
    print(obj.object) ## return the django model class object

serializers.deserialize() gives an Deserializedobject

To get more details refer Django object deserialization