Django-rest-framework: disable nested fields - json

Question

I'm working with Django REST Framework and I
I have a serializer called QuestionSerializer where I specified 3 fields that I need to have in my response: id, json and explanation.
Since I'm using JSONField in a PostgreSQL Database, my json field is a json stored inside the db and I render it using JSONSerializerField.
Here's my code:
class JSONSerializerField(serializers.Field):
""" Serializer for JSONField -- required to make field writable"""
def to_internal_value(self, data):
return data
def to_representation(self, value):
return value
class QuestionSerializer(serializers.ModelSerializer):
content = JSONSerializerField(source='json')
class Meta:
model = Question
fields = ('id', 'content', 'explanation')
So, every time I'll use QuestionSerializer my response will be something like this:
{
"id": 1,
"content": {
"question": "question",
"answers": [
{"answer": "answer"},
{"answer": "answer"},
{"answer": "answer"},
{"answer": "answer"},
{"answer": "answer"}
],
}
"explanation": "explanation"
}
But I need to remove "content" field to have a response like:
{
"id": 1,
"question": "question",
"answers": [
{"answer": "answer"},
{"answer": "answer"},
{"answer": "answer"},
{"answer": "answer"},
{"answer": "answer"}
],
"explanation": "explanation"
}
What I should do?
Thanks!

Answer 1

you can make content write_only field and use it to just store data. Add two new read_only fields and use them to get data like:
class QuestionSerializer(serializers.ModelSerializer):
content = JSONSerializerField(source='json', write_only=True)
question = serializers.SerializerMethodField()
answers = serializers.SerializerMethodField()
class Meta:
model = Question
fields = ('id', 'content','question', 'answers', 'explanation')
def get_questions(self, obj):
return obj.content['question']
def get_answers(self, obj):
return obj.content['answers']

Answer 2

I found the right solution. I removed 'content' field and JSONSerializerField class and I started working on my json using SerializerMethodField.
class QuestionSerializer(serializers.ModelSerializer):
question = serializers.SerializerMethodField()
answers = serializers.SerializerMethodField()
class Meta:
model = Question
fields = ('id', 'question', 'answers', 'explanation')
def get_question(self, obj):
return obj.json['question']
def get_answers(self, obj):
return obj.json['answers']

Answer 3

You should update your Field so that it returns / read the content directly:
class JSONSerializerField(serializers.Field):
""" Serializer for JSONField -- required to make field writable"""
def to_internal_value(self, data):
return {'content': data}
def to_representation(self, value):
return value['content']