How to make dynamic field serializer in Django RestFramework - django

Question

I want to add Dynamic Field Array serializer in my drf project:
My get response looks something like this:
{
"title": "some",
"created_at": "2022-03-06T15:59:52.684469Z",
"fields": [
{
"id": 1,
"title": "Some title?",
"parent_field": 1
},
{
"id": 2,
"title": "Yet another fields",
"parent_field": 1
}
]
}
This is the item detail serializer, and fields is another model serializer. I achieved this by using this code:
class AnotherFieldSerializer(serializers.ModelSerializer):
class Meta:
model = AnotherModel
fields = "__all__"
class FirstSerializer(serializers.ModelSerializer):
fields = serializers.SerializerMethodField()
class Meta:
model = FirstModel
fields = "__all__"
def get_fields(self, obj):
serializer_context = {'request': self.context.get('request')}
children = obj.fields
if not children.exists():
return None
serializered_children = FirstSerializer(
children,
many=True,
context=serializer_context
)
return serializered_children.data
This works only for GET requests I want this to also work with POST and PUT requests. So, imagine I want to add/edit an item into my model FIRST model and add fields associated with it by just sending this JSON:
{
"title": "some",
"created_at": "2022-03-06T15:59:52.684469Z",
"fields": [
{
"id": 1,
"title": "Some title?",
},
{
"id": 2,
"title": "Yet another fields",
}
]
}
I know I can get fields from the response and loop through each item to create an instance of Another Model but fields validation will be much harder I think. But if there's more of a drf of doing this thing then it would be great. Also, I have no problem with making another serializer just for POST and PUT requests.
I hope my English was understandable.

Answer 1

You can create a new serializer for validation. To validate multiple items you can do the following,
class PostSerializer(serializers.Serializer):
title = serializers.CharField(max_length=200)
created_at = serializers.DateTimeField()
fields = FirstSerializer(many=True) # your model serializer for the FirstModel
Ref : https://www.django-rest-framework.org/api-guide/serializers/#listserializer