How to create related queries in django rest?

Question

Django

Hello. Immediately for example.
There is model A and model B.
The client that works with my API wants data from model B, but he does not have any data for this to make a request. Therefore, it goes to model A, receives data, and based on this data, goes to model B and receives data from there.
As a result, two requests. And if there are 5 such models? It is necessary to fulfill five requests at least. Is there any practice for implementing related requests in Django Rest?

Answer 1

I suspect you need something like this:

class CompanyContactSerializer(serializers.ModelSerializer):
    class Meta:
        model = models.CompanyContact
        fields = ('id', 'type', 'value')


class CompanyDetailSerializer(serializers.ModelSerializer):
    contacts = CompanyContactSerializer(many=True, read_only=True)
    class Meta:
        model = models.Company
        fields = ('id', 'name', 'contacts')

So when you request a company, you immediately get its contacts. More details in the documentation .
However, it should be borne in mind that in this case there will be more requests to the database, but you can try to reduce them .