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Serializers

Serializers convert complex data (models, querysets) to native Python types renderable as JSON.

Official docs

Serializers — django-rest-framework.org

ModelSerializer​

from rest_framework import serializers
from .models import Article

class ArticleSerializer(serializers.ModelSerializer):
    class Meta:
        model = Article
        fields = ['id', 'title', 'body', 'published']

Validation​

class ArticleSerializer(serializers.ModelSerializer):
    def validate_title(self, value):
        if len(value) < 5:
            raise serializers.ValidationError("Title too short.")
        return value