django-rest-framework

# Django REST Framework

Master Django REST Framework for building robust, scalable RESTful
APIs with proper serialization and authentication.

## Serializers

Build type-safe data serialization with Django REST Framework serializers.

```python
from rest_framework import serializers
from django.contrib.auth.models import User

class UserSerializer(serializers.ModelSerializer):
    post_count = serializers.IntegerField(read_only=True)
    full_name = serializers.SerializerMethodField()

    class Meta:
        model = User
        fields = ['id', 'email', 'name', 'post_count', 'full_name']
        read_only_fields = ['id', 'created_at']
        extra_kwargs = {
            'email': {'required': True},
            'password': {'write_only': True}
        }

    def get_full_name(self, obj):
        return f"{obj.first_name} {obj.last_name}"

class PostSerializer(serializers.ModelSerializer):
    author = UserSerializer(read_only=True)
    author_id = serializers.IntegerField(write_only=True)

    class Meta:
        model = Post
        fields = '__all__'

    def validate_title(self, value):
        if len(value) < 5:
            raise serializers.ValidationError('Title must be at least 5 characters')
        return value

    def validate(self, data):
        if data.get('published') and not data.get('content'):
            raise serializers.ValidationError('Published posts must have content')
        return data

    def create(self, validated_data):
        # Custom creation logic
        post = Post.objects.create(**validated_data)
        # Send notification, etc.
        return post
```

## Custom Fields and Validation

Create custom serializer fields for complex data types.

```python
from rest_framework import serializers

class Base64ImageField(serializers.ImageField):
    """Handle base64 encoded images."""

    def to_internal_value(self, data):
        import base64
        from django.core.files.base import ContentFile

        if isinstance(data, str)