drf-serpy 0.5.0

Ridiculously fast object serialization

drf-serpy: ridiculously fast object serialization

drf-serpy is a super simple object serialization framework built for speed. drf-serpy serializes complex datatypes (Django Models, custom classes, ...) to simple native types (dicts, lists, strings, ...). The native types can easily be converted to JSON or any other format needed.

The goal of drf-serpy is to be able to do this simply, reliably, and quickly. Since serializers are class based, they can be combined, extended and customized with very little code duplication. This project aims to replace the DRF serializer in terms of deserialization.

Compared to other popular Python serialization frameworks like Django Rest Framework Serializers drf-serpy is at least an order of magnitude faster.

Source

Source at: https://github.com/sergenp/drf-serpy

If you want a feature, send a pull request!

Documentation

Full documentation at: https://drf-serpy.readthedocs.io/en/latest/

Installation

Note that this project is aimed for Django Rest Framework and does not intend to provide deserialization to other frameworks. Original serpy repository can be used for such cases. This is mainly because of the added drf-yasg for swagger generation for the drf-serpy serializers.

$ pip install drf-serpy

Examples

Simple Example

import drf_serpy as serpy

class Foo(object):
    """The object to be serialized."""
    y = 'hello'
    z = 9.5

    def __init__(self, x):
        self.x = x


class FooSerializer(serpy.Serializer):
    """The serializer schema definition."""
    # Use a Field subclass like IntField if you need more validation.
    x = serpy.IntField()
    y = serpy.Field()
    z = serpy.Field()

f = Foo(1)
FooSerializer(f).data
# {'x': 1, 'y': 'hello', 'z': 9.5}

fs = [Foo(i) for i in range(100)]
FooSerializer(fs, many=True).data
# [{'x': 0, 'y': 'hello', 'z': 9.5}, {'x': 1, 'y': 'hello', 'z': 9.5}, ...]

Nested Example

import drf_serpy as serpy

class Nestee(object):
    """An object nested inside another object."""
    n = 'hi'


class Foo(object):
    x = 1
    nested = Nestee()


class NesteeSerializer(serpy.Serializer):
    n = serpy.Field()


class FooSerializer(serpy.Serializer):
    x = serpy.Field()
    # Use another serializer as a field.
    nested = NesteeSerializer()

f = Foo()
FooSerializer(f).data
# {'x': 1, 'nested': {'n': 'hi'}}

Complex Example

import drf_serpy as serpy

class Foo(object):
    y = 1
    z = 2
    super_long_thing = 10

    def x(self):
        return 5


class FooSerializer(serpy.Serializer):
    w = serpy.Field(attr='super_long_thing')
    x = serpy.Field(call=True)
    plus = serpy.MethodField()

    def get_plus(self, obj):
        return obj.y + obj.z

f = Foo()
FooSerializer(f).data
# {'w': 10, 'x': 5, 'plus': 3}

Inheritance Example

import drf_serpy as serpy

class Foo(object):
    a = 1
    b = 2


class ASerializer(serpy.Serializer):
    a = serpy.Field()


class ABSerializer(ASerializer):
    """ABSerializer inherits the 'a' field from ASerializer.

    This also works with multiple inheritance and mixins.
    """
    b = serpy.Field()

f = Foo()
ASerializer(f).data
# {'a': 1}
ABSerializer(f).data
# {'a': 1, 'b': 2}

Swagger Generation Example

Example is available in test_django_app, you can run the app after cloning the project.

python test_django_app/manage.py runserver

Note that the swagger generation is for drf_serpy.Serializer and doesn't care about the inputted model. i.e. the openapi.Schema will be generated based on the serializer attributes.

import drf_serpy as serpy
from drf_yasg.utils import swagger_auto_schema
from rest_framework import status
from rest_framework.response import Response
from rest_framework.viewsets import ModelViewSet

from .models import Post 
from .serializers import drf, serps

# serps.ReadOnlyPostSerializer is this:
# class ReadOnlyPostSerializer(serpy.Serializer):
#     """
#     Sample description to be used in schema
#     """
#     id = serpy.IntField()
#     author = UserSerializer()
#     title = serpy.StrField()
#     content = serpy.StrField()
#     image = serpy.ImageField()
#     tags = TagSerializer(many=True)
#     created = serpy.DateTimeField()
#     updated = serpy.DateTimeField()
#     dummy = serpy.MethodField()
#     is_completed = serpy.MethodField()

#     def get_dummy(self, value) -> List[int]:
#         return list(range(1, 10))

#     # typing is necessary to create schema, otherwise this will throw an assertion error
#     def get_is_completed(self, value) -> bool:
#         return True

class PostViewSet(ModelViewSet):
    queryset = Post.objects.all()
    serializer_class = drf.PostSerializer

    @swagger_auto_schema(
        responses={
            200: ReadOnlyPostSerializer.to_schema(many=True),
        },
    )
    def list(self, request, *args, **kwargs):
        # get your objects
        serializer = serps.ReadOnlyPostSerializer(instance=self.queryset.all(), many=True)
        return Response(data=serializer.data, status=status.HTTP_200_OK)

Generated Swagger:

Generic serializer swagger generation example:

# class CommentSerializer(drf_serpy.Serializer):
#     id = drf_serpy.IntField()
#     user = UserSerializer()
#     post = ReadOnlyPostSerializer()
#     comment = drf_serpy.StrField()
#     created = drf_serpy.DateTimeField()
#     updated = drf_serpy.DateTimeField()


# class LinkSerializer(drf_serpy.Serializer):
#     next = drf_serpy.StrField()
#     previous = drf_serpy.StrField()


# class PaginationSerializer(drf_serpy.Serializer):
#     links = LinkSerializer()
#     count = drf_serpy.IntField()
#     current_page = drf_serpy.IntField()
#     page_size = drf_serpy.IntField()
#     results = drf_serpy.Serializer()

class CommentViewSet(ModelViewSet):
    queryset = Comment.objects.all()
    serializer_class = drf.CommentSerializer

    @swagger_auto_schema(
        responses={
            200: PaginationSerializer.to_schema(serializer=CommentSerializer(many=True)),
        },
    )
    def list(self, request, *args, **kwargs):
        self.serializer_class = serps.CommentSerializer
        return super().list(request, *args, **kwargs)

Generated Swagger:

License

drf-serpy is free software distributed under the terms of the MIT license. See the LICENSE file.