============================ django-rest-framework-tricks

Collection of various tricks for Django REST framework <https://pypi.python.org/pypi/djangorestframework>_.

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Prerequisites

• Django 2.2, 3.0, 3.1, 3.2, 4.0 and 4.1.
• Python 3.7, 3.8, 3.9, 3.10 and 3.11.

Dependencies

• djangorestframework: Initially written with 3.6.3, but nowadays tested with >=3.10,<3.14. May (still) work on earlier- or (even) support later- versions, although not guaranteed.

Installation

(1) Install latest stable version from PyPI:

.. code-block:: sh

    pip install django-rest-framework-tricks

or latest development version from GitHub:

.. code-block:: sh

    pip install https://github.com/barseghyanartur/django-rest-framework-tricks/archive/master.tar.gz

(2) Add rest_framework and rest_framework_tricks to INSTALLED_APPS:

.. code-block:: python

    INSTALLED_APPS = (
        # ...
        # REST framework
        'rest_framework',

        # REST framework tricks (this package)
        'rest_framework_tricks',

        # ...
    )

Documentation

Documentation is available on Read the Docs <http://django-rest-framework-tricks.readthedocs.io/>_.

Main features and highlights

• Nested serializers_: Nested (writable) serializers for non-relational fields.
• Ordering filter_: Developer friendly names for ordering options (for instance, for related field names).
• File field with restrictions_: Restrict the file field (in size).

Usage examples

Nested serializers

Nested serializers for non-relational fields.

Our imaginary Book model consists of the following (non-relational) Django model fields:

• title: CharField
• description: TextField
• summary: TextField
• publication_date: DateTimeField
• state: CharField (with choices)
• isbn: CharField
• price: DecimalField
• pages: IntegerField
• stock_count: IntegerField

In our REST API, we want to split the Book serializer into parts using nested serializers to have the following structure:

.. code-block:: javascript

{
    "id": "",
    "title": "",
    "description": "",
    "summary": "",
    "publishing_information": {
        "publication_date": "",
        "isbn": "",
        "pages": ""
    },
    "stock_information": {
        "stock_count": "",
        "price": "",
        "state": ""
    }
}

Sample model

The only variation from standard implementation here is that we declare two
``NestedProxyField`` fields on the ``Book`` model level for to be used in
``BookSerializer`` serializer.

Note, that the change does not cause model change (no migrations or
whatsoever).

Required imports
^^^^^^^^^^^^^^^^

.. code-block:: python

    from django.db import models

    from rest_framework_tricks.models.fields import NestedProxyField

Model definition
^^^^^^^^^^^^^^^^

.. code-block:: python

    BOOK_PUBLISHING_STATUS_PUBLISHED = 'published'
    BOOK_PUBLISHING_STATUS_NOT_PUBLISHED = 'not_published'
    BOOK_PUBLISHING_STATUS_IN_PROGRESS = 'in_progress'
    BOOK_PUBLISHING_STATUS_CHOICES = (
        (BOOK_PUBLISHING_STATUS_PUBLISHED, "Published"),
        (BOOK_PUBLISHING_STATUS_NOT_PUBLISHED, "Not published"),
        (BOOK_PUBLISHING_STATUS_IN_PROGRESS, "In progress"),
    )
    BOOK_PUBLISHING_STATUS_DEFAULT = BOOK_PUBLISHING_STATUS_PUBLISHED


    class Book(models.Model):
        """Book."""

        title = models.CharField(max_length=100)
        description = models.TextField(null=True, blank=True)
        summary = models.TextField(null=True, blank=True)
        publication_date = models.DateField()
        state = models.CharField(max_length=100,
                                 choices=BOOK_PUBLISHING_STATUS_CHOICES,
                                 default=BOOK_PUBLISHING_STATUS_DEFAULT)
        isbn = models.CharField(max_length=100, unique=True)
        price = models.DecimalField(max_digits=10, decimal_places=2)
        pages = models.PositiveIntegerField(default=200)
        stock_count = models.PositiveIntegerField(default=30)

        # List the fields for `PublishingInformationSerializer` nested
        # serializer. This does not cause a model change.
        publishing_information = NestedProxyField(
            'publication_date',
            'isbn',
            'pages',
        )

        # List the fields for `StockInformationSerializer` nested serializer.
        # This does not cause a model change.
        stock_information = NestedProxyField(
            'stock_count',
            'price',
            'state',
        )

        class Meta:
            """Meta options."""

            ordering = ["isbn"]

        def __str__(self):
            return self.title

Sample serializers

At first, we add nested_proxy_field property to the Meta class definitions of PublishingInformationSerializer and StockInformationSerializer nested serializers.

Then we define our (main) BookSerializer class, which is going to be used as a serializer_class of the BookViewSet. We inherit the BookSerializer from rest_framework_tricks.serializers.HyperlinkedModelSerializer instead of the one of the Django REST framework. There's also a rest_framework_tricks.serializers.ModelSerializer available.

Required imports ^^^^^^^^^^^^^^^^

.. code-block:: python

from rest_framework import serializers
from rest_framework_tricks.serializers import (
    HyperlinkedModelSerializer,
)

from .models import Book

Defining the serializers ^^^^^^^^^^^^^^^^^^^^^^^^

.. note::

If you get validation errors about null-values, add ``allow_null=True``
next to the ``required=False`` for serializer field definitions.

Nested serializer

.. code-block:: python

class PublishingInformationSerializer(serializers.ModelSerializer):
    """Publishing information serializer."""

    publication_date = serializers.DateField(required=False)
    isbn = serializers.CharField(required=False)
    pages = serializers.IntegerField(required=False)

    class Meta:
        """Meta options."""

        model = Book
        fields = (
            'publication_date',
            'isbn',
            'pages',
        )
        # Note, that this should be set to True to identify that
        # this serializer is going to be used as `NestedProxyField`.
        nested_proxy_field = True

Nested serializer

.. code-block:: python

class StockInformationSerializer(serializers.ModelSerializer):
    """Stock information serializer."""

    class Meta:
        """Meta options."""

        model = Book
        fields = (
            'stock_count',
            'price',
            'state',
        )
        # Note, that this should be set to True to identify that
        # this serializer is going to be used as `NestedProxyField`.
        nested_proxy_field = True

Main serializer to be used in the ViewSet

.. code-block:: python

# Note, that we are importing the ``HyperlinkedModelSerializer`` from
# the `rest_framework_tricks.serializers`. Names of the serializers
# should match the names of model properties set with ``NestedProxyField``
# fields.
class BookSerializer(HyperlinkedModelSerializer):
    """Book serializer."""

    publishing_information = PublishingInformationSerializer(required=False)
    stock_information = StockInformationSerializer(required=False)

    class Meta:
        """Meta options."""

        model = Book
        fields = (
            'url',
            'id',
            'title',
            'description',
            'summary',
            'publishing_information',
            'stock_information',
        )

Sample ViewSet

Absolutely no variations from standard implementation here.

Required imports
^^^^^^^^^^^^^^^^

.. code-block:: python

    from rest_framework.viewsets import ModelViewSet
    from rest_framework.permissions import AllowAny

    from .models import Book
    from .serializers import BookSerializer

ViewSet definition
^^^^^^^^^^^^^^^^^^

.. code-block:: python

    class BookViewSet(ModelViewSet):
        """Book ViewSet."""

        queryset = Book.objects.all()
        serializer_class = BookSerializer
        permission_classes = [AllowAny]

Sample OPTIONS call
^^^^^^^^^^^^^^^^^^^

.. code-block:: text

    OPTIONS /books/api/books/
    HTTP 200 OK
    Allow: GET, POST, HEAD, OPTIONS
    Content-Type: application/json
    Vary: Accept

.. code-block:: javascript

    {
        "name": "Book List",
        "description": "Book ViewSet.",
        "renders": [
            "application/json",
            "text/html"
        ],
        "parses": [
            "application/json",
            "application/x-www-form-urlencoded",
            "multipart/form-data"
        ],
        "actions": {
            "POST": {
                "id": {
                    "type": "integer",
                    "required": false,
                    "read_only": true,
                    "label": "ID"
                },
                "title": {
                    "type": "string",
                    "required": true,
                    "read_only": false,
                    "label": "Title",
                    "max_length": 100
                },
                "description": {
                    "type": "string",
                    "required": false,
                    "read_only": false,
                    "label": "Description"
                },
                "summary": {
                    "type": "string",
                    "required": false,
                    "read_only": false,
                    "label": "Summary"
                },
                "publishing_information": {
                    "type": "nested object",
                    "required": false,
                    "read_only": false,
                    "label": "Publishing information",
                    "children": {
                        "publication_date": {
                            "type": "date",
                            "required": false,
                            "read_only": false,
                            "label": "Publication date"
                        },
                        "isbn": {
                            "type": "string",
                            "required": false,
                            "read_only": false,
                            "label": "Isbn"
                        },
                        "pages": {
                            "type": "integer",
                            "required": false,
                            "read_only": false,
                            "label": "Pages"
                        }
                    }
                },
                "stock_information": {
                    "type": "nested object",
                    "required": false,
                    "read_only": false,
                    "label": "Stock information",
                    "children": {
                        "stock_count": {
                            "type": "integer",
                            "required": false,
                            "read_only": false,
                            "label": "Stock count"
                        },
                        "price": {
                            "type": "decimal",
                            "required": true,
                            "read_only": false,
                            "label": "Price"
                        },
                        "state": {
                            "type": "choice",
                            "required": false,
                            "read_only": false,
                            "label": "State",
                            "choices": [
                                {
                                    "value": "published",
                                    "display_name": "Published"
                                },
                                {
                                    "value": "not_published",
                                    "display_name": "Not published"
                                },
                                {
                                    "value": "in_progress",
                                    "display_name": "In progress"
                                }
                            ]
                        }
                    }
                }
            }
        }
    }

Unlimited nesting depth

Unlimited nesting depth is supported.

Our imaginary Author model could consist of the following (non-relational) Django model fields:

• salutation: CharField
• name: CharField
• email: EmailField
• birth_date: DateField
• biography: TextField
• phone_number: CharField
• website: URLField
• company: CharField
• company_phone_number: CharField
• company_email: EmailField
• company_website: URLField

In our REST API, we could split the Author serializer into parts using nested serializers to have the following structure:

.. code-block:: javascript

{
    "id": "",
    "salutation": "",
    "name": "",
    "birth_date": "",
    "biography": "",
    "contact_information": {
        "personal_contact_information": {
            "email": "",
            "phone_number": "",
            "website": ""
        },
        "business_contact_information": {
            "company": "",
            "company_email": "",
            "company_phone_number": "",
            "company_website": ""
        }
    }
}

Our model would have to be defined as follows (see Advanced usage examples for complete model definition):

.. code-block:: python

class Author(models.Model):
    """Author."""

    # ...

    # List the fields for `PersonalContactInformationSerializer` nested
    # serializer. This does not cause a model change.
    personal_contact_information = NestedProxyField(
        'email',
        'phone_number',
        'website',
    )

    # List the fields for `BusinessContactInformationSerializer` nested
    # serializer. This does not cause a model change.
    business_contact_information = NestedProxyField(
        'company',
        'company_email',
        'company_phone_number',
        'company_website',
    )

    # List the fields for `ContactInformationSerializer` nested
    # serializer. This does not cause a model change.
    contact_information = NestedProxyField(
        'personal_contact_information',
        'business_contact_information',
    )

    # ...

See the Advanced usage examples <https://github.com/barseghyanartur/django-rest-framework-tricks/blob/master/ADVANCED_USAGE_EXAMPLES.rst#nested-serializers>_ for complete example.

Ordering filter

Developer friendly names for ordering options (for instance, for related field names) for making better APIs.

Sample model

Absolutely no variations from standard implementation here.

Required imports
^^^^^^^^^^^^^^^^

.. code-block:: python

    from django.db import models


Model definition
^^^^^^^^^^^^^^^^

.. code-block:: python

    class Profile(models.Model):
        """Profile."""

        user = models.ForeignKey('auth.User')
        biography = models.TextField()
        hobbies = models.TextField()


Sample serializer

Absolutely no variations from standard implementation here.

Required imports ^^^^^^^^^^^^^^^^

.. code-block:: python

from rest_framework import serializers

from .models import Profile

Defining the serializers ^^^^^^^^^^^^^^^^^^^^^^^^

.. code-block:: python

class ProfileSerializer(serializers.ModelSerializer):
    """Profile serializer."""

    username = serializers.CharField(source='user.username', read_only=True)
    full_name = serializers.SerializerMethodField()
    email = serializers.CharField(source='user.email', read_only=True)

    class Meta(object):

    model = Profile
    fields = (
        'id',
        'username',
        'full_name',
        'email',
        'biography',
        'hobbies',
    )

    def get_full_name(self, obj):
        return obj.user.get_full_name()

Sample ViewSet

The only variation from standard implementation here is that we
use ``rest_frameworks_tricks.filters.OrderingFilter`` instead
of ``rest_framework.filters.OrderingFilter``.

Required imports
^^^^^^^^^^^^^^^^

.. code-block:: python

    from rest_framework.viewsets import ModelViewSet
    from rest_framework.permissions import AllowAny
    from rest_framework_tricks.filters import OrderingFilter

    from .models import Profile
    from .serializers import ProfileSerializer

ViewSet definition
^^^^^^^^^^^^^^^^^^

.. code-block:: python

    class ProfileViewSet(ModelViewSet):
        """Profile ViewSet."""

        queryset = Profile.objects.all()
        serializer_class = ProfileSerializer
        permission_classes = [AllowAny]
        filter_backends = (OrderingFilter,)
        ordering_fields = {
            'id': 'id',
            'username': 'user__username',
            'email': 'user__email',
            'full_name': ['user__first_name', 'user__last_name']
        }
        ordering = ('id',)

Sample GET calls
^^^^^^^^^^^^^^^^

Note, that our ordering options are now equal to the field names in the
serializer (JSON response). API becomes easier to use/understand that way.

.. code-block:: text

    GET /api/profile/?ordering=email
    GET /api/profile/?ordering=-username
    GET /api/profile/?ordering=full_name
    GET /api/profile/?ordering=-full_name

File field with restrictions
----------------------------

Sample model
~~~~~~~~~~~~

Absolutely no variations from standard implementation here.

Required imports
^^^^^^^^^^^^^^^^

.. code-block:: python

    from django.db import models


Model definition
^^^^^^^^^^^^^^^^

.. code-block:: python

    class Profile(models.Model):
        """Upload."""

        username = models.CharField(max_length=255)
        resume = models.FileField()


Sample serializer

Required imports ^^^^^^^^^^^^^^^^

.. code-block:: python

from rest_framework import serializers
from rest_framework_tricks.fields import ConstrainedFileField

from .models import Upload

Defining the serializers ^^^^^^^^^^^^^^^^^^^^^^^^

.. code-block:: python

class ProfileSerializer(serializers.ModelSerializer):
    """Profile serializer."""

    username = serializers.CharField()
    # Restrict resume to 5Mb
    resume = ConstrainedFileField(max_upload_size=5_242_880)

    class Meta(object):

    model = Profile
    fields = (
        'id',
        'username',
        'resume',
    )

Demo

Run demo locally

In order to be able to quickly evaluate the django-rest-framework-tricks, a demo app (with a quick installer) has been created (works on Ubuntu/Debian, may work on other Linux systems as well, although not guaranteed). Follow the instructions below to have the demo running within a minute.

Grab and run the latest rest_framework_tricks_demo_installer.sh demo installer:

.. code-block:: sh

wget -O - https://raw.github.com/barseghyanartur/django-rest-framework-tricks/master/examples/rest_framework_tricks_demo_installer.sh | bash

Open your browser and test the app.

.. code-block:: text

http://127.0.0.1:8001/books/api/

Testing

Project is covered with tests.

To test with all supported Python/Django versions type:

.. code-block:: sh

tox

To test against specific environment, type:

.. code-block:: sh

tox -e py39-django32

To test just your working environment type:

.. code-block:: sh

pytest -vvv

To run a single test in your working environment type:

.. code-block:: sh

pytest -vvv src/rest_framework_tricks/tests/test_nested_proxy_field.py

.. code-block:: sh

pip install -r examples/requirements/test.txt

Writing documentation

Keep the following hierarchy.

.. code-block:: text

=====
title
=====

header
======

sub-header
----------

sub-sub-header
~~~~~~~~~~~~~~

sub-sub-sub-header
^^^^^^^^^^^^^^^^^^

sub-sub-sub-sub-header
++++++++++++++++++++++

sub-sub-sub-sub-sub-header
**************************

License

GPL-2.0-only OR LGPL-2.1-or-later

Support

For any security issues contact me at the e-mail given in the Author_ section.

For overall issues, go to GitHub <https://github.com/barseghyanartur/django-rest-framework-tricks/issues>_.

Author

Artur Barseghyan [email protected]