Web APIs for Django. 🎸
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Tomasz Rydzyński 4e634ca068 Add error codes to ValidationError
This change addresses use cases that require more information about reported
validation errors. Currently for each error that REST Framework reports users
get only that error's message string. The message can be translated so there's
no good way to recognize programmatically what sort of an error it is.

When building an API that is supposed to return error codes, I've found it very
limiting. For example, I was supposed to differentiate between missing fields
and invalid arguments.

This commit introduces proper error codes handling to the ValidationError.

ValidationError can hold a single error itself (text), a list of those, or a
dictionary mapping errors to fields. Error code is only meaningful for a single
error, and I've added assertions to check for proper usage.

To help with my development, I've added a setting that makes error code a
mandatory argument. Thanks to this, I was able to correct all uses of
ValidationError across the code.

To maintain backward compatibility, I'm not passing error codes when building
compound errors (e.g. a dictionary with all validation errors). However, users
(me) can now monkey patch ValidationError.build_detail method, to store the
codes.
2015-11-09 20:19:17 +01:00
.tx add config and documentation about uploading/downloading translations from Transifex 2015-01-07 11:13:03 +00:00
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docs_theme fixing a trivial HTML tag which is closed twice 2015-09-23 10:51:23 +02:00
requirements Update transifex-client requirement to latest release version 2015-09-14 21:05:28 -07:00
rest_framework Add error codes to ValidationError 2015-11-09 20:19:17 +01:00
tests Add error codes to ValidationError 2015-11-09 20:19:17 +01:00
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requirements.txt Fix typos in comments 2015-08-19 03:55:39 +02:00
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Django REST framework

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Awesome web-browsable Web APIs.

Full documentation for the project is available at http://www.django-rest-framework.org.


Note: We have now released Django REST framework 3.2. For older codebases you may want to refer to the version 2.4.4 source code, and documentation.

For more details see the 3.2 announcement and release notes.


Overview

Django REST framework is a powerful and flexible toolkit for building Web APIs.

Some reasons you might want to use REST framework:

There is a live example API for testing purposes, available here.

Below: Screenshot from the browsable API

Screenshot

Requirements

  • Python (2.7, 3.2, 3.3, 3.4, 3.5)
  • Django (1.7, 1.8, 1.9)

Installation

Install using pip...

pip install djangorestframework

Add 'rest_framework' to your INSTALLED_APPS setting.

INSTALLED_APPS = (
    ...
    'rest_framework',
)

Example

Let's take a look at a quick example of using REST framework to build a simple model-backed API for accessing users and groups.

Startup up a new project like so...

pip install django
pip install djangorestframework
django-admin.py startproject example .
./manage.py syncdb

Now edit the example/urls.py module in your project:

from django.conf.urls import url, include
from django.contrib.auth.models import User
from rest_framework import serializers, viewsets, routers

# Serializers define the API representation.
class UserSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = User
        fields = ('url', 'username', 'email', 'is_staff')


# ViewSets define the view behavior.
class UserViewSet(viewsets.ModelViewSet):
    queryset = User.objects.all()
    serializer_class = UserSerializer


# Routers provide a way of automatically determining the URL conf.
router = routers.DefaultRouter()
router.register(r'users', UserViewSet)


# Wire up our API using automatic URL routing.
# Additionally, we include login URLs for the browsable API.
urlpatterns = [
    url(r'^', include(router.urls)),
    url(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework'))
]

We'd also like to configure a couple of settings for our API.

Add the following to your settings.py module:

INSTALLED_APPS = (
    ...  # Make sure to include the default installed apps here.
    'rest_framework',
)

REST_FRAMEWORK = {
    # Use Django's standard `django.contrib.auth` permissions,
    # or allow read-only access for unauthenticated users.
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.DjangoModelPermissionsOrAnonReadOnly'
    ]
}

That's it, we're done!

./manage.py runserver

You can now open the API in your browser at http://127.0.0.1:8000/, and view your new 'users' API. If you use the Login control in the top right corner you'll also be able to add, create and delete users from the system.

You can also interact with the API using command line tools such as curl. For example, to list the users endpoint:

$ curl -H 'Accept: application/json; indent=4' -u admin:password http://127.0.0.1:8000/users/
[
    {
        "url": "http://127.0.0.1:8000/users/1/",
        "username": "admin",
        "email": "admin@example.com",
        "is_staff": true,
    }
]

Or to create a new user:

$ curl -X POST -d username=new -d email=new@example.com -d is_staff=false -H 'Accept: application/json; indent=4' -u admin:password http://127.0.0.1:8000/users/
{
    "url": "http://127.0.0.1:8000/users/2/",
    "username": "new",
    "email": "new@example.com",
    "is_staff": false,
}

Documentation & Support

Full documentation for the project is available at http://www.django-rest-framework.org.

For questions and support, use the REST framework discussion group, or #restframework on freenode IRC.

You may also want to follow the author on Twitter.

Security

If you believe youve found something in Django REST framework which has security implications, please do not raise the issue in a public forum.

Send a description of the issue via email to rest-framework-security@googlegroups.com. The project maintainers will then work with you to resolve any issues where required, prior to any public disclosure.