HTTP REST toolkit for Django
Django Restlayer is a very simple to use toolkit to create RESTful APIs for your Django projects or apps.
- Allows you to respect HTTP methods and headers within your application.
- Class based resources.
- Simple to code.
- Form validation in case you need it.
- For Django 1.4: pip install django-restlayer==0.8.5
- For Django 1.5+: pip install django-restlayer
Django Restlayer doesn’t need any configuration nor any app in INSTALLED_APPS settings.
from django.conf.urls import patterns, url urlpatterns = patterns('', url(r'^$', 'myapp.resources.simple', name='simple'), )
from restlayer import Resource, Response # Our resource class class SimpleResponse(Response): def response_get(self, request): return ['foo', 'bar'] # Resource (a callable object or a view if you prefer) simple = Resource(SimpleResponse)
That’s it. Now, query your development server
curl -s -v -H "accept:application/json" http://localhost:8000/ > GET /api/ HTTP/1.1 > User-Agent: curl/7.33.0 > Host: localhost > accept:application/json > < HTTP/1.1 200 OK < Server: nginx/1.4.3 < Date: Thu, 28 Nov 2013 14:34:15 GMT < Content-Type: application/json; charset=UTF-8 < Transfer-Encoding: chunked < Connection: keep-alive < Vary: Accept-Language, Cookie < Content-Language: en < [ "foo", "bar" ]
All your responses should inherit restlayer.Response class. Then, add methods named response_VERB where VERB is an HTTP verb. To handle GET responses, you need to create a response_get method, for POST, response_post. Each response_VERB method acts as a view with needed arguments. A basic example:
from restlayer import Response class SimpleResponse(Response): def response_get(self, request, my_id): # This method will match a URL pattern with "my_id" return "foo"
Predefined response methods
There are two predefined response methods:
- response_options returns an empty 204 response with Allow header.
- response_head calls response_get if any and returns it without body.
You can set serializers and deserializers properties. They set how data are going to be serialized (out) or unserialized (in). In this example, we add a silly serializer for text/plain:
class SimpleResponse(Response): serializers = Response.serializers + ( ('text/plain', lambda x: return str(x)) )
Well, that won’t work very well but you have the idea. serializers is a list of tuples of mime types and callables getting data as only parameter. deserializers is the same thing for accepted data types (callable takes request as only argument).
Default formats are:
Responses are valid HttpResponse objects
restlayer.Response instances are valid django.http.HttpResponse objects. Thus you can:
- Add any header you want to your response setting self['my-header'] before returning data;
- Change status code with self.status_code;
- Return self if you need to set a specific response content without using serializers.
Your response class should be wrapped within a restlayer.Resource class. The resulting instance is a callable acting like a classic view. You can extend this class to create your own resource. Simply override __call__ method.
from restlayer import Resource class SillyResource(Resource): def __call__(self, request, *args, **kwargs): rsp = super(SillyResource, self).__call__(request, *args, **kwargs) rsp.status_code = 401 rsp['Content-Type'] = 'text/plain' return rsp
Responses for Django models
If you are working with Django models, you can use restlayer.ModelResponse. Using this parent class for your responses, you can return model instance or queryset. Here is a simple example:
from django.contrib.auth.models import User from restlayer import ModelResponse class SimpleResponse(ModelResponse): fields = ('id', 'name', 'firstname', 'email') def response_get(self, request): return User.objects.all()
That’s it! Using the fields property, you set the fields you want to return in the response.
You can add custom methods to create a specific response field. This method takes two parameters: ìnstance and request. Example:
from django.contrib.auth.models import User from restlayer import ModelResponse class SimpleResponse(ModelResponse): fields = ('id', 'name', 'firstname', 'email', 'other_field') def other_field(self, instance, request): return instance.name.capitalize() def response_get(self, request): return User.objects.all()
You’ll often need to create a resource_uri field to point to another resource in your API. Response class provides two methods to create absolute (with FQDN) URLs:
- _build_absolute_uri(self, request, [location]) only calling request.build_absolute_uri(location) but you can override it if you need.
- reverse(self, request, view, [args, kwargs]) acts as django.core.urlresolvers.reverse but returns an absolute URL.
You might want to paginate your responses. Restlayer Response class provides a simple method for this task: paginate(self, request, object_list, [limit]) which is a simple wrapper around django.core.paginator.Paginator. Resulting response will contain the following headers:
- X-Pages-Next (if next page exists)
- X-Pages-Next-URI (if next page exists)
- X-Pages-Prev (if previous page exists)
- X-Pages-Prev-URI (if previous page exists)
Use the source
I admit this documentation is a bit rough. Don’t hesitate to read the source code, there’s no hidden rocket science, only some basic python code :)
Django Restlayer is released under the MIT license. See the LICENSE file for the complete license.
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