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< title > Returning URLs - Django REST framework< / title >
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< li class = "main" > < a href = "#returning-urls" > Returning URLs< / a > < / li >
< li > < a href = "#reverse" > reverse< / a > < / li >
< li > < a href = "#reverse_lazy" > reverse_lazy< / a > < / li >
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< p > < a class = "github" href = "https://github.com/tomchristie/django-rest-framework/tree/master/rest_framework/reverse.py" > < span class = "label label-info" > reverse.py< / span > < / a > < / p >
< h1 id = "returning-urls" > Returning URLs< / h1 >
< blockquote >
< p > The central feature that distinguishes the REST architectural style from other network-based styles is its emphasis on a uniform interface between components.< / p >
< p > — Roy Fielding, < a href = "http://www.ics.uci.edu/~fielding/pubs/dissertation/rest_arch_style.htm#sec_5_1_5" > Architectural Styles and the Design of Network-based Software Architectures< / a > < / p >
< / blockquote >
< p > As a rule, it's probably better practice to return absolute URIs from your Web APIs, such as < code > http://example.com/foobar< / code > , rather than returning relative URIs, such as < code > /foobar< / code > .< / p >
< p > The advantages of doing so are:< / p >
< ul >
< li > It's more explicit.< / li >
< li > It leaves less work for your API clients.< / li >
< li > There's no ambiguity about the meaning of the string when it's found in representations such as JSON that do not have a native URI type.< / li >
< li > It makes it easy to do things like markup HTML representations with hyperlinks.< / li >
< / ul >
< p > REST framework provides two utility functions to make it more simple to return absolute URIs from your Web API.< / p >
< p > There's no requirement for you to use them, but if you do then the self-describing API will be able to automatically hyperlink its output for you, which makes browsing the API much easier.< / p >
< h2 id = "reverse" > reverse< / h2 >
< p > < strong > Signature:< / strong > < code > reverse(viewname, *args, **kwargs)< / code > < / p >
< p > Has the same behavior as < a href = "https://docs.djangoproject.com/en/dev/topics/http/urls/#reverse" > < code > django.core.urlresolvers.reverse< / code > < / a > , except that it returns a fully qualified URL, using the request to determine the host and port.< / p >
< p > You should < strong > include the request as a keyword argument< / strong > to the function, for example:< / p >
< pre class = "prettyprint lang-py" > < code > from rest_framework.reverse import reverse
from rest_framework.views import APIView
from django.utils.timezone import now
class APIRootView(APIView):
def get(self, request):
year = now().year
data = {
...
'year-summary-url': reverse('year-summary', args=[year], request=request)
}
return Response(data)
< / code > < / pre >
< h2 id = "reverse_lazy" > reverse_lazy< / h2 >
< p > < strong > Signature:< / strong > < code > reverse_lazy(viewname, *args, **kwargs)< / code > < / p >
< p > Has the same behavior as < a href = "https://docs.djangoproject.com/en/dev/topics/http/urls/#reverse-lazy" > < code > django.core.urlresolvers.reverse_lazy< / code > < / a > , except that it returns a fully qualified URL, using the request to determine the host and port.< / p >
< p > As with the < code > reverse< / code > function, you should < strong > include the request as a keyword argument< / strong > to the function, for example:< / p >
< pre class = "prettyprint lang-py" > < code > api_root = reverse_lazy('api-root', request=request)
< / code > < / pre >
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