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< a href = "#setting-the-metadata-scheme" > Setting the metadata scheme< / a >
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< a href = "#creating-schema-endpoints" > Creating schema endpoints< / a >
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< span class = "label label-info" > metadata.py< / span >
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< h1 id = "metadata" > < a class = "toclink" href = "#metadata" > Metadata< / a > < / h1 >
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< blockquote >
< p > [The < code > OPTIONS< / code > ] method allows a client to determine the options and/or requirements associated with a resource, or the capabilities of a server, without implying a resource action or initiating a resource retrieval.< / p >
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< p > — < a href = "https://tools.ietf.org/html/rfc7231#section-4.3.7" > RFC7231, Section 4.3.7.< / a > < / p >
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< / blockquote >
< p > REST framework includes a configurable mechanism for determining how your API should respond to < code > OPTIONS< / code > requests. This allows you to return API schema or other resource information.< / p >
< p > There are not currently any widely adopted conventions for exactly what style of response should be returned for HTTP < code > OPTIONS< / code > requests, so we provide an ad-hoc style that returns some useful information.< / p >
< p > Here's an example response that demonstrates the information that is returned by default.< / p >
< pre > < code > HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
{
"name": "To Do List",
"description": "List existing 'To Do' items, or create a new item.",
"renders": [
"application/json",
"text/html"
],
"parses": [
"application/json",
"application/x-www-form-urlencoded",
"multipart/form-data"
],
"actions": {
"POST": {
"note": {
"type": "string",
"required": false,
"read_only": false,
"label": "title",
"max_length": 100
}
}
}
}
< / code > < / pre >
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< h2 id = "setting-the-metadata-scheme" > < a class = "toclink" href = "#setting-the-metadata-scheme" > Setting the metadata scheme< / a > < / h2 >
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< p > You can set the metadata class globally using the < code > 'DEFAULT_METADATA_CLASS'< / code > settings key:< / p >
< pre > < code > REST_FRAMEWORK = {
'DEFAULT_METADATA_CLASS': 'rest_framework.metadata.SimpleMetadata'
}
< / code > < / pre >
< p > Or you can set the metadata class individually for a view:< / p >
< pre > < code > class APIRoot(APIView):
metadata_class = APIRootMetadata
def get(self, request, format=None):
return Response({
...
})
< / code > < / pre >
< p > The REST framework package only includes a single metadata class implementation, named < code > SimpleMetadata< / code > . If you want to use an alternative style you'll need to implement a custom metadata class.< / p >
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< h2 id = "creating-schema-endpoints" > < a class = "toclink" href = "#creating-schema-endpoints" > Creating schema endpoints< / a > < / h2 >
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< p > If you have specific requirements for creating schema endpoints that are accessed with regular < code > GET< / code > requests, you might consider re-using the metadata API for doing so.< / p >
< p > For example, the following additional route could be used on a viewset to provide a linkable schema endpoint.< / p >
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< pre > < code > @action(methods=['GET'], detail=False)
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def schema(self, request):
meta = self.metadata_class()
data = meta.determine_metadata(request, self)
return Response(data)
< / code > < / pre >
< p > There are a couple of reasons that you might choose to take this approach, including that < code > OPTIONS< / code > responses < a href = "https://www.mnot.net/blog/2012/10/29/NO_OPTIONS" > are not cacheable< / a > .< / p >
< hr / >
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< h1 id = "custom-metadata-classes" > < a class = "toclink" href = "#custom-metadata-classes" > Custom metadata classes< / a > < / h1 >
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< p > If you want to provide a custom metadata class you should override < code > BaseMetadata< / code > and implement the < code > determine_metadata(self, request, view)< / code > method.< / p >
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< p > Useful things that you might want to do could include returning schema information, using a format such as < a href = "https://json-schema.org/" > JSON schema< / a > , or returning debug information to admin users.< / p >
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< h2 id = "example" > < a class = "toclink" href = "#example" > Example< / a > < / h2 >
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< p > The following class could be used to limit the information that is returned to < code > OPTIONS< / code > requests.< / p >
< pre > < code > class MinimalMetadata(BaseMetadata):
"""
Don't include field and other information for `OPTIONS` requests.
Just return the name and description.
"""
def determine_metadata(self, request, view):
return {
'name': view.get_view_name(),
'description': view.get_view_description()
}
< / code > < / pre >
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< p > Then configure your settings to use this custom class:< / p >
< pre > < code > REST_FRAMEWORK = {
'DEFAULT_METADATA_CLASS': 'myproject.apps.core.MinimalMetadata'
}
< / code > < / pre >
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< h1 id = "third-party-packages" > < a class = "toclink" href = "#third-party-packages" > Third party packages< / a > < / h1 >
< p > The following third party packages provide additional metadata implementations.< / p >
< h2 id = "drf-schema-adapter" > < a class = "toclink" href = "#drf-schema-adapter" > DRF-schema-adapter< / a > < / h2 >
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< p > < a href = "https://github.com/drf-forms/drf-schema-adapter" > drf-schema-adapter< / a > is a set of tools that makes it easier to provide schema information to frontend frameworks and libraries. It provides a metadata mixin as well as 2 metadata classes and several adapters suitable to generate < a href = "https://json-schema.org/" > json-schema< / a > as well as schema information readable by various libraries.< / p >
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< p > You can also write your own adapter to work with your specific frontend.
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If you wish to do so, it also provides an exporter that can export those schema information to json files.< / p >
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