Merge pull request #1800 from tomchristie/version-3.0

Version 3.0

Author: tomchristie

CONTRIBUTING.md

@@ -75,7 +75,7 @@ You can also use the excellent [`tox`][tox] testing tool to run the tests agains
 
 It's a good idea to make pull requests early on.  A pull request represents the start of a discussion, and doesn't necessarily need to be the final, finished submission.
 
-It's also always best to make a new branch before starting work on a pull request.  This means that you'll be able to later switch back to working on another seperate issue without interfering with an ongoing pull requests.
+It's also always best to make a new branch before starting work on a pull request.  This means that you'll be able to later switch back to working on another separate issue without interfering with an ongoing pull requests.
 
 It's also useful to remember that if you have an outstanding pull request then pushing new commits to your GitHub repo will also automatically update the pull requests.
 

README.md

@@ -27,7 +27,7 @@ There is a live example API for testing purposes, [available here][sandbox].
 # Requirements
 
 * Python (2.6.5+, 2.7, 3.2, 3.3, 3.4)
-* Django (1.4.2+, 1.5, 1.6, 1.7)
+* Django (1.4.11+, 1.5.5+, 1.6, 1.7)
 
 # Installation
 

docs/api-guide/fields.md

@@ -274,7 +274,27 @@ Corresponds to `django.db.models.fields.FloatField`.
 
 ## DecimalField
 
-A decimal representation.
+A decimal representation, represented in Python by a Decimal instance.
+
+Has two required arguments:
+
+- `max_digits` The maximum number of digits allowed in the number. Note that this number must be greater than or equal to decimal_places.
+
+- `decimal_places` The number of decimal places to store with the number.
+
+For example, to validate numbers up to 999 with a resolution of 2 decimal places, you would use:
+
+    serializers.DecimalField(max_digits=5, decimal_places=2)
+
+And to validate numbers up to anything less than one billion with a resolution of 10 decimal places:
+
+    serializers.DecimalField(max_digits=19, decimal_places=10)
+
+This field also takes an optional argument, `coerce_to_string`. If set to `True` the representation will be output as a string. If set to `False` the representation will be left as a `Decimal` instance and the final representation will be determined by the renderer.
+
+If unset, this will default to the same value as the `COERCE_DECIMAL_TO_STRING` setting, which is `True` unless set otherwise.
+
+**Signature:** `DecimalField(max_digits, decimal_places, coerce_to_string=None)`
 
 Corresponds to `django.db.models.fields.DecimalField`.
 

docs/api-guide/generic-views.md

@@ -19,8 +19,8 @@ Typically when using the generic views, you'll override the view, and set severa
 
     from django.contrib.auth.models import User
     from myapp.serializers import UserSerializer
-	from rest_framework import generics
-	from rest_framework.permissions import IsAdminUser
+    from rest_framework import generics
+    from rest_framework.permissions import IsAdminUser
 
     class UserList(generics.ListCreateAPIView):
         queryset = User.objects.all()
@@ -212,8 +212,6 @@ Provides a `.list(request, *args, **kwargs)` method, that implements listing a q
 
 If the queryset is populated, this returns a `200 OK` response, with a serialized representation of the queryset as the body of the response.  The response data may optionally be paginated.
 
-If the queryset is empty this returns a `200 OK` response, unless the `.allow_empty` attribute on the view is set to `False`, in which case it will return a `404 Not Found`.
-
 ## CreateModelMixin
 
 Provides a `.create(request, *args, **kwargs)` method, that implements creating and saving a new model instance.
@@ -370,6 +368,20 @@ If you are using a mixin across multiple views, you can take this a step further
 
 Using custom base classes is a good option if you have custom behavior that consistently needs to be repeated across a large number of views throughout your project.
 
+---
+
+# PUT as create
+
+Prior to version 3.0 the REST framework mixins treated `PUT` as either an update or a create operation, depending on if the object already existed or not.
+
+Allowing `PUT` as create operations is problematic, as it necessarily exposes information about the existence or non-existance of objects. It's also not obvious that transparently allowing re-creating of previously deleted instances is necessarily a better default behavior than simply returning `404` responses.
+
+Both styles "`PUT` as 404" and "`PUT` as create" can be valid in different circumstances, but from version 3.0 onwards we now use 404 behavior as the default, due to it being simpler and more obvious.
+
+If you need to generic PUT-as-create behavior you may want to include something like [this `AllowPUTAsCreateMixin` class](https://gist.github.com/tomchristie/a2ace4577eff2c603b1b) as a mixin to your views.
+
+---
+
 # Third party packages
 
 The following third party packages provide additional generic view implementations.

docs/api-guide/metadata.md

@@ -0,0 +1,103 @@
+<a class="github" href="metadata.py"></a>
+
+# Metadata
+
+> [The `OPTIONS`] 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.
+>
+> &mdash; [RFC7231, Section 4.3.7.][cite]
+
+REST framework includes a configurable mechanism for determining how your API should respond to `OPTIONS` requests. This allows you to return API schema or other resource information.
+
+There are not currently any widely adopted conventions for exactly what style of response should be returned for HTTP `OPTIONS` requests, so we provide an ad-hoc style that returns some useful information.
+
+Here's an example response that demonstrates the information that is returned by default.
+
+    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
+                }
+            }
+        }
+    }
+
+## Setting the metadata scheme
+
+You can set the metadata class globally using the `'DEFAULT_METADATA_CLASS'` settings key:
+
+    REST_FRAMEWORK = {
+        'DEFAULT_METADATA_CLASS': 'rest_framework.metadata.SimpleMetadata'
+    }
+
+Or you can set the metadata class individually for a view:
+
+    class APIRoot(APIView):
+        metadata_class = APIRootMetadata
+        
+        def get(self, request, format=None):
+            return Response({
+                ...
+            })
+
+The REST framework package only includes a single metadata class implementation, named `SimpleMetadata`. If you want to use an alternative style you'll need to implement a custom metadata class.
+
+## Creating schema endpoints
+
+If you have specific requirements for creating schema endpoints that are accessed with regular `GET` requests, you might consider re-using the metadata API for doing so.
+
+For example, the following additional route could be used on a viewset to provide a linkable schema endpoint.
+
+    @list_route(methods=['GET'])
+    def schema(self, request):
+        meta = self.metadata_class()
+        data = meta.determine_metadata(request, self)
+        return Response(data)
+
+There are a couple of reasons that you might choose to take this approach, including that `OPTIONS` responses [are not cacheable][no-options].
+
+---
+
+# Custom metadata classes
+
+If you want to provide a custom metadata class you should override `BaseMetadata` and implement the `determine_metadata(self, request, view)` method.
+
+Useful things that you might want to do could include returning schema information, using a format such as [JSON schema][json-schema], or returning debug information to admin users.
+
+## Example
+
+The following class could be used to limit the information that is returned to `OPTIONS` requests.
+
+    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()
+            }
+
+[cite]: http://tools.ietf.org/html/rfc7231#section-4.3.7
+[no-options]: https://www.mnot.net/blog/2012/10/29/NO_OPTIONS
+[json-schema]: http://json-schema.org/

docs/api-guide/renderers.md

@@ -74,37 +74,18 @@ If your API includes views that can serve both regular webpages and API response
 
 Renders the request data into `JSON`, using utf-8 encoding.
 
-Note that non-ascii characters will be rendered using JSON's `\uXXXX` character escape.  For example:
+Note that the default style is to include unicode characters, and render the response using a compact style with no unnecessary whitespace:
 
-    {"unicode black star": "\u2605"}
+    {"unicode black star":"★","value":999}
 
 The client may additionally include an `'indent'` media type parameter, in which case the returned `JSON` will be indented.  For example `Accept: application/json; indent=4`.
 
     {
-        "unicode black star": "\u2605"
+        "unicode black star": "★",
+        "value": 999
     }
 
-**.media_type**: `application/json`
-
-**.format**: `'.json'`
-
-**.charset**: `None`
-
-## UnicodeJSONRenderer
-
-Renders the request data into `JSON`, using utf-8 encoding.
-
-Note that non-ascii characters will not be character escaped.  For example:
-
-    {"unicode black star": "★"}
-
-The client may additionally include an `'indent'` media type parameter, in which case the returned `JSON` will be indented.  For example `Accept: application/json; indent=4`.
-
-    {
-        "unicode black star": "★"
-    }
-
-Both the `JSONRenderer` and `UnicodeJSONRenderer` styles conform to [RFC 4627][rfc4627], and are syntactically valid JSON.
+The default JSON encoding style can be altered using the `UNICODE_JSON` and `COMPACT_JSON` settings keys.
 
 **.media_type**: `application/json`
 

docs/api-guide/settings.md

@@ -265,7 +265,7 @@ A format string that should be used by default for rendering the output of `Date
 
 May be any of `None`, `'iso-8601'` or a Python [strftime format][strftime] string.
 
-Default: `None`
+Default: `'iso-8601'`
 
 #### DATETIME_INPUT_FORMATS
 
@@ -281,7 +281,7 @@ A format string that should be used by default for rendering the output of `Date
 
 May be any of `None`, `'iso-8601'` or a Python [strftime format][strftime] string.
 
-Default: `None`
+Default: `'iso-8601'`
 
 #### DATE_INPUT_FORMATS
 
@@ -297,7 +297,7 @@ A format string that should be used by default for rendering the output of `Time
 
 May be any of `None`, `'iso-8601'` or a Python [strftime format][strftime] string.
 
-Default: `None`
+Default: `'iso-8601'`
 
 #### TIME_INPUT_FORMATS
 
@@ -309,6 +309,46 @@ Default: `['iso-8601']`
 
 ---
 
+## Encodings
+
+#### UNICODE_JSON
+
+When set to `True`, JSON responses will allow unicode characters in responses. For example:
+
+    {"unicode black star":"★"}
+
+When set to `False`, JSON responses will escape non-ascii characters, like so:
+
+    {"unicode black star":"\u2605"}
+
+Both styles conform to [RFC 4627][rfc4627], and are syntactically valid JSON. The unicode style is prefered as being more user-friendly when inspecting API responses.
+
+Default: `True`
+
+#### COMPACT_JSON
+
+When set to `True`, JSON responses will return compact representations, with no spacing after `':'` and `','` characters. For example:
+
+    {"is_admin":false,"email":"jane@example"}
+
+When set to `False`, JSON responses will return slightly more verbose representations, like so:
+
+    {"is_admin": false, "email": "jane@example"}
+
+The default style is to return minified responses, in line with [Heroku's API design guidelines][heroku-minified-json].
+
+Default: `True`
+
+#### COERCE_DECIMAL_TO_STRING
+
+When returning decimal objects in API representations that do not support a native decimal type, it is normally best to return the value as a string. This avoids the loss of precision that occurs with binary floating point implementations.
+
+When set to `True`, the serializer `DecimalField` class will return strings instead of `Decimal` objects. When set to `False`, serializers will return `Decimal` objects, which the default JSON encoder will return as floats.
+
+Default: `True`
+
+---
+
 ## View names and descriptions
 
 **The following settings are used to generate the view names and descriptions, as used in responses to `OPTIONS` requests, and as used in the browsable API.**
@@ -378,4 +418,6 @@ An integer of 0 or more, that may be used to specify the number of application p
 Default: `None`
 
 [cite]: http://www.python.org/dev/peps/pep-0020/
+[rfc4627]: http://www.ietf.org/rfc/rfc4627.txt
+[heroku-minified-json]: https://github.com/interagent/http-api-design#keep-json-minified-in-all-responses
 [strftime]: http://docs.python.org/2/library/time.html#time.strftime

docs/api-guide/throttling.md

@@ -178,6 +178,8 @@ To create a custom throttle, override `BaseThrottle` and implement `.allow_reque
 
 Optionally you may also override the `.wait()` method.  If implemented, `.wait()` should return a recommended number of seconds to wait before attempting the next request, or `None`.  The `.wait()` method will only be called if `.allow_request()` has previously returned `False`.
 
+If the `.wait()` method is implemented and the request is throttled, then a `Retry-After` header will be included in the response.
+
 ## Example
 
 The following is an example of a rate throttle, that will randomly throttle 1 in every 10 requests.