diff options
Diffstat (limited to 'rest_framework/renderers.py')
| -rw-r--r-- | rest_framework/renderers.py | 148 |
1 files changed, 104 insertions, 44 deletions
diff --git a/rest_framework/renderers.py b/rest_framework/renderers.py index e5e4134b..8dff0c77 100644 --- a/rest_framework/renderers.py +++ b/rest_framework/renderers.py @@ -1,12 +1,15 @@ """ -Renderers are used to serialize a View's output into specific media types. +Renderers are used to serialize a response into specific media types. -Django REST framework also provides HTML and PlainText renderers that help self-document the API, -by serializing the output along with documentation regarding the View, output status and headers, -and providing forms and links depending on the allowed methods, renderers and parsers on the View. +They give us a generic way of being able to handle various media types +on the response, such as JSON encoded data or HTML output. + +REST framework also provides an HTML renderer the renders the browseable API. """ +import copy import string from django import forms +from django.http.multipartparser import parse_header from django.template import RequestContext, loader from django.utils import simplejson as json from rest_framework.compat import yaml @@ -16,15 +19,14 @@ from rest_framework.request import clone_request from rest_framework.utils import dict2xml from rest_framework.utils import encoders from rest_framework.utils.breadcrumbs import get_breadcrumbs -from rest_framework.utils.mediatypes import get_media_type_params from rest_framework import VERSION from rest_framework import serializers, parsers class BaseRenderer(object): """ - All renderers must extend this class, set the :attr:`media_type` attribute, - and override the :meth:`render` method. + All renderers should extend this class, setting the `media_type` + and `format` attributes, and override the `.render()` method. """ media_type = None @@ -58,7 +60,7 @@ class JSONRenderer(BaseRenderer): if accepted_media_type: # If the media type looks like 'application/json; indent=4', # then pretty print the result. - params = get_media_type_params(accepted_media_type) + base_media_type, params = parse_header(accepted_media_type) indent = params.get('indent', indent) try: indent = max(min(int(indent), 8), 0) @@ -137,13 +139,24 @@ class YAMLRenderer(BaseRenderer): return yaml.dump(data, stream=None, Dumper=self.encoder) -class HTMLRenderer(BaseRenderer): +class TemplateHTMLRenderer(BaseRenderer): """ - A Base class provided for convenience. + An HTML renderer for use with templates. + + The data supplied to the Response object should be a dictionary that will + be used as context for the template. + + The template name is determined by (in order of preference): + + 1. An explicit `.template_name` attribute set on the response. + 2. An explicit `.template_name` attribute set on this class. + 3. The return result of calling `view.get_template_names()`. - Render the object simply by using the given template. - To create a template renderer, subclass this class, and set - the :attr:`media_type` and :attr:`template` attributes. + For example: + data = {'users': User.objects.all()} + return Response(data, template_name='users.html') + + For pre-rendered HTML, see StaticHTMLRenderer. """ media_type = 'text/html' @@ -186,6 +199,26 @@ class HTMLRenderer(BaseRenderer): raise ConfigurationError('Returned a template response with no template_name') +class StaticHTMLRenderer(BaseRenderer): + """ + An HTML renderer class that simply returns pre-rendered HTML. + + The data supplied to the Response object should be a string representing + the pre-rendered HTML content. + + For example: + data = '<html><body>example</body></html>' + return Response(data) + + For template rendered HTML, see TemplateHTMLRenderer. + """ + media_type = 'text/html' + format = 'html' + + def render(self, data, accepted_media_type=None, renderer_context=None): + return data + + class BrowsableAPIRenderer(BaseRenderer): """ HTML renderer used to self-document the API. @@ -222,11 +255,9 @@ class BrowsableAPIRenderer(BaseRenderer): return content - def get_form(self, view, method, request): + def show_form_for_method(self, view, method, request, obj): """ - Get a form, possibly bound to either the input or output data. - In the absence on of the Resource having an associated form then - provide a form that can be used to submit arbitrary content. + Returns True if a form should be shown for this method. """ if not method in view.allowed_methods: return # Not a valid method @@ -235,22 +266,14 @@ class BrowsableAPIRenderer(BaseRenderer): return # Cannot use form overloading request = clone_request(request, method) - if not view.has_permission(request): - return # Don't have permission - - if method == 'DELETE' or method == 'OPTIONS': - return True # Don't actually need to return a form - - if (not getattr(view, 'get_serializer', None) or - not parsers.FormParser in getattr(view, 'parser_classes')): - media_types = [parser.media_type for parser in view.parser_classes] - return self.get_generic_content_form(media_types) - - ##### - # TODO: This is a little bit of a hack. Actually we'd like to remove - # this and just render serializer fields to html directly. + try: + if not view.has_permission(request, obj): + return # Don't have permission + except: + return # Don't have permission and exception explicitly raise + return True - # We need to map our Fields to Django's Fields. + def serializer_to_form_fields(self, serializer): field_mapping = { serializers.FloatField: forms.FloatField, serializers.IntegerField: forms.IntegerField, @@ -260,32 +283,69 @@ class BrowsableAPIRenderer(BaseRenderer): serializers.CharField: forms.CharField, serializers.BooleanField: forms.BooleanField, serializers.PrimaryKeyRelatedField: forms.ModelChoiceField, - serializers.ManyPrimaryKeyRelatedField: forms.ModelMultipleChoiceField + serializers.ManyPrimaryKeyRelatedField: forms.ModelMultipleChoiceField, + serializers.HyperlinkedRelatedField: forms.ModelChoiceField, + serializers.ManyHyperlinkedRelatedField: forms.ModelMultipleChoiceField } - # Creating an on the fly form see: http://stackoverflow.com/questions/3915024/dynamically-creating-classes-python fields = {} - obj, data = None, None - if getattr(view, 'object', None): - obj = view.object - - serializer = view.get_serializer(instance=obj) for k, v in serializer.get_fields(True).items(): - if getattr(v, 'readonly', True): + if getattr(v, 'read_only', True): continue kwargs = {} + kwargs['required'] = v.required + if getattr(v, 'queryset', None): - kwargs['queryset'] = getattr(v, 'queryset', None) + kwargs['queryset'] = v.queryset + + if getattr(v, 'widget', None): + widget = copy.deepcopy(v.widget) + # If choices have friendly readable names, + # then add in the identities too + if getattr(widget, 'choices', None): + choices = widget.choices + if any([ident != desc for (ident, desc) in choices]): + choices = [(ident, "%s (%s)" % (desc, ident)) + for (ident, desc) in choices] + widget.choices = choices + kwargs['widget'] = widget + + if getattr(v, 'default', None) is not None: + kwargs['initial'] = v.default + + kwargs['label'] = k try: fields[k] = field_mapping[v.__class__](**kwargs) except KeyError: - fields[k] = forms.CharField() + fields[k] = forms.CharField(**kwargs) + return fields + + def get_form(self, view, method, request): + """ + Get a form, possibly bound to either the input or output data. + In the absence on of the Resource having an associated form then + provide a form that can be used to submit arbitrary content. + """ + obj = getattr(view, 'object', None) + if not self.show_form_for_method(view, method, request, obj): + return + + if method == 'DELETE' or method == 'OPTIONS': + return True # Don't actually need to return a form + + if not getattr(view, 'get_serializer', None) or not parsers.FormParser in view.parser_classes: + media_types = [parser.media_type for parser in view.parser_classes] + return self.get_generic_content_form(media_types) + + serializer = view.get_serializer(instance=obj) + fields = self.serializer_to_form_fields(serializer) + # Creating an on the fly form see: + # http://stackoverflow.com/questions/3915024/dynamically-creating-classes-python OnTheFlyForm = type("OnTheFlyForm", (forms.Form,), fields) - if obj and not view.request.method == 'DELETE': # Don't fill in the form when the object is deleted - data = serializer.data + data = (obj is not None) and serializer.data or None form_instance = OnTheFlyForm(data) return form_instance |