Lots of good form validation and default actions

src/rest/emitters.py

@@ -4,12 +4,13 @@ import json
 from utils import dict2xml
 
 class BaseEmitter(object):
-    def __init__(self, resource, request, status, headers):
+    def __init__(self, resource, request, status, headers, form):
         self.request = request
         self.resource = resource
         self.status = status
         self.headers = headers
-    
+        self.form = form
+
     def emit(self, output):
         return output
 
@@ -26,14 +27,13 @@ class TemplatedEmitter(BaseEmitter):
             'headers': self.headers,
             'resource_name': self.resource.__class__.__name__,
             'resource_doc': self.resource.__doc__,
-            'create_form': self.resource.create_form and self.resource.create_form() or None,
-            'update_form': self.resource.update_form and self.resource.update_form() or None,
-            'allowed_methods': self.resource.allowed_methods,
+            'create_form': self.form,
+            'update_form': self.form,
             'request': self.request,
             'resource': self.resource,
         })
         return template.render(context)
-    
+
 class JSONEmitter(BaseEmitter):
     def emit(self, output):
         return json.dumps(output)

src/rest/parsers.py

@@ -17,6 +17,44 @@ class XMLParser(BaseParser):
     pass
 
 class FormParser(BaseParser):
+    """The default parser for form data.
+    Return a dict containing a single value for each non-reserved parameter
+    """
+    def __init__(self, resource, request):
+
+        if request.method == 'PUT':
+            # Fix from piston to force Django to give PUT requests the same
+            # form processing that POST requests get...
+            #
+            # Bug fix: if _load_post_and_files has already been called, for
+            # example by middleware accessing request.POST, the below code to
+            # pretend the request is a POST instead of a PUT will be too late
+            # to make a difference. Also calling _load_post_and_files will result 
+            # in the following exception:
+            #   AttributeError: You cannot set the upload handlers after the upload has been processed.
+            # The fix is to check for the presence of the _post field which is set 
+            # the first time _load_post_and_files is called (both by wsgi.py and 
+            # modpython.py). If it's set, the request has to be 'reset' to redo
+            # the query value parsing in POST mode.
+            if hasattr(request, '_post'):
+                del request._post
+                del request._files
+            
+            try:
+                request.method = "POST"
+                request._load_post_and_files()
+                request.method = "PUT"
+            except AttributeError:
+                request.META['REQUEST_METHOD'] = 'POST'
+                request._load_post_and_files()
+                request.META['REQUEST_METHOD'] = 'PUT'
+
+        # 
+        self.data = {}
+        for (key, val) in request.POST.items():
+            if key not in resource.RESERVED_PARAMS:
+                self.data[key] = val
+
     def parse(self, input):
-        return self.request.POST
+        return self.data
 

src/rest/resource.py

 from django.http import HttpResponse
 from django.core.urlresolvers import reverse
-from rest import emitters, parsers, utils
+from rest import emitters, parsers
 from decimal import Decimal
 
 # 
@@ -20,44 +20,103 @@ class ResourceException(Exception):
 
 
 class Resource(object):
+    # List of RESTful operations which may be performed on this resource.
+    allowed_operations = ('read',)
 
-    allowed_methods = ('GET',)
-
-    callmap = { 'GET': 'read', 'POST': 'create', 
-                'PUT': 'update', 'DELETE': 'delete' }
-
-    emitters = [ ('application/json', emitters.JSONEmitter),
+    # List of content-types the resource can respond with, ordered by preference
+    emitters = ( ('application/json', emitters.JSONEmitter),
                  ('text/html', emitters.HTMLEmitter),
                  ('application/xhtml+xml', emitters.HTMLEmitter),
                  ('text/plain', emitters.TextEmitter),
-                 ('application/xml', emitters.XMLEmitter), ]
+                 ('application/xml', emitters.XMLEmitter), )
 
+    # List of content-types the resource can read from
     parsers = { 'application/json': parsers.JSONParser,
                 'application/xml': parsers.XMLParser,
                 'application/x-www-form-urlencoded': parsers.FormParser,
                 'multipart/form-data': parsers.FormParser }
 
-    create_form = None
-    update_form = None
+    # Optional form for input validation and presentation of HTML formatted responses. 
+    form = None
+
+    # Map standard HTTP methods to RESTful operations
+    CALLMAP = { 'GET': 'read', 'POST': 'create', 
+                'PUT': 'update', 'DELETE': 'delete' }
+    REVERSE_CALLMAP = dict([(val, key) for (key, val) in CALLMAP.items()])
 
+    # Some reserved parameters to allow us to use standard HTML forms with our resource.
     METHOD_PARAM = '_method'
     ACCEPT_PARAM = '_accept'
+    CSRF_PARAM = 'csrfmiddlewaretoken'
+    RESERVED_PARAMS = set((METHOD_PARAM, ACCEPT_PARAM, CSRF_PARAM))
+
+    USE_SITEMAP_FOR_ABSOLUTE_URLS = False
 
 
     def __new__(cls, request, *args, **kwargs):
+        """Make the class callable so it can be used as a Django view."""
         self = object.__new__(cls)
         self.__init__()
         self._request = request
-        return self._handle_request(request, *args, **kwargs)
+        try:
+            return self._handle_request(request, *args, **kwargs)
+        except:
+            import traceback
+            traceback.print_exc()
+            raise
+        
 
 
     def __init__(self):
         pass
 
 
-    def _determine_method(self, request):
-        """Determine the HTTP method that this request should be treated as,
-        allowing for PUT and DELETE tunneling via the _method parameter."""
+    def reverse(self, view, *args, **kwargs):
+        """Return a fully qualified URI for a given view or resource, using the current request as the base URI.
+        TODO: Add SITEMAP option.
+        
+        Provided for convienience."""
+        return self._request.build_absolute_uri(reverse(view, *args, **kwargs))
+
+
+    def make_absolute(self, uri):
+        """Given a relative URI, return an absolute URI using the current request as the base URI.
+        TODO: Add SITEMAP option.
+
+        Provided for convienience."""
+        return self._request.build_absolute_uri(uri)
+
+
+    def read(self, headers={}, *args, **kwargs):
+        """RESTful read on the resource, which must be subclassed to be implemented.  Should be a safe operation."""
+        self.not_implemented('read')
+
+
+    def create(self, data=None, headers={}, *args, **kwargs):
+        """RESTful create on the resource, which must be subclassed to be implemented."""
+        self.not_implemented('create')
+
+
+    def update(self, data=None, headers={}, *args, **kwargs):
+        """RESTful update on the resource, which must be subclassed to be implemented.  Should be an idempotent operation."""
+        self.not_implemented('update')
+
+
+    def delete(self, headers={}, *args, **kwargs):
+        """RESTful delete on the resource, which must be subclassed to be implemented.  Should be an idempotent operation."""
+        self.not_implemented('delete')
+
+
+    def not_implemented(self, operation):
+        """Return an HTTP 500 server error if an operation is called which has been allowed by
+        allowed_operations, but which has not been implemented."""
+        raise ResourceException(STATUS_500_INTERNAL_SERVER_ERROR,
+                                {'detail': '%s operation on this resource has not been implemented' % (operation, )})
+
+
+    def determine_method(self, request):
+        """Determine the HTTP method that this request should be treated as.
+        Allow for PUT and DELETE tunneling via the _method parameter."""
         method = request.method
         
         if method == 'POST' and request.POST.has_key(self.METHOD_PARAM):
@@ -66,17 +125,47 @@ class Resource(object):
         return method
 
 
-    def _check_method_allowed(self, method):
-        if not method in self.allowed_methods:
+    def check_method_allowed(self, method):
+        """Ensure the request method is acceptable fot this resource."""
+        if not method in self.CALLMAP.keys():
+            raise ResourceException(STATUS_501_NOT_IMPLEMENTED,
+                                    {'detail': 'Unknown or unsupported method \'%s\'' % method})
+            
+        if not self.CALLMAP[method] in self.allowed_operations:
             raise ResourceException(STATUS_405_METHOD_NOT_ALLOWED,
                                     {'detail': 'Method \'%s\' not allowed on this resource.' % method})
+
+
+
+    def determine_form(self, data=None):
+        """Optionally return a Django Form instance, which may be used for validation
+        and/or rendered by an HTML/XHTML emitter.
         
-        if not method in self.callmap.keys():
-            raise ResourceException(STATUS_501_NOT_IMPLEMENTED,
-                                    {'detail': 'Unknown or unsupported method \'%s\'' % method})
+        The data argument will be non Null if the form is required to be bound to some deserialized
+        input data, or Null if the form is required to be unbound. 
+        """
+        if self.form:
+            return self.form(data)
+        return None
+  
+  
+    def cleanup_request(self, data, form=None):
+        """Perform any resource-specific data deserialization and/or validation
+        after the initial HTTP content-type deserialization has taken place.
+        
+        Optionally this may use a Django Form which will have been bound to the data,
+        rather than using the data directly.
+        """
+        return data
+
+
+    def cleanup_response(self, data):
+        """Perform any resource-specific data filtering prior to the standard HTTP
+        content-type serialization."""
+        return data
 
 
-    def _determine_parser(self, request):
+    def determine_parser(self, request):
         """Return the appropriate parser for the input, given the client's 'Content-Type' header,
         and the content types that this Resource knows how to parse."""
         content_type = request.META.get('CONTENT_TYPE', 'application/x-www-form-urlencoded')
@@ -90,14 +179,13 @@ class Resource(object):
         except KeyError:
             raise ResourceException(STATUS_415_UNSUPPORTED_MEDIA_TYPE,
                                     {'detail': 'Unsupported content type \'%s\'' % content_type})
-    
-    def _determine_emitter(self, request):
+
+
+    def determine_emitter(self, request):
         """Return the appropriate emitter for the output, given the client's 'Accept' header,
         and the content types that this Resource knows how to serve.
         
-        See: RFC 2616, Section 14 - http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
-        """
-
+        See: RFC 2616, Section 14 - http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html"""
         default = self.emitters[0]
 
         if not request.META.has_key('HTTP_ACCEPT'):
@@ -141,61 +229,61 @@ class Resource(object):
                                 {'detail': 'Could not statisfy the client\'s accepted content type',
                                  'accepted_types': [item[0] for item in self.emitters]})
 
-    
-    def _validate_data(self, method, data):
-        """If there is an appropriate form to deal with this operation,
-        then validate the data and return the resulting dictionary.
-        """
-        if method == 'PUT' and self.update_form:
-            form = self.update_form(data)
-        elif method == 'POST' and self.create_form:
-            form = self.create_form(data)
-        else:
-            return data
-
-        if not form.is_valid():
-            raise ResourceException(STATUS_400_BAD_REQUEST,
-                                    {'detail': dict((k, map(unicode, v))
-                                                    for (k,v) in form.errors.iteritems())})
-
-        return form.cleaned_data
-
 
     def _handle_request(self, request, *args, **kwargs):
+        """
+        
+        Broadly this consists of the following procedure:
+
+        0. ensure the operation is permitted
+        1. deserialize request content into request data, using standard HTTP content types (PUT/POST only)
+        2. cleanup and validate request data (PUT/POST only)
+        3. call the core method to get the response data
+        4. cleanup the response data
+        5. serialize response data into response content, using standard HTTP content negotiation
+        """
+        method = self.determine_method(request)
+        emitter = None
+        form = None
+        try:
+            # Before we attempt anything else determine what format to emit our response data with.
+            mimetype, emitter = self.determine_emitter(request)
 
-        # Hack to ensure PUT requests get the same form treatment as POST requests
-        utils.coerce_put_post(request)
-
-        # Get the request method, allowing for PUT and DELETE tunneling
-        method = self._determine_method(request)
+            # Ensure the requested operation is permitted on this resource
+            self.check_method_allowed(method)
 
-        try:
-            self._check_method_allowed(method)
-    
-            # Parse the HTTP Request content
-            func = getattr(self, self.callmap.get(method, ''))
+            # Get the appropriate create/read/update/delete function
+            func = getattr(self, self.CALLMAP.get(method, ''))
     
+            # Either generate the response data, deserializing and validating any request data
             if method in ('PUT', 'POST'):
-                parser = self._determine_parser(request)
+                parser = self.determine_parser(request)
                 data = parser(self, request).parse(request.raw_post_data)
-                data = self._validate_data(method, data)
+                form = self.determine_form(data)
+                data = self.cleanup_request(data, form)
                 (status, ret, headers) = func(data, request.META, *args, **kwargs)
 
             else:
                 (status, ret, headers) = func(request.META, *args, **kwargs)
-        except ResourceException, exc:
-            (status, ret, headers) = (exc.status, exc.content, exc.headers)
 
-        headers['Allow'] = ', '.join(self.allowed_methods)
-        
-        # Serialize the HTTP Response content
-        try:        
-            mimetype, emitter = self._determine_emitter(request)
+
         except ResourceException, exc:
             (status, ret, headers) = (exc.status, exc.content, exc.headers)
+
+        # Use a default emitter if request failed without being able to determine an acceptable emitter 
+        if emitter is None:
             mimetype, emitter = self.emitters[0]
+        
+        # Use a form unbound to any data if one has not yet been created
+        if form is None:
+            form = self.determine_form()
+        
+        # Always add the allow header
+        headers['Allow'] = ', '.join([self.REVERSE_CALLMAP[operation] for operation in self.allowed_operations])
             
-        content = emitter(self, request, status, headers).emit(ret)
+        # Serialize the response content
+        ret = self.cleanup_response(ret)
+        content = emitter(self, request, status, headers, form).emit(ret)
 
         # Build the HTTP Response
         resp = HttpResponse(content, mimetype=mimetype, status=status)
@@ -204,24 +292,293 @@ class Resource(object):
 
         return resp
 
-    def _not_implemented(self, operation):
-        resource_name = self.__class__.__name__
-        raise ResourceException(STATUS_500_INTERNAL_SERVER_ERROR,
-                                {'detail': '%s operation on this resource has not been implemented' % (operation, )})
 
-    def read(self, headers={}, *args, **kwargs):
-        self._not_implemented('read')
 
-    def create(self, data=None, headers={}, *args, **kwargs):
-        self._not_implemented('create')
+
+from django.forms import ModelForm
+from django.db.models.query import QuerySet
+from django.db.models import Model
+import decimal
+import inspect
+import re
+
+class ModelResource(Resource):
+    model = None
+    fields = None
+    form_fields = None
+
+    def determine_form(self, data=None):
+        """Return a form that may be used in validation and/or rendering an html emitter"""
+        if self.form:
+            return self.form
+
+        elif self.model:
+            class NewModelForm(ModelForm):
+                class Meta:
+                    model = self.model
+                    fields = self.form_fields if self.form_fields else self.fields
+                    
+            if data is None:
+                return NewModelForm()
+            else:
+                return NewModelForm(data)
+        
+        else:
+            return None
     
-    def update(self, data=None, headers={}, *args, **kwargs):
-        self._not_implemented('update')
+    def cleanup_request(self, data, form=None):
+        """Filter data into form-cleaned data, performing validation and type coercion."""
+        if form is None:
+            return data
 
-    def delete(self, headers={}, *args, **kwargs):
-        self._not_implemented('delete')
+        if not form.is_valid():
+            details = dict((key, map(unicode, val)) for (key, val) in form.errors.iteritems())
+            raise ResourceException(STATUS_400_BAD_REQUEST, {'detail': details})
 
-    def reverse(self, view, *args, **kwargs):
-        """Return a fully qualified URI for a view, using the current request as the base URI.
+        return form.cleaned_data       
+
+    def cleanup_response(self, data):
         """
-        return self._request.build_absolute_uri(reverse(view, *args, **kwargs))
+        Recursively serialize a lot of types, and
+        in cases where it doesn't recognize the type,
+        it will fall back to Django's `smart_unicode`.
+        
+        Returns `dict`.
+        """
+
+        def _any(thing, fields=()):
+            """
+            Dispatch, all types are routed through here.
+            """
+            ret = None
+            
+            if isinstance(thing, QuerySet):
+                ret = _qs(thing, fields=fields)
+            elif isinstance(thing, (tuple, list)):
+                ret = _list(thing)
+            elif isinstance(thing, dict):
+                ret = _dict(thing)
+            elif isinstance(thing, decimal.Decimal):
+                ret = str(thing)
+            elif isinstance(thing, Model):
+                ret = _model(thing, fields=fields)
+            #elif isinstance(thing, HttpResponse):    TRC
+            #    raise HttpStatusCode(thing)
+            elif inspect.isfunction(thing):
+                if not inspect.getargspec(thing)[0]:
+                    ret = _any(thing())
+            elif hasattr(thing, '__emittable__'):
+                f = thing.__emittable__
+                if inspect.ismethod(f) and len(inspect.getargspec(f)[0]) == 1:
+                    ret = _any(f())
+            else:
+                ret = str(thing)  # TRC  TODO: Change this back!
+
+            return ret
+
+        def _fk(data, field):
+            """
+            Foreign keys.
+            """
+            return _any(getattr(data, field.name))
+        
+        def _related(data, fields=()):
+            """
+            Foreign keys.
+            """
+            return [ _model(m, fields) for m in data.iterator() ]
+        
+        def _m2m(data, field, fields=()):
+            """
+            Many to many (re-route to `_model`.)
+            """
+            return [ _model(m, fields) for m in getattr(data, field.name).iterator() ]
+        
+
+        def _method_fields(data, fields):
+            if not data:
+                return { }
+    
+            has = dir(data)
+            ret = dict()
+                
+            for field in fields:
+                if field in has:
+                    ret[field] = getattr(data, field)
+            
+            return ret
+
+        def _model(data, fields=()):
+            """
+            Models. Will respect the `fields` and/or
+            `exclude` on the handler (see `typemapper`.)
+            """
+            ret = { }
+            #handler = self.in_typemapper(type(data), self.anonymous)  # TRC
+            handler = None                                             # TRC
+            get_absolute_uri = False
+            
+            if handler or fields:
+                v = lambda f: getattr(data, f.attname)
+
+                if not fields:
+                    """
+                    Fields was not specified, try to find teh correct
+                    version in the typemapper we were sent.
+                    """
+                    mapped = self.in_typemapper(type(data), self.anonymous)
+                    get_fields = set(mapped.fields)
+                    exclude_fields = set(mapped.exclude).difference(get_fields)
+                
+                    if not get_fields:
+                        get_fields = set([ f.attname.replace("_id", "", 1)
+                            for f in data._meta.fields ])
+                
+                    # sets can be negated.
+                    for exclude in exclude_fields:
+                        if isinstance(exclude, basestring):
+                            get_fields.discard(exclude)
+                            
+                        elif isinstance(exclude, re._pattern_type):
+                            for field in get_fields.copy():
+                                if exclude.match(field):
+                                    get_fields.discard(field)
+                                    
+                else:
+                    get_fields = set(fields)
+
+                if 'absolute_uri' in get_fields:   # MOVED (TRC)
+                    get_absolute_uri = True
+
+                met_fields = _method_fields(handler, get_fields)  # TRC
+
+                for f in data._meta.local_fields:
+                    if f.serialize and not any([ p in met_fields for p in [ f.attname, f.name ]]):
+                        if not f.rel:
+                            if f.attname in get_fields:
+                                ret[f.attname] = _any(v(f))
+                                get_fields.remove(f.attname)
+                        else:
+                            if f.attname[:-3] in get_fields:
+                                ret[f.name] = _fk(data, f)
+                                get_fields.remove(f.name)
+                
+                for mf in data._meta.many_to_many:
+                    if mf.serialize and mf.attname not in met_fields:
+                        if mf.attname in get_fields:
+                            ret[mf.name] = _m2m(data, mf)
+                            get_fields.remove(mf.name)
+                
+                # try to get the remainder of fields
+                for maybe_field in get_fields:
+                    
+                    if isinstance(maybe_field, (list, tuple)):
+                        model, fields = maybe_field
+                        inst = getattr(data, model, None)
+
+                        if inst:
+                            if hasattr(inst, 'all'):
+                                ret[model] = _related(inst, fields)
+                            elif callable(inst):
+                                if len(inspect.getargspec(inst)[0]) == 1:
+                                    ret[model] = _any(inst(), fields)
+                            else:
+                                ret[model] = _model(inst, fields)
+
+                    elif maybe_field in met_fields:
+                        # Overriding normal field which has a "resource method"
+                        # so you can alter the contents of certain fields without
+                        # using different names.
+                        ret[maybe_field] = _any(met_fields[maybe_field](data))
+
+                    else:                    
+                        maybe = getattr(data, maybe_field, None)
+                        if maybe:
+                            if callable(maybe):
+                                if len(inspect.getargspec(maybe)[0]) == 1:
+                                    ret[maybe_field] = _any(maybe())
+                            else:
+                                ret[maybe_field] = _any(maybe)
+                        else:
+                            pass   # TRC
+                            #handler_f = getattr(handler or self.handler, maybe_field, None)
+                            #
+                            #if handler_f:
+                            #    ret[maybe_field] = _any(handler_f(data))
+
+            else:
+                for f in data._meta.fields:
+                    ret[f.attname] = _any(getattr(data, f.attname))
+                
+                fields = dir(data.__class__) + ret.keys()
+                add_ons = [k for k in dir(data) if k not in fields]
+                
+                for k in add_ons:
+                    ret[k] = _any(getattr(data, k))
+            
+            # TRC
+            # resouce uri
+            #if self.in_typemapper(type(data), self.anonymous):
+            #    handler = self.in_typemapper(type(data), self.anonymous)
+            #    if hasattr(handler, 'resource_uri'):
+            #        url_id, fields = handler.resource_uri()
+            #        ret['resource_uri'] = permalink( lambda: (url_id, 
+            #            (getattr(data, f) for f in fields) ) )()
+            
+            # TRC
+            #if hasattr(data, 'get_api_url') and 'resource_uri' not in ret:
+            #    try: ret['resource_uri'] = data.get_api_url()
+            #    except: pass
+            
+            # absolute uri
+            if hasattr(data, 'get_absolute_url') and get_absolute_uri:
+                try: ret['absolute_uri'] = self.make_absolute(data.get_absolute_url())
+                except: pass
+
+            return ret
+        
+        def _qs(data, fields=()):
+            """
+            Querysets.
+            """
+            return [ _any(v, fields) for v in data ]
+                
+        def _list(data):
+            """
+            Lists.
+            """
+            return [ _any(v) for v in data ]
+            
+        def _dict(data):
+            """
+            Dictionaries.
+            """
+            return dict([ (k, _any(v)) for k, v in data.iteritems() ])
+            
+        # Kickstart the seralizin'.
+        return _any(data, self.fields)
+
+
+    def create(self, data, headers={}):
+        instance = self.model(**data)
+        instance.save()
+        headers = {}
+        if hasattr(instance, 'get_absolute_url'):
+            headers['Location'] = self.make_absolute(instance.get_absolute_url())
+        return (201, instance, headers)
+
+    def read(self, headers={}, *args, **kwargs):
+        instance = self.model.objects.get(**kwargs)
+        return (200, instance, {})
+
+    def update(self, data, headers={}, *args, **kwargs):
+        instance = self.model.objects.get(**kwargs)    
+        for (key, val) in data.items():
+            setattr(instance, key, val)
+        instance.save()
+        return (200, instance, {})
+
+    def delete(self, headers={}, *args, **kwargs):
+        instance = self.model.objects.get(**kwargs)
+        instance.delete()
+        return (204, '', {})
\ No newline at end of file

src/rest/templates/emitter.html

@@ -12,17 +12,17 @@
     <h1>{{ resource_name }}</h1>
     <p>{{ resource_doc }}</p>
     <pre>{% autoescape off %}<b>{{ status }} {{ reason }}</b>
-{% for key, val in headers.items %}<b>{{ key }}:</b> {{ val }}
+{% for key, val in headers.items %}<b>{{ key }}:</b> {{ val|urlize_quoted_links }}
 {% endfor %}
 {{ content|urlize_quoted_links }}{% endautoescape %}    </pre>
 
-{% if 'GET' in allowed_methods %}
+{% if 'read' in resource.allowed_operations %}
 	<div class='action'>
 		<a href='{{ request.path }}'>Read</a>
 	</div>
 {% endif %}
 
-{% if 'POST' in resource.allowed_methods %}
+{% if 'create' in resource.allowed_operations %}
 	<div class='action'>
 		<form action="{{ request.path }}" method="POST">
 		    {% csrf_token %}
@@ -32,7 +32,7 @@
 	</div>
 {% endif %}
 
-{% if 'PUT' in resource.allowed_methods %}
+{% if 'update' in resource.allowed_operations %}
 	<div class='action'>
 		<form action="{{ request.path }}" method="POST">
 			<input type="hidden" name="{{ resource.METHOD_PARAM}}" value="PUT" />
@@ -43,7 +43,7 @@
 	</div>
 {% endif %}
 
-{% if 'DELETE' in resource.allowed_methods %}
+{% if 'delete' in resource.allowed_operations %}
 	<div class='action'>
 		<form action="{{ request.path }}" method="POST">
 		    {% csrf_token %}

src/testapp/models.py

 from django.db import models
+import uuid
 
-# Create your models here.
+def uuid_str():
+    return str(uuid.uuid1())
+
+class ExampleModel(models.Model):
+    num = models.IntegerField(default=2, choices=((1,'one'), (2, 'two')))
+    hidden_num = models.IntegerField(verbose_name='Something', help_text='HELP')
+    text = models.TextField(blank=False)
+    another = models.CharField(max_length=10)
+
+
+class ExampleContainer(models.Model):
+    """Container.  Has a key, a name, and some internal data, and contains a set of items."""
+    key = models.CharField(primary_key=True, default=uuid_str, max_length=36, editable=False)
+    name = models.CharField(max_length=256)
+    internal = models.IntegerField(default=0)
+
+    @models.permalink
+    def get_absolute_url(self):
+        return ('testapp.views.ContainerInstance', [self.key])
+
+
+class ExampleItem(models.Model):
+    """Item.  Belongs to a container and has an index number and a note.
+    Items are uniquely identified by their container and index number."""
+    container = models.ForeignKey(ExampleContainer, related_name='items')
+    index = models.IntegerField()
+    note = models.CharField(max_length=1024)
+    unique_together = (container, index)
\ No newline at end of file

src/testapp/tests.py

@@ -9,7 +9,8 @@ from django.test import TestCase
 from django.core.urlresolvers import reverse
 from testapp import views
 import json
-from rest.utils import xml2dict, dict2xml
+#from rest.utils import xml2dict, dict2xml
+
 
 class AcceptHeaderTests(TestCase):
     def assert_accept_mimetype(self, mimetype, expect=None, expect_match=True):
@@ -45,6 +46,10 @@ class AcceptHeaderTests(TestCase):
     def test_invalid_accept_header_returns_406(self):
         resp = self.client.get(reverse(views.ReadOnlyResource), HTTP_ACCEPT='invalid/invalid')
         self.assertEquals(resp.status_code, 406)
+    
+    def test_prefer_specific(self):
+        self.fail("Test not implemented")
+
 
 class AllowedMethodsTests(TestCase):
     def test_reading_read_only_allowed(self):
@@ -63,6 +68,7 @@ class AllowedMethodsTests(TestCase):
         resp = self.client.put(reverse(views.WriteOnlyResource), {})
         self.assertEquals(resp.status_code, 200)
 
+
 class EncodeDecodeTests(TestCase):
     def setUp(self):
         super(self.__class__, self).setUp()
@@ -70,36 +76,71 @@ class EncodeDecodeTests(TestCase):
 
     def test_encode_form_decode_json(self):
         content = self.input
-        resp = self.client.put(reverse(views.WriteOnlyResource), content, HTTP_ACCEPT='application/json')
+        resp = self.client.put(reverse(views.WriteOnlyResource), content)
         output = json.loads(resp.content)
         self.assertEquals(self.input, output)
 
     def test_encode_json_decode_json(self):
         content = json.dumps(self.input)
-        resp = self.client.put(reverse(views.WriteOnlyResource), content, 'application/json', HTTP_ACCEPT='application/json')
+        resp = self.client.put(reverse(views.WriteOnlyResource), content, 'application/json')
         output = json.loads(resp.content)
         self.assertEquals(self.input, output)
 
-    def test_encode_xml_decode_json(self):
-        content = dict2xml(self.input)
-        resp = self.client.put(reverse(views.WriteOnlyResource), content, 'application/json', HTTP_ACCEPT='application/json')
+    #def test_encode_xml_decode_json(self):
+    #    content = dict2xml(self.input)
+    #    resp = self.client.put(reverse(views.WriteOnlyResource), content, 'application/json', HTTP_ACCEPT='application/json')
+    #    output = json.loads(resp.content)
+    #    self.assertEquals(self.input, output)
+
+    #def test_encode_form_decode_xml(self):
+    #    content = self.input
+    #    resp = self.client.put(reverse(views.WriteOnlyResource), content, HTTP_ACCEPT='application/xml')
+    #    output = xml2dict(resp.content)
+    #    self.assertEquals(self.input, output)
+
+    #def test_encode_json_decode_xml(self):
+    #    content = json.dumps(self.input)
+    #    resp = self.client.put(reverse(views.WriteOnlyResource), content, 'application/json', HTTP_ACCEPT='application/xml')
+    #    output = xml2dict(resp.content)
+    #    self.assertEquals(self.input, output)
+
+    #def test_encode_xml_decode_xml(self):
+    #    content = dict2xml(self.input)
+    #    resp = self.client.put(reverse(views.WriteOnlyResource), content, 'application/json', HTTP_ACCEPT='application/xml')
+    #    output = xml2dict(resp.content)
+    #    self.assertEquals(self.input, output)
+
+class ModelTests(TestCase):
+    def test_create_container(self):
+        content = json.dumps({'name': 'example'})
+        resp = self.client.post(reverse(views.ContainerFactory), content, 'application/json')
         output = json.loads(resp.content)
-        self.assertEquals(self.input, output)
-
-    def test_encode_form_decode_xml(self):
-        content = self.input
-        resp = self.client.put(reverse(views.WriteOnlyResource), content, HTTP_ACCEPT='application/xml')
-        output = xml2dict(resp.content)
-        self.assertEquals(self.input, output)
+        self.assertEquals(resp.status_code, 201)
+        self.assertEquals(output['name'], 'example')
+        self.assertEquals(set(output.keys()), set(('absolute_uri', 'name', 'key')))
 
-    def test_encode_json_decode_xml(self):
-        content = json.dumps(self.input)
-        resp = self.client.put(reverse(views.WriteOnlyResource), content, 'application/json', HTTP_ACCEPT='application/xml')
-        output = xml2dict(resp.content)
-        self.assertEquals(self.input, output)
+class CreatedModelTests(TestCase):
+    def setUp(self):
+        content = json.dumps({'name': 'example'})
+        resp = self.client.post(reverse(views.ContainerFactory), content, 'application/json', HTTP_ACCEPT='application/json')
+        self.container = json.loads(resp.content)
 
-    def test_encode_xml_decode_xml(self):
-        content = dict2xml(self.input)
-        resp = self.client.put(reverse(views.WriteOnlyResource), content, 'application/json', HTTP_ACCEPT='application/xml')
-        output = xml2dict(resp.content)
-        self.assertEquals(self.input, output)
+    def test_read_container(self):
+        resp = self.client.get(self.container["absolute_uri"])
+        self.assertEquals(resp.status_code, 200)
+        container = json.loads(resp.content)
+        self.assertEquals(container, self.container)
\ No newline at end of file
+
+    def test_delete_container(self):
+        resp = self.client.delete(self.container["absolute_uri"])
+        self.assertEquals(resp.status_code, 204)
+        self.assertEquals(resp.content, '')
+
+    def test_update_container(self):
+        self.container['name'] = 'new'
+        content = json.dumps(self.container)
+        resp = self.client.put(self.container["absolute_uri"], content, 'application/json')
+        self.assertEquals(resp.status_code, 200)
+        container = json.loads(resp.content)
+        self.assertEquals(container, self.container)
+        
\ No newline at end of file

src/testapp/urls.py

@@ -5,4 +5,7 @@ urlpatterns = patterns('testapp.views',
     (r'^read-only$', 'ReadOnlyResource'),
     (r'^write-only$', 'WriteOnlyResource'),
     (r'^read-write$', 'ReadWriteResource'),
+    (r'^model$', 'ModelFormResource'),
+    (r'^container$', 'ContainerFactory'),
+    (r'^container/((?P<key>[^/]+))$', 'ContainerInstance'),
 )

src/testapp/views.py

-from rest.resource import Resource
+from rest.resource import Resource, ModelResource
 from testapp.forms import ExampleForm
+from testapp.models import ExampleModel, ExampleContainer
  
 class RootResource(Resource):
     """This is my docstring
     """
-    allowed_methods = ('GET',)
+    allowed_operations = ('read',)
 
     def read(self, headers={}, *args, **kwargs):
         return (200, {'read-only-api': self.reverse(ReadOnlyResource),
                       'write-only-api': self.reverse(WriteOnlyResource),
-                      'read-write-api': self.reverse(ReadWriteResource)}, {})
+                      'read-write-api': self.reverse(ReadWriteResource),
+                      'model-api': self.reverse(ModelFormResource),
+                      'create-container': self.reverse(ContainerFactory)}, {})
 
 
 class ReadOnlyResource(Resource):
     """This is my docstring
     """
-    allowed_methods = ('GET',)
+    allowed_operations = ('read',)
 
     def read(self, headers={}, *args, **kwargs):
         return (200, {'ExampleString': 'Example',
@@ -26,13 +29,35 @@ class ReadOnlyResource(Resource):
 class WriteOnlyResource(Resource):
     """This is my docstring
     """
-    allowed_methods = ('PUT',)
+    allowed_operations = ('update',)
 
     def update(self, data, headers={}, *args, **kwargs):
         return (200, data, {})
 
 
 class ReadWriteResource(Resource):
-    allowed_methods = ('GET', 'PUT', 'DELETE')
+    allowed_operations = ('read', 'update', 'delete')
     create_form = ExampleForm
     update_form = ExampleForm
+
+
+class ModelFormResource(ModelResource):
+    allowed_operations = ('read', 'update', 'delete')
+    model = ExampleModel
+
+# Nice things: form validation is applied to any input type
+#              html forms for output
+#              output always serialized nicely
+class ContainerFactory(ModelResource):
+    allowed_operations = ('create',)
+    model = ExampleContainer
+    fields = ('absolute_uri', 'name', 'key')
+    form_fields = ('name',)
+
+
+class ContainerInstance(ModelResource):
+    allowed_operations = ('read', 'update', 'delete')
+    model = ExampleContainer
+    fields = ('absolute_uri', 'name', 'key')
+    form_fields = ('name',)
+