Add GET method form handling

Add handling of forms for the GET method.  The code requires the form for
the GET method to be explicitly declared (e.g., get_form = AGetForm); the
form attribute will only be used for POST and PUT but not GET.

djangorestframework/renderers.py

@@ -251,8 +251,10 @@ class DocumentingTemplateRenderer(BaseRenderer):
             except Exception:
                 pass
 
-        # If we still don't have a form instance then try to get an unbound form which can tunnel arbitrary content types
-        if not form_instance:
+        # If we still don't have a form instance then try to get an unbound form
+        # which can tunnel arbitrary content types.  Forms for the GET method
+        # must be explicit, so do not create a generic form.
+        if not form_instance and method != 'get':
             form_instance = self._get_generic_content_form(view)
 
         return form_instance
@@ -316,6 +318,7 @@ class DocumentingTemplateRenderer(BaseRenderer):
 
         content = self._get_content(self.view, self.view.request, obj, media_type)
 
+        get_form_instance = self._get_form_instance(self.view, 'get')
         put_form_instance = self._get_form_instance(self.view, 'put')
         post_form_instance = self._get_form_instance(self.view, 'post')
 
@@ -342,6 +345,7 @@ class DocumentingTemplateRenderer(BaseRenderer):
             'version': VERSION,
             'breadcrumblist': breadcrumb_list,
             'available_formats': self.view._rendered_formats,
+            'get_form': get_form_instance,
             'put_form': put_form_instance,
             'post_form': post_form_instance,
             'FORMAT_PARAM': self._FORMAT_QUERY_PARAM,

djangorestframework/resources.py

@@ -182,15 +182,19 @@ class FormResource(Resource):
         """
         Returns the form class used to validate this resource.
         """
-        # A form on the view overrides a form on the resource.
-        form = getattr(self.view, 'form', None) or self.form
-
         # Use the requested method or determine the request method
         if method is None and hasattr(self.view, 'request') and hasattr(self.view, 'method'):
             method = self.view.method
         elif method is None and hasattr(self.view, 'request'):
             method = self.view.request.method
 
+        # A form on the view overrides a form on the resource.  The GET method
+        # must have its form explicity set (e.g., get_form).
+        if not method or method.lower() != 'get':
+            form = getattr(self.view, 'form', None) or self.form
+        else:
+            form = None
+
         # A method form on the view or resource overrides the general case.
         # Method forms are attributes like `get_form` `post_form` `put_form`.
         if method: