erp5_hal_json_style: get last form from correct document

context is actually a web section

bt5/erp5_hal_json_style/SkinTemplateItem/portal_skins/erp5_hal_json_style/ERP5Document_getHateoas.py

@@ -997,7 +997,7 @@ def renderForm(traversed_document, form, response_dict, key_prefix=None, selecti
     # ... so we can do some magic with it (especially embedded listbox if exists)!
     try:
       if last_form_id:
-        last_form = getattr(context, last_form_id)
+        last_form = getattr(traversed_document, last_form_id)
         last_listbox = last_form.Base_getListbox()
     except AttributeError:
       pass

bt5/erp5_hal_json_style/TestTemplateItem/portal_components/test.erp5.testHalJsonStyle.py

@@ -1076,6 +1076,28 @@ class TestERP5Document_getHateoas_mode_traverse(ERP5HALJSONStyleSkinsMixin):
     self.assertIn("dialog_id", field_names)
     # no need for dialog_method because that one is hardcoded in javascript
 
+  @simulate('Base_getRequestHeader', '*args, **kwargs',
+            'return "application/hal+json"')
+  @changeSkin('Hal')
+  def test_getHateoasDocument_last_form_rendering_context(self):
+    self.portal.foo_module.FooModule_viewFooList.listbox.manage_tales_xmlrpc(dict(selection_name='python: "foo_selection" if here.getPortalType()=="Foo Module" else "wrong_selection"'))
+    fake_request = do_fake_request("GET")
+    result = self.portal.web_site_module.hateoas.ERP5Document_getHateoas(
+      REQUEST=fake_request,
+      mode="traverse",
+      relative_url=self.portal.foo_module.getRelativeUrl(),
+      view="create_a_document",
+      extra_param_json = {"form_id": "FooModule_viewFooList"}
+      )
+
+    self.assertEqual(fake_request.RESPONSE.status, 200)
+    self.assertEqual(fake_request.RESPONSE.getHeader('Content-Type'),
+      "application/hal+json"
+    )
+    result_dict = json.loads(result)
+    self.assertEqual(result_dict['_embedded']['_view']['selection_name']['default'], 'foo_selection')
+    self.portal.foo_module.FooModule_viewFooList.listbox.manage_tales_xmlrpc(dict(selection_name=''))
+
   @simulate('Base_getRequestUrl', '*args, **kwargs',
       'return "http://example.org/bar"')
   @simulate('Base_getRequestHeader', '*args, **kwargs',