erp5_hal_json_style: cast select_list before handling group_by

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

@@ -1644,6 +1644,12 @@ def calculateHateoas(is_portal=None, is_site_root=None, traversed_document=None,
       count_method = source_field.get_value('count_method')
     has_listbox_a_count_method = (count_method != "") and (count_method.getMethodName() != list_method)
 
+    # Cast to list if only one element is provided
+    if select_list is None:
+      select_list = []
+    elif same_type(select_list, ""):
+      select_list = [select_list]
+
     # hardcoded responses for site and portal objects (which are not Documents!)
     # we let the flow to continue because the result of a list_method call can
     # be similar - they can in practice return anything
@@ -1780,12 +1786,6 @@ def calculateHateoas(is_portal=None, is_site_root=None, traversed_document=None,
         REQUEST.set(k, v)
       search_result_iterable = callable_list_method(**catalog_kw)
 
-    # Cast to list if only one element is provided
-    if select_list is None:
-      select_list = []
-    elif same_type(select_list, ""):
-      select_list = [select_list]
-
     # extract form field definition into `editable_field_dict`
     editable_field_dict = {}
     url_column_dict = {}

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

@@ -1461,9 +1461,9 @@ class TestERP5Document_getHateoas_mode_search(ERP5HALJSONStyleSkinsMixin):
   def test_getHateoas_group_by_param(self):
     fake_request = do_fake_request("GET")
     result = self.portal.web_site_module.hateoas.ERP5Document_getHateoas(REQUEST=fake_request, mode="search",
-                                                                         select_list=['count(*)'],
+                                                                         select_list='count(*)',
                                                                          query='portal_type:"Base Category"',
-                                                                         group_by=["portal_type"])
+                                                                         group_by="portal_type")
     self.assertEquals(fake_request.RESPONSE.status, 200)
     self.assertEquals(fake_request.RESPONSE.getHeader('Content-Type'),
       "application/hal+json"
@@ -1476,7 +1476,7 @@ class TestERP5Document_getHateoas_mode_search(ERP5HALJSONStyleSkinsMixin):
     self.assertEqual(result_dict['_query'], 'portal_type:"Base Category"')
     self.assertEqual(result_dict['_local_roles'], None)
     self.assertEqual(result_dict['_select_list'], ['count(*)'])
-    self.assertEqual(result_dict['_group_by'], ["portal_type"])
+    self.assertEqual(result_dict['_group_by'], "portal_type")
     self.assertEqual(result_dict['_sort_on'], None)
 
     self.assertEqual(len(result_dict['_embedded']['contents']), 1)