Support for optional parameters (#297)

* encode optional parameter in payload

* test optional parameter payload

Author: dsavchenko

oda_api/api.py

@@ -615,6 +615,8 @@ def parameters_dict_payload(self):
         for k, v in p.items():
             if isinstance(v, (list, dict, set)) and (k not in ['catalog_selected_objects', 'selected_catalog', 'scw_list']):
                 p[k] = json.dumps(v)
+            if v is None and k != 'token':
+                p[k] = '\x00'
 
         if self.is_submitted:
             return {
@@ -922,7 +924,9 @@ def _decode_res_json(self, res):
             else:
                 res = ast.literal_eval(str(res).replace('null', 'None'))
 
+            # what is it for?
             self.dig_list(res)
+            
             return res
         except Exception as e:
 

tests/test_basic.py

@@ -763,4 +763,14 @@ def test_structured_param_encoding():
     assert payload['str_par'] == 'foo'
     assert payload['num_par'] == 4.5
     assert payload['dic_par'] == '{"a": 4.6, "b": 3.4}'
-    assert payload['lst_par'] == '["spam", "ham"]'
+    assert payload['lst_par'] == '["spam", "ham"]'
+
+def test_none_payload():
+    disp = oda_api.api.DispatcherAPI(url='http://example.org/dispatcher')
+    disp.parameters_dict = {
+        'optional_par': None,
+    }
+    
+    payload = disp.parameters_dict_payload
+    assert payload['optional_par'] == '\x00'
+