Align dict/JSON/YAML import to headers by key, not by position

src/tablib/core.py

@@ -371,7 +371,10 @@ def _set_dict(self, pickle):
             self.wipe()
             self.headers = list(pickle[0].keys())
             for row in pickle:
-                self.append(Row(list(row.values())))
+                # Align values to the headers by key, not by position: JSON
+                # object member order is not significant (RFC 8259) and dict
+                # keys may legitimately differ in order across records.
+                self.append(Row([row.get(header) for header in self.headers]))
         else:
             raise UnsupportedFormat(error_details)
 

tests/test_tablib.py

@@ -1693,6 +1693,14 @@ def test_json_import_set(self):
 
         self.assertEqual(json.loads(_json), json.loads(data.json))
 
+    def test_json_import_heterogeneous_key_order(self):
+        """Records with keys in a different order must align by key, not position."""
+        ds = tablib.Dataset()
+        ds.json = '[{"name": "alice", "age": 30}, {"age": 25, "name": "bob"}]'
+        self.assertEqual(list(ds.headers), ['name', 'age'])
+        self.assertEqual(ds[0], ('alice', 30))
+        self.assertEqual(ds[1], ('bob', 25))
+
     def test_json_export(self):
         """Verify exporting dataset object as JSON"""