Fix `toml` encoding circular reference error. #110

benedict/serializers/toml.py

@@ -18,5 +18,5 @@ class TOMLSerializer(AbstractSerializer):
         return data
 
     def encode(self, d, **kwargs):
-        data = toml.dumps(d, **kwargs)
+        data = toml.dumps(dict(d), **kwargs)
         return data

tests/github/test_issue_0110.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+
+from benedict import benedict
+
+# import toml
+import unittest
+
+
+class github_issue_0110_test_case(unittest.TestCase):
+    """
+    This class describes a github issue 0110 test case.
+    https://github.com/fabiocaccamo/python-benedict/issues/110
+
+    To run this specific test:
+    - Run python -m unittest tests.github.test_issue_0110
+    """
+
+    def test_toml_circular_reference_detected(self):
+        d = {"a": {"b": {"c": 1}}}
+        d["e"] = benedict({"f": 2})
+
+        b = benedict()
+        b.update(d)
+        # b.merge(d)
+
+        t = b.to_toml()
+        print(t)