fix: build_filter_conditions utils method (#277)

* initial commit (new test should fail)

* fix: build_filter_conditions

Author: aMahanna

Diff for: arango/utils.py

@@ -6,6 +6,7 @@
     "is_none_or_str",
 ]
 
+import json
 import logging
 from contextlib import contextmanager
 from typing import Any, Iterator, Sequence, Union
@@ -119,11 +120,5 @@ def build_filter_conditions(filters: Json) -> str:
     if not filters:
         return ""
 
-    def format_condition(key: str, value: Any) -> str:
-        if isinstance(value, str):
-            return f'doc.{key} == "{value}"'
-
-        return f"doc.{key} == {value}"
-
-    conditions = [format_condition(k, v) for k, v in filters.items()]
+    conditions = [f"doc.{k} == {json.dumps(v)}" for k, v in filters.items()]
     return "FILTER " + " AND ".join(conditions)

Diff for: tests/test_document.py

@@ -1175,6 +1175,12 @@ def test_document_find(col, bad_col, docs):
     assert len(found) == 1
     assert found[0]["_key"] == "1"
 
+    # Test find with dict value with None
+    data = {"dict": {"foo": "bar", "foo_2": None}}
+    col.insert(data)
+    found = list(col.find(data))
+    assert len(found) == 1
+
     # Test find with multiple conditions
     found = list(col.find({"val": 2, "text": "foo"}))
     assert len(found) == 1