1 files changed, 16 insertions, 0 deletions
diff --git a/gn3/db/__init__.py b/gn3/db/__init__.py
index 1eb7b12..19135fc 100644
--- a/gn3/db/__init__.py
+++ b/gn3/db/__init__.py
@@ -68,3 +68,19 @@ def fetchone(conn: Any,
     with conn.cursor() as cursor:
         cursor.execute(sql)
         return DATACLASSMAP[table](*cursor.fetchone())
+
+
+def diff_from_dict(old: Dict, new: Dict) -> Dict:
+    """Construct a new dict with a specific structure that contains the difference
+between the 2 dicts in the structure:
+
+diff_from_dict({"id": 1, "data": "a"}, {"id": 2, "data": "b"})
+
+Should return:
+
+{"id": {"old": 1, "new": 2}, "data": {"old": "a", "new": "b"}}
+    """
+    dict_ = {}
+    for key, value in old.items():
+        dict_[key] = {"old": old[key], "new": new[key]}
+    return dict_