Adding Dict, List, and RecordDict types

test/test_db.py

@@ -146,3 +146,28 @@ def test_datetime(db):
     sleep(1)
     user = db.save(user)
     assert user.last_updated >= user.created
+
+
+def test_mapping(db):
+    album = db.save(
+        examples.Album(
+            name="The Impossible Kid",
+            credits={"Produced By": "Aesop Rock", "Lyrics By": "Aesop Rock", "Puke in the MeowMix By": "Kirby"},
+            tracks=["Mystery Fish", "Rings", "Lotta Years", "Dorks"],
+        )
+    )
+    assert album.credits["Produced By"] == "Aesop Rock"
+    assert album.tracks[0] == "Mystery Fish"
+
+    aes = db.save(
+        examples.Artist(
+            name="Aesop Rock",
+            albums={"The Impossible Kid": album},
+        )
+    )
+
+    album = db.Album.get(doc_id=album.doc_id)
+    assert album.artist.uid == aes.uid
+    assert album.name in aes.albums
+    assert aes.albums[album.name].uid == album.uid
+    assert "Kirby" in aes.albums[album.name].credits.values()