handle default issue with multiple inheritance

aredis_om/model/model.py

@@ -1320,11 +1320,13 @@ def __new__(cls, name, bases, attrs, **kwargs):  # noqa C901
         meta = meta or getattr(new_class, "Meta", None)
         base_meta = getattr(new_class, "_meta", None)
 
-        if len(bases) == 1:
-            for f_name in bases[0].model_fields:
-                field = bases[0].model_fields[f_name]
-                print(field)
-                new_class.model_fields[f_name] = field
+        if len(bases) >= 1:
+            for base_index in range(len(bases)):
+                model_fields = getattr(bases[base_index], "model_fields", [])
+                for f_name in model_fields:
+                    field = model_fields[f_name]
+                    print(field)
+                    new_class.model_fields[f_name] = field
 
         if meta and meta != DefaultMeta and meta != base_meta:
             new_class.Meta = meta

tests/test_hash_model.py

@@ -976,3 +976,40 @@ class Child(Model):
 
     assert rematerialized.age == 18
     assert rematerialized.bio is None
+
+@py_test_mark_asyncio
+async def test_grandchild_class_expression_proxy():
+    # https://github.com/redis/redis-om-python/issues/669 seeing weird issue with child classes initalizing all their undefined members as ExpressionProxies
+    class Model(HashModel):
+        first_name: str
+        last_name: str
+        age: int = Field(default=18)
+        bio: Optional[str] = Field(default=None)
+
+    class Child(Model):
+        other_name: str = "test"
+
+    class GrandChild(Child):
+        grand_name: str = "test"
+
+    class GreatGrandChild(GrandChild):
+        great_name: str = "test"
+
+    await Migrator().run()
+    m = GreatGrandChild(first_name="Steve", last_name="Lorello")
+    assert m.age == 18
+    await m.save()
+
+    assert m.age == 18
+    assert m.other_name == "test"
+    assert m.grand_name == "test"
+    assert m.great_name == "test"
+
+    rematerialized = await GreatGrandChild.find(GreatGrandChild.pk == m.pk).first()
+
+    assert rematerialized.age == 18
+    assert rematerialized.age != 19
+    assert rematerialized.bio is None
+    assert rematerialized.other_name == "test"
+    assert rematerialized.grand_name == "test"
+    assert rematerialized.great_name == "test"

tests/test_json_model.py

@@ -1195,6 +1195,43 @@ class Child(Model):
     assert rematerialized.age != 19
     assert rematerialized.bio is None
 
+@py_test_mark_asyncio
+async def test_grandchild_class_expression_proxy():
+    # https://github.com/redis/redis-om-python/issues/669 seeing weird issue with child classes initalizing all their undefined members as ExpressionProxies
+    class Model(JsonModel):
+        first_name: str
+        last_name: str
+        age: int = Field(default=18)
+        bio: Optional[str] = Field(default=None)
+
+    class Child(Model):
+        is_new: bool = True
+
+    class GrandChild(Child):
+        is_newer: bool = True
+
+    class GreatGrandChild(GrandChild):
+        is_great: bool = True
+
+    await Migrator().run()
+    m = GreatGrandChild(first_name="Steve", last_name="Lorello")
+    assert m.age == 18
+    await m.save()
+
+    assert m.age == 18
+    assert m.is_new is True
+    assert m.is_newer is True
+    assert m.is_great is True
+
+    rematerialized = await GreatGrandChild.find(GreatGrandChild.pk == m.pk).first()
+
+    assert rematerialized.age == 18
+    assert rematerialized.age != 19
+    assert rematerialized.bio is None
+    assert rematerialized.is_new is True
+    assert rematerialized.is_newer is True
+    assert rematerialized.is_great is True
+
 @py_test_mark_asyncio
 async def test_merged_model_error():
     class Player(EmbeddedJsonModel):