create_model support generics model

changes/3945-hot123s.md

@@ -0,0 +1 @@
+create_model support generics model

pydantic/main.py

@@ -4,7 +4,7 @@
 from enum import Enum
 from functools import partial
 from pathlib import Path
-from types import FunctionType
+from types import FunctionType, prepare_class, resolve_bases
 from typing import (
     TYPE_CHECKING,
     AbstractSet,
@@ -968,8 +968,12 @@ def create_model(
     namespace.update(fields)
     if __config__:
         namespace['Config'] = inherit_config(__config__, BaseConfig)
-
-    return type(__model_name, __base__, namespace)
+    resolved_bases = resolve_bases(__base__)
+    meta, ns, kwds = prepare_class(__model_name, resolved_bases)
+    if resolved_bases is not __base__:
+        ns['__orig_bases__'] = __base__
+    namespace.update(ns)
+    return meta(__model_name, resolved_bases, namespace, **kwds)
 
 
 _missing = object()

tests/test_create_model.py

@@ -1,6 +1,9 @@
+from typing import Generic, TypeVar
+
 import pytest
 
 from pydantic import BaseModel, Extra, Field, ValidationError, create_model, errors, validator
+from pydantic.generics import GenericModel
 
 
 def test_create_model():
@@ -205,3 +208,14 @@ class Config:
 
     m2 = create_model('M2', __config__=Config, a=(str, Field(...)))
     assert m2.schema()['properties'] == {'a': {'title': 'A', 'description': 'descr', 'type': 'string'}}
+
+
+def test_generics_model():
+    T = TypeVar('T')
+
+    class TestGenericModel(GenericModel):
+        pass
+
+    AAModel = create_model('AAModel', __base__=(TestGenericModel, Generic[T]), aa=(int, Field(0)))
+
+    assert AAModel[int](aa=1).aa == 1