feat: added experimental init and annotation mixins

creyPY/fastapi/models/mixins.py

@@ -0,0 +1,35 @@
+from sqlalchemy import Column
+
+
+class AutoAnnotateMixin:
+    @classmethod
+    def __init_subclass__(cls) -> None:
+        super().__init_subclass__()
+        annotations = {}
+        for key, value in cls.__dict__.items():
+            if isinstance(value, Column):
+                annotations[key] = value.type.python_type
+        cls.__annotations__ = annotations
+
+
+class AutoInitMixin:
+    @classmethod
+    def __init_subclass__(cls) -> None:
+        super().__init_subclass__()
+        init_params = []
+        for key, value in cls.__dict__.items():
+            if isinstance(value, Column):
+                if not value.nullable and not value.default and not value.server_default:
+                    init_params.append((key, value.type.python_type))
+
+        def __init__(self, **kwargs):
+            super(cls, self).__init__()
+            for key, _ in init_params:
+                if key not in kwargs:
+                    raise TypeError(f"Missing required argument: {key}")
+                setattr(self, key, kwargs[key])
+            for key, value in kwargs.items():
+                if key not in init_params and hasattr(self.__class__, key):
+                    setattr(self, key, value)
+
+        cls.__init__ = __init__