refactori into packages

orm/fields/decorators.py

@@ -0,0 +1,27 @@
+from typing import Any, TYPE_CHECKING, Type
+
+from orm import ModelDefinitionError
+
+if TYPE_CHECKING:  # pragma no cover
+    from orm.fields import BaseField
+
+
+class RequiredParams:
+    def __init__(self, *args: str) -> None:
+        self._required = list(args)
+
+    def __call__(self, model_field_class: Type["BaseField"]) -> Type["BaseField"]:
+        old_init = model_field_class.__init__
+        model_field_class._old_init = old_init
+
+        def __init__(instance: "BaseField", *args: Any, **kwargs: Any) -> None:
+            super(instance.__class__, instance).__init__(*args, **kwargs)
+            for arg in self._required:
+                if arg not in kwargs:
+                    raise ModelDefinitionError(
+                        f"{instance.__class__.__name__} field requires parameter: {arg}"
+                    )
+                setattr(instance, arg, kwargs.pop(arg))
+
+        model_field_class.__init__ = __init__
+        return model_field_class