rewrite: New data ORM.

bot/data/adapted.py

@@ -0,0 +1,29 @@
+# from enum import Enum
+from typing import Optional
+from psycopg.types.enum import register_enum, EnumInfo
+from .registry import Attachable, Registry
+
+
+class RegisterEnum(Attachable):
+    def __init__(self, enum, name: Optional[str] = None, mapper=None):
+        super().__init__()
+        self.enum = enum
+        self.name = name or enum.__name__
+        self.mapping = mapper(enum) if mapper is not None else self._mapper()
+
+    def _mapper(self):
+        return {m: m.value[0] for m in self.enum}
+
+    def attach_to(self, registry: Registry):
+        self._registry = registry
+        registry.init_task(self.on_init)
+        return self
+
+    async def on_init(self, registry: Registry):
+        connection = await registry._conn.get_connection()
+        if connection is None:
+            raise ValueError("Cannot Init without connection.")
+        info = await EnumInfo.fetch(connection, self.name)
+        if info is None:
+            raise ValueError(f"Enum {self.name} not found in database.")
+        register_enum(info, connection, self.enum, mapping=self.mapping)