fix: fixed deprecation warning

creyPY/fastapi/models/base.py

@@ -1,5 +1,5 @@
 import uuid
-from datetime import datetime
+from datetime import datetime, timezone
 
 from sqlalchemy import Column, DateTime, String
 from sqlalchemy.dialects.postgresql import UUID
@@ -14,15 +14,30 @@ class Base:
     # Primary key as uuid
     id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
     created_at = Column(DateTime(timezone=True), server_default=func.now())
-    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    updated_at = Column(
+        DateTime(timezone=True),
+        default=lambda: datetime.now(timezone.utc),
+        onupdate=lambda: datetime.now(timezone.utc),
+    )
     created_by_id = Column(String)
 
     __name__: str
 
-    # TODO: Add default representation string
     # TODO: Add automated foreign key resolution
 
     # Generate __tablename__ automatically
     @declared_attr
     def __tablename__(cls) -> str:
         return cls.__name__.lower()
+
+    def __str__(self) -> str:
+        # if the object has a name, title or similar attribute, return it
+        if hasattr(self, "name"):
+            return str(self.name)  # type: ignore
+
+        # if the object has a title attribute, return it
+        if hasattr(self, "title"):
+            return str(self.title)  # type: ignore
+
+        # otherwise return the object's id
+        return str(self.id)