Added more custom exceptions and prepared everything for documentation

classes/errors/pycord_user.py

@@ -1,3 +1,6 @@
+from bson import ObjectId
+
+
 class UserNotFoundError(Exception):
     """PycordUser could not find user with such an ID in the database"""
 
@@ -6,3 +9,33 @@ class UserNotFoundError(Exception):
         self.guild_id: int = guild_id
 
         super().__init__(f"User with id {self.user_id} was not found in guild {self.guild_id}")
+
+
+class UserAlreadyRegisteredForEventError(Exception):
+    """PycordUser is already registered for the provided event"""
+
+    def __init__(self, user_id: int, event_id: str | ObjectId) -> None:
+        self.user_id: int = user_id
+        self.event_id: str | ObjectId = event_id
+
+        super().__init__(f"User with id {self.user_id} is already registered for the event {self.event_id}")
+
+
+class UserNotRegisteredForEventError(Exception):
+    """PycordUser is not registered for the provided event"""
+
+    def __init__(self, user_id: int, event_id: str | ObjectId) -> None:
+        self.user_id: int = user_id
+        self.event_id: str | ObjectId = event_id
+
+        super().__init__(f"User with id {self.user_id} is not registered for the event {self.event_id}")
+
+
+class UserAlreadyCompletedEventError(Exception):
+    """PycordUser already completed the provided event"""
+
+    def __init__(self, user_id: int, event_id: str | ObjectId) -> None:
+        self.user_id: int = user_id
+        self.event_id: str | ObjectId = event_id
+
+        super().__init__(f"User with id {self.user_id} already completed the event {self.event_id}")