No need for special model attributes in Backend

src/backend/backend.py

@@ -20,7 +20,6 @@ from .models.filters import FieldSubstringFilter
 from .models.items import Account
 from .models.model import Model
 from .models.model_store import ModelStore
-from .models.special_models import AllRooms, MatchingAccounts
 from .user_files import Accounts, History, Theme, UISettings, UIState
 
 # Logging configuration
@@ -76,13 +75,11 @@ class Backend:
     def __init__(self) -> None:
         self.appdirs = AppDirs(appname=__app_name__, roaming=True)
 
-        self.saved_accounts: Accounts   = Accounts(self)
-        self.ui_settings:    UISettings = UISettings(self)
-        self.ui_state:       UIState    = UIState(self)
-        self.history:        History    = History(self)
+        self.saved_accounts = Accounts(self)
+        self.ui_settings    = UISettings(self)
+        self.ui_state       = UIState(self)
+        self.history        = History(self)
 
-        self.all_rooms         = AllRooms()
-        self.matching_accounts = MatchingAccounts(self.all_rooms)
         self.models = ModelStore()
 
         self.clients: Dict[str, MatrixClient] = {}

src/backend/models/model_store.py

@@ -2,11 +2,11 @@
 
 from collections import UserDict
 from dataclasses import dataclass, field
-from typing import Dict, Type
+from typing import Dict
 
 from . import SyncId
 from .model import Model
-from .special_models import FilteredMembers
+from .special_models import AllRooms, FilteredMembers, MatchingAccounts
 
 
 @dataclass(frozen=True)
@@ -28,7 +28,11 @@ class ModelStore(UserDict):
 
         model: Model
 
-        if is_tuple and len(key) == 3 and key[2] == "filtered_members":
+        if key == "all_rooms":
+            model = AllRooms()
+        elif key == "matching_accounts":
+            model = MatchingAccounts(self["all_rooms"])
+        elif is_tuple and len(key) == 3 and key[2] == "filtered_members":
             model = FilteredMembers(user_id=key[0], room_id=key[1])
         else:
             model = Model(sync_id=key)  # type: ignore

src/backend/models/special_models.py

@@ -20,10 +20,11 @@ class AllRooms(FieldSubstringFilter):
 
 class MatchingAccounts(ModelFilter):
     def __init__(self, all_rooms: AllRooms) -> None:
-        super().__init__(sync_id="matching_accounts")
         self.all_rooms = all_rooms
         self.all_rooms.items_changed_callbacks.append(self.refilter)
 
+        super().__init__(sync_id="matching_accounts")
+
 
     def accept_source(self, source: Model) -> bool:
         return source.sync_id == "accounts"