Fix ContextVar LookupError in cross-context usage

cashews/backends/interface.py

@@ -180,8 +180,7 @@ class ControlMixin:
     enable_by_default = True
 
     def __init__(self, *args, **kwargs) -> None:
-        self.__disable: ContextVar[set[Command]] = ContextVar(str(id(self)))
-        self.__disable.set(set())
+        self.__disable: ContextVar[set[Command]] = ContextVar(str(id(self)), default=set())
         self._control_set = False
         super().__init__(*args, **kwargs)
 

tests/test_bugs.py

@@ -1,6 +1,7 @@
 import asyncio
 
 from cashews import Cache
+from cashews.commands import Command
 
 
 async def test_issue_382():
@@ -15,3 +16,42 @@ def sync_get_item(item_id: int):
         return asyncio.run(get_item(item_id))
 
     await asyncio.get_running_loop().run_in_executor(None, sync_get_item, 123)
+
+
+async def test_control_mixin_cross_context():
+    """Test that ControlMixin's ContextVar works across different async contexts.
+
+    This simulates the FastAPI lifespan pattern where cache.setup() is called in one
+    context (lifespan) and cache operations are called in different contexts (HTTP requests).
+    """
+    cache = Cache()
+
+    # Setup cache in one context (simulating FastAPI lifespan)
+    cache.setup("mem://")
+    cache.enable()  # This calls self.__disable.get() internally
+
+    @cache(ttl=60, key="test:{value}")
+    async def cached_func(value: int):
+        return f"result_{value}"
+
+    # Test in a different async context (simulating HTTP request)
+    async def test_in_new_context():
+        # This should not raise LookupError when checking if cache is enabled/disabled
+        result = await cached_func(123)
+        assert result == "result_123"
+
+        # Test disable/enable in new context
+        cache.disable(Command.SET)
+        assert cache.is_disable(Command.SET)
+
+        cache.enable(Command.SET)
+        assert cache.is_enable(Command.SET)
+
+        return result
+
+    def sync_runner():
+        return asyncio.run(test_in_new_context())
+
+    # Run in executor with new event loop (different context)
+    result = await asyncio.get_running_loop().run_in_executor(None, sync_runner)
+    assert result == "result_123"