Restore parent store func

Demo/store_hacker_news/store_hacker_news.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -1,14 +1,32 @@
 {
   "object": {
     "pins": [
+      {
+        "package": "OpenCombine",
+        "repositoryURL": "https://github.com/OpenCombine/OpenCombine.git",
+        "state": {
+          "branch": null,
+          "revision": "28993ae57de5a4ea7e164787636cafad442d568c",
+          "version": "0.12.0"
+        }
+      },
       {
         "package": "Store",
         "repositoryURL": "https://github.com/alexdrone/Store",
         "state": {
           "branch": "master",
-          "revision": "51b58ca7c52072356369fc41bf29a0e24bc48a93",
+          "revision": "41dd6f52d7c09f9ff200cbea9da9a9c1ece9fb39",
           "version": null
         }
+      },
+      {
+        "package": "swift-log",
+        "repositoryURL": "https://github.com/apple/swift-log.git",
+        "state": {
+          "branch": null,
+          "revision": "173f567a2dfec11d74588eea82cecea555bdc0bc",
+          "version": "1.4.0"
+        }
       }
     ]
   },

Demo/store_hacker_news/store_hacker_news/Store/RootStore.swift

@@ -62,7 +62,7 @@ class AppStateStore: CodableStore<AppState> {
   }
 
   func childStore(id: Item) -> Store<Item> {
-    Store(model: id, combine: CombineStore(parent: self))
+
   }
 }
 

Sources/Store/store/CodableStore.swift

@@ -116,7 +116,9 @@ open class CodableStore<M: Codable>: Store<M> {
     keyPath: WritableKeyPath<M, C>
   ) -> CodableStore<C> where M: Codable, C: Codable {
     let childModelStorage: ModelStorageBase<C> = modelStorage.makeChild(keyPath: keyPath)
-    return CodableStore<C>(modelStorage: childModelStorage)
+    let store = CodableStore<C>(modelStorage: childModelStorage)
+    store._parent = self
+    return store
   }
 
   // MARK: - Model Encode/Decode

Sources/Store/store/Store.swift

@@ -35,6 +35,9 @@ public protocol AnyStore: class {
   /// Manually notify all of the registered middleware services.
   /// - note: See `MiddlewareType.onTransactionStateChange`.
   func notifyMiddleware(transaction: AnyTransaction)
+
+  /// Recursively traverse the parents until it founds one that matches the specified model type.
+  func parent<T>(type: T.Type) -> Store<T>?
 }
 
 /// Represents a store that has an typed associated model.
@@ -89,6 +92,10 @@ open class Store<M>: ReducibleStore, Identifiable {
   // See `AnyStore`.
   public var middleware: [Middleware] = []
   public private(set) var modelStorage: ModelStorageBase<M>
+
+  // Internal
+  var _parent: AnyStore?
+
   // Private.
   private var _performWithoutNotifyingObservers: Bool = false
   private var _modelStorageObserver: AnyCancellable?
@@ -128,7 +135,16 @@ open class Store<M>: ReducibleStore, Identifiable {
   ///  - parameter keyPath: The keypath pointing at a subtree of the model object.
   public func makeChildStore<C>(keyPath: WritableKeyPath<M, C>) -> Store<C> {
     let childModelStorage: ModelStorageBase<C> = modelStorage.makeChild(keyPath: keyPath)
-    return Store<C>(modelStorage: childModelStorage)
+    let store = Store<C>(modelStorage: childModelStorage)
+    store._parent = self
+    return store
+  }
+
+  public func parent<T>(type: T.Type) -> Store<T>? {
+    if let parent = _parent as? Store<T> {
+      return parent
+    }
+    return _parent?.parent(type: type)
   }
 
   // MARK: Model updates