fix(computed): re-calculate when object path changed

src/reactive/ObjectDeps.ts

@@ -23,15 +23,11 @@ export class ObjectDeps<T = any> implements Deps {
 
   isDirty(): boolean {
     const rootState = this.getState();
-
     if (this.root === rootState) return false;
-
-    if (this.snapshot === this.getSnapshot(rootState)) {
-      this.root = rootState;
-      return false;
-    }
-
-    return true;
+    const { pathChanged, snapshot: nextSnapshot } = this.getSnapshot(rootState);
+    if (pathChanged || this.snapshot !== nextSnapshot) return true;
+    this.root = rootState;
+    return false;
   }
 
   get id(): string {
@@ -51,16 +47,17 @@ export class ObjectDeps<T = any> implements Deps {
     return this.store.getState()[this.model];
   }
 
-  protected getSnapshot(state: any) {
+  protected getSnapshot(state: any): { pathChanged: boolean; snapshot: any } {
     const deps = this.deps;
     let snapshot = state;
-
     for (let i = 0; i < deps.length; ++i) {
-      if (!isObject<Record<string, any>>(snapshot)) break;
+      if (!isObject<Record<string, any>>(snapshot)) {
+        return { pathChanged: true, snapshot };
+      }
       snapshot = snapshot[deps[i]!];
     }
 
-    return snapshot;
+    return { pathChanged: false, snapshot };
   }
 
   protected proxy(currentState: Record<string, any>): any {

test/computed.test.ts

@@ -379,3 +379,41 @@ test('array should always be deps', () => {
   model.myData();
   expect(spy).toBeCalledTimes(4);
 });
+
+test('re-calculate when path changed', () => {
+  const spy = vitest.fn();
+
+  const model = defineModel('re-calculate-path-changed', {
+    initialState: {
+      foo: { bar: undefined } as undefined | { bar: string | undefined },
+      baz: '123',
+    },
+    reducers: {
+      updateFoo(state, foo: undefined | { bar: string | undefined }) {
+        state.foo = foo;
+      },
+    },
+    computed: {
+      myData() {
+        const foo = this.state.foo;
+        spy();
+        return foo ? foo.bar : this.state.baz;
+      },
+    },
+  });
+
+  expect(model.myData()).toBeUndefined();
+  expect(spy).toBeCalledTimes(1);
+  model.updateFoo(undefined);
+  expect(model.myData()).toBe('123');
+  expect(spy).toBeCalledTimes(2);
+  model.updateFoo({ bar: undefined });
+  expect(model.myData()).toBeUndefined();
+  expect(spy).toBeCalledTimes(3);
+  model.updateFoo({ bar: 'abc' });
+  expect(model.myData()).toBe('abc');
+  expect(spy).toBeCalledTimes(4);
+  model.updateFoo({ bar: undefined });
+  expect(model.myData()).toBeUndefined();
+  expect(spy).toBeCalledTimes(5);
+});