我正在尝试学习如何将Mobx与React Hooks一起使用。但是我不明白为什么当一个组件加载商店数据(使用loadData())时,我能够观察到商店中的更新值,但是当另一个组件访问商店数据时,一切都在商店数据中重置为默认值。我在这里想念什么?
我的开发平台正在使用Nodejs v12.16.1
我的React依赖项是:
“ mobx”:“ ^ 5.15.4”, “ mobx-react-lite”:“ ^ 1.5.2”, “ react”:“ ^ 16.13.1”,
import { createContext } from 'react';
import { observable, action, decorate, flow } from "mobx";
import agent from '../api/agent';
import { history } from "../index";
class ApplicationStore {
user = {
profile: { id: null, firstName: null, lastName: null, email: null, phoneNumber: null }
};
loading = false;
loadData = flow(function *() {
this.loading = true;
try {
const payload = yield agent.User.get('defaultUser');
this.user.profile.id = payload.user.profile.id;
this.user.profile.firstName = payload.user.profile.firstName;
this.user.profile.lastName = payload.user.profile.lastName;
this.user.profile.email = payload.user.profile.email;
this.user.profile.phoneNumber = payload.user.profile.phoneNumber;
} catch (err) {
console.log(err);
history.push('/systemDown');
} finally {
this.loading = false;
}
});
}
decorate(ApplicationStore, {
user: observable,
loading: observable,
//loadData: action, //Defining as an action or not makes no difference
})
export default createContext(new ApplicationStore()); //NOTE: Creating context here.
const HomePage = observer(() => {
const applicationStore = useContext(ApplicationStore);
useEffect(() => {
applicationStore.loadData();
}, [applicationStore]);
if (applicationStore.loading)
return <LoadingComponent content="Loading data..." />;
return (<DoSomething/>)
})
const DoSomething = observer(() => {
const applicationStore = useContext(ApplicationStore);
return (<div>
// ERROR: applicationStore.user.profile is back to its default values. Why???
</div>)
})