Ionic 离子Angular - Firebase离线缓存两次返回一次数据

s71maibg 于 2022-12-08 发布在 Ionic

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Description of the initial situation:

I have enabled data persistence on Firestore by following the documentation: https://firebase.google.com/docs/firestore/manage-data/enable-offline It works, when I make an offline write request my listener receives the information and I can display it locally. When I get back to the connection the data are well synchronized.

Description of the problem:

I open the application on android and go offline.
I make an offline modification to firestore DB.
I kill my application.
I reconnect, still offline.
I try to read the data from the cache.
One time out of two : I get the data, it works perfectly.
The other time : The cache is like empty and doesn't return any data.

When I say one out of two times, it means that when I kill the app and don't get the data, if I kill it again and open it, I get the data again (without being in online mode). If I do it again, I lose them. (And this boucle is infinite)
The request to get the data is the same each time.
PS : On PWA version, it work every time

Question: How do I get the data from the cache every time? Did I miss a step?

ionic-framework

来源：https://stackoverflow.com/questions/74603961/ionic-angular-firebase-offline-cache-returns-data-one-out-of-two-times

1条答案

按热度按时间

2lpgd9681#

我终于找到了解决办法：
我使用AngularFire以这种方式启用持久性（在app.module.ts中）：

@NgModule({
    declarations: [AppComponent],
    imports: [
        ...
        AngularFireModule.initializeApp(firebaseConfig),
        AngularFirestoreModule.enablePersistence({synchronizeTabs: true}),
        ...
    providers: [
        ...
    ],
    bootstrap: [AppComponent],
})

必须启用选项（synchronizeTabs）。我的猜测是，应用程序没有被Android完全杀死，因此在下次打开时被算作第二个选项卡。
接下来，我这样使用它：对于每个请求，我检查用户是否在线，如果不在线，我切换到离线模式：

private async disableNetWorkIfOffline() {
    if (!this.networkService.isOnline()) {
        await this.afs.firestore.disableNetwork();
    } else {
        await this.afs.firestore.enableNetwork();
    }
}

是我的一个服务
我以为我从文档中了解到这是自动完成的，但由于某种原因，这不是我的情况，所以我手动完成

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Ionic 离子Angular - Firebase离线缓存两次返回一次数据

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