I am working on react-native with firestore and creating an offline application. The data should be stored in firestore when there is an healthy internet connection. If not, it should be stored in cache.
In firestore, there is an Enable offline data where the data can be stored offline. But, I didn't understand what and where exactly I've to write into that.
So anyone can help me out?
Thanks in advance
in your firebase file immediately after
firebase.initializeApp(firebbaseConfig)
firebase.firestore()
.enable persistence()
.catch(err => console.log(err)
The documentation for offline persistence states:
To use offline persistence, you don't need to make any changes to the
code that you use to access Cloud Firestore data. With offline
persistence enabled, the Cloud Firestore client library automatically
manages online and offline data access and synchronizes local data
when the device is back online.
So, you don't have to do anything to take this default behavior.
Firestore maintains copy of data locally, so even it writes data in offline and fetch it.
If you want to enable firestore persistence in your react native app, just copy paste the code from documentation to App.js, I am using the same and it is working fine.
Related
This is not a problematic question, it was asked because just wanted to know what's actually going on behind it, I can't find an answer in any documentation.
When i open the app without internet it shows the data from firebase, i try to restart then it also shows, i try to clear the cache but it shows the data like it shows from the local database, Why is this happening, is there a built-in local storage or something in Firebase Flutter?
Firestore SDKs cache any data that they've recently seen, as well as any pending writes from the local client that haven't been synchronized to the server yet. On mobile clients (iOS and Android) this cache is enabled by default, while on web you can enable it with an API call.
For more on this, see the Firebase documentation on accessing Firestore data while you're offline.
I have a clarifying question about Cloud Firestore and Flutter:
I am making an app that users can create log entries of sort, which will be saved on Firebase. But they might make up to 30 entries offline, before they have internet connection again.
And I know that Firestore has an offline feature, with which any created documents can be viewed offline because it is saved in the order of logging, and then synced with the database when internet connection is gained. But it is absolutely crucial that these logs cannot be lost in my app before having a chance of uploading it. Is there a way to ensure that my app will not lose this data before connecting to Firebase again, or should I create a Sembast database on the device, and save a copy of everything, and then check that once in a while against the database?
Does Firestore have offline contingency for if the phone's battery dies before it could sync with Firestore?
Or is there another solution I am unaware of?
For Android and iOS, offline persistence is enabled by default.
You don't have to do anything in your code.
Note there is a default cache size of 100 MB. This can be changed though, eg
let settings = Firestore.firestore().settings
settings.cacheSizeBytes = FirestoreCacheSizeUnlimited
Firestore.firestore().settings = settings
Does Firestore have offline contingency for if the phone's battery dies before it could sync with Firestore?
When Firestore's offline persistence is enabled, it stores data that your app has recently read, as well as any pending writes, to a database on the local device or browser. This disk based cache will survive restarts of the app/reloads of the page.
For new version of use below code -
FirebaseFirestore.instance.settings =
Settings(cacheSizeBytes: Settings.CACHE_SIZE_UNLIMITED);
I was able to configure the Firestore database in Firebase with my flutter app and also create and read documents from my collection but when I go to Firestore console I don't see the created data, also when I creat data manually I am unable to see it in my application.
I am using the test mode which means any user can read or write.
I hope someone can help me with this puzzle.
Thanks!!!
It sounds like the device/emulator that you are running on is not connected to the internet, or at least not to the Firestore servers. In that case, the client writes all local changes into a local database, waiting to send them to the server when it gets a connection. So the local app will work, but won't be able to synchronize its local cache with the database servers.
You might want to check the connection on your device, and any proxies that might exist between your app and the Firestore servers.
My iOS app's firestore cache seems to have got out of sync with Firestore. As a result I've had to disable persistence. Is there anyway to reset the cache? And is there a way to make sure it's constantly in sync? All I did was delete documents from the database!
There is now a feature in the API for clearing persistence. It is not recommended for anything but tests, but you can use
firebase.firestore().clearPersistence().catch(error => {
console.error('Could not enable persistence:', error.code);
})
It must run before the Firestore database is used.
There's no API for manipulating the local cache in any way. The Firestore SDK chooses what to store based on queries that you perform.
On Android, users can manually clear the local data for an app without uninstalling it. This will remove all the data locally stored by the app.
If you have a specific use case, please feel free to file a feature request.
My iOS app's firestore cache seems to have got out of sync with Firestore. As a result I've had to disable persistence. Is there anyway to reset the cache? And is there a way to make sure it's constantly in sync? All I did was delete documents from the database!
There is now a feature in the API for clearing persistence. It is not recommended for anything but tests, but you can use
firebase.firestore().clearPersistence().catch(error => {
console.error('Could not enable persistence:', error.code);
})
It must run before the Firestore database is used.
There's no API for manipulating the local cache in any way. The Firestore SDK chooses what to store based on queries that you perform.
On Android, users can manually clear the local data for an app without uninstalling it. This will remove all the data locally stored by the app.
If you have a specific use case, please feel free to file a feature request.