How can I convert asynchronous mode to synchronous? Just by Subscribing? I am getting data from Firebase using Firebase API's and displaying them in my app but due to asynchronous mode, the display event occurs before the data is retrieved. I am shifting to using AngularFire but not sure if AngularFire by default uses asynchronous. I want to wait for the data before my program moves to executing next steps. I am using Ionic2, have a provider which connects to Firebase, fetches data, stores in a local array in the provider with the ".then" method. The display page injects the provider and stores Firebase array data locally again in the display page, And then use the local variable in the html (ion-item) to display it. Basically, I want the data to be refreshed with any changes to Firebase data by any user.
Make use of 'async' pipe to display data from any observables in angular template. It populates the view whenever data is ready.
Below reference should help you to have an understanding of handling obervables using angularfire2. cheers :)
https://github.com/angular/angularfire2/blob/master/docs/2-retrieving-data-as-objects.md#retrieve-data
The only way to do this, is to use the 'async' in your template like below.
<ion-list>
<button ion-item class="center" *ngFor="let user of users | async" (click)="showOptions(user.$key, user.Name)">
{{user.title}}
</button>
</ion-list>
Above, there is a list of users type: 'FirebaseListObservable' which is included from the 'angularfire2/database' like below:
import { FirebaseListObservable } from 'angularfire2/database';
You can check this tutorial, which does exactly what you want and there is a live example on the description.
I suggest you to migrate to Ionic 3, it is much easier to use with firebase.
Related
i have manually added the data in cloud firestore
this how the data looks like .
Now using those fields i.e(id, location, model, equipmentCoordinates) how to create the constructor for that in flutter like this and call it. so that i can use the constructor and call it everwhere i need. It will be so helpful if you can answer this.
You can do it manually and also use this site for lengthy data models https://app.quicktype.io/
please check the image below for reference you can choose language and give data as you saved in the database,
I have a web app using Next and another app using Node. I am wanting to pass data from my Node app to my Next one in the form of a JSON object. I can get the data into the Next API by using a POST request and that works, what I want to know is if there is a way to pass the data from the API file into a component?
I would like to use pagination in Firestore so I can save a query state and automatically allow users to submit a page token to start a query again. The challenge I am seeing with this is that Firestore does not offer a query token or page token to resume iteration. However, after looking through the docs for GoLang, it looks like there is an exported PageInfo() method that returns a token I am interested in and an unexported fetch method.
Is there a method to use the exported PageInfo() values to allow me to fetch a new set of documents using that existing token?
To use pagination in Firestore Database you can use query cursors with limit() method as mentioned in this document. You can go through this youtube link to know more about it.
You may also consider using pageSize & pageToken query parameters and nextPageToken field with Firestore REST API as mentioned in this document to achieve pagination. There is a similar StackoverFlow thread which may help you.
I am using Firebase Translate Text Extension to translate few documents fields in my project. I want to add one more field that is in a documents in the nested collection:
So each document in collection "spots_test" has collection "reviews". I want to translate one field in each new review added, and I am wondering how can I set up it in Firebase Translate Text Extension, I was trying to set up something like this, but it didn't work:
Is there any way to handle nested collections?
I wasn't able to find proper documentation, however I experimented a bit. It seems to be working this way on my side (LevelOne is collection, test is sub-collection in any document of the collection):
LevelOne/{doc}/test
I don't think that it's important what is in the brackets I tested {something} as well. Working fine.
As this is Firebase Function base feature, I tried the same wildcards logic as in Firebase Function background triggers for Firestore. To be honest, as I didn't found any documentation in extension docs so I am not sure if this is intended behavior, but it works.
UPDATE:
I have continued the test. The extension is generating function visible in Functions tab of Firebase console. The trigger is visible there. The value of the trigger is gendered from extension configuration "Collection path"+{messageId}. So for example you can setup:
{collection}/{doc}/{subcollection}
In this situation translate text extension will work on every document in 2nd level collection no matter what the path is.
My Firebase Cloud Function for my Realtime Database (NOT CloudStore) listens onWrite and provides a change object with before and after.
This documentation here states:
If fieldMask is set, then only fields that changed are present in before.
How do I set this fieldMask? And when I set this fieldMask, will the resulting before object have the JSON structure of only the changed fields?
I don't think that class you linked "ChangeJson" is supposed to be part of the public documentation. When using an onWrite trigger, you actually get a Change object, which is different. Pay attention to that instead, not ChangeJson.
Feel free to use the "Send feedback" link at the top right of any page of Firebase documentation indicate what your confusion was on that page.