rxfire | Combine multiple data sources | Authentication library
kandi X-RAY | rxfire Summary
kandi X-RAY | rxfire Summary
Combine multiple data sources. Simplify code-splitting of Firebase.
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QUESTION
In my React app, I want to check whether a background firebase function has created the document in Firestore before updating my UI. So I use the docData function from RxFire to subscribe to changes in the specific, "about-to-be-created-from-a-background-function" doc:
...ANSWER
Answered 2021-Feb-16 at 14:56The value of the "uid" field is not going to change as it is the reference to the document.
To confirm that the document was created, you should listen for changes in other fields, such as the name, as you already mentioned you do in your question.
Additionally, the same creation/write operations will invoke intermediately the updates.
QUESTION
This js reduce works fine to handle the query result:
...ANSWER
Answered 2020-Sep-17 at 13:27Your assumption is correct about the rxjs reduce operator.
"Applies an accumulator function over the source Observable, and returns the accumulated result when the source completes" - from the docs, see here: RxJS reduce docs
In your case source won't complete because that's how Firestore works, it is running endlessly without completion, until error happens or you unsubscribe manually.
For a rough example, you could use take(1) operator inside the pipe and it will complete the source Observable after emitting 1 event, thus the reduce will work, but it kills the main idea behind the Firestore Observable.
This is the way you can utilize rxjs reduce operator:
QUESTION
I'm trying to create an epic that fetches data from firestore using rxfire. On every emission of a value, an action needs to be dispatched. My codes looks like this:
...ANSWER
Answered 2020-Sep-13 at 20:54Your flatMap callback is async, which means it's not returning an observable that emits the fetchMenuSuccess action, it's returning a promise that resolves to the observable. Rx will unwrap the promise automatically, which means that the observable returned from this epic emits observables instead of subscribing to them and emitting their own values.
Removing the async keyword should fix it.
QUESTION
Kind of a niche question, but I know what the issue is so hopefully someone here can help me out. This is an Observable/RXFire issue, not an xstate issue.
I have this machine that invokes an observable:
...ANSWER
Answered 2020-Mar-29 at 06:34Observables can return multiple values over time, so it is up to collectionData() to decide when to finish (i.e. causing complete() to be called).
However, if you only want to take 1 value from the observable, you can try:
QUESTION
I'm using RXFire and RXJS.
...ANSWER
Answered 2020-Mar-28 at 20:04There are multiple ways to do that. For example:
QUESTION
I use a derived store in the code below. It feels like a strange construct because I only use the derived construct for the dynamic $session dependency and to get the normData. But not with $norm. I use $norm only once to kick off the derived store.
Nevertheless it seem to work fine. But I have to renew the subscription if the $session changes. Is it possible to update the RxFire / RxJs subscription without unsubscribing first?
...ANSWER
Answered 2019-Nov-12 at 07:44Ok, roughly get what you trying to describe over here.
You can actually use the reactive declaration to execute code when a variable / store changed.
In this case is to execute the resubscribe method:
QUESTION
I'm trying to dynamically change a query to firestore based on a value from the svelte store.
The view is currently updated with a value from the selectedYear store, but if the value gets updated this isn't propagated in a new query.
What should I change to make the query / books update whenever the year updates?
This is the code I'm currently using:
...ANSWER
Answered 2020-Jan-16 at 17:24Your query is not reactive.
You can use a derived store. Where the result (rxFire query) depends on Selected Year. I had the same kind of question and answered it here.
QUESTION
...Error while ionic cordova build
ANSWER
Answered 2019-Mar-29 at 14:37Somewhere in your your Sass files you specified contentbg as a color name,
If you meant it you should consider adding it to your $colors variable in src/theme/variables.scss
QUESTION
Summary: essentially I need something like from Users where usergroupIds in [1,3,5].
Given usergroupIds$ emit an array of group IDs [1,3,5]
I want to union all users by userids in usergroupIds and combine the userIds (distinct)
Here is what I came up with:
...ANSWER
Answered 2019-Jan-16 at 02:34See if this work. Basically it fires when usergroupIds$ emits and thus you get your new dynamic observable. shareReplay is needed if you always want the source observable usergroupdIds$ to emit the last saved value when subscribed
QUESTION
ANSWER
Answered 2018-Nov-27 at 15:52You're already very close to the solution. Let's go through the issues step-by-step.
First, it's not necessary to create a Subject just to transform your result from onSnapshot. Instead of this:
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