I´m facing a strange behavior with a query on my firestore project. One user of the project is like the owner of the system, we call him the producer. And the other users
, can belong to one producer
, so I have a collection of users
, where I have a field called producer
, with the producer ID
, like below.
{user: {id: '...', producer: '...', ...}
* Translate producer to produtor.
I have a functionality called a transfer, where I can transfer cash from one user account to another, but only within the users of the same producer. So I need to fetch all the users where the producer is the same as the logged user, on this collection, here is my function:
constructor(
private afAuth: AngularFireAuth,
private afs: AngularFirestore
) { }
fetchUsers() {
return this.afAuth.authState.pipe(
switchMap( user => { // Here I have the logged user
return this.afs.doc(`users/${user.uid}`).valueChanges() // Here I need his details on users collection
}),
first(),
switchMap( (user: any) => {
return this.afs.collection('users',
ref => ref.where('producer', '==', user.producer) // Now I want the other users from same producer
).valueChanges()
})
)
}
But it does not work, the only user on the result is the user calling the function. Is it a limitation of the Angular Fire or maybe I´m doing it in the wrong way?
I think it´s maybe a bug, because I could workaround this using get on document and then on collection:
return this.afAuth.authState.pipe(
switchMap( user => {
return this.afs.doc(`users/${user.uid}`).get()
}),
first(),
map( usuario => {
return usuario.data()
}),
switchMap( (usuario: any) => {
return this.afs.collection('users', ref => ref.where('produtor', '==', usuario.produtor)).get()
}),
first(),
map( data => {
let users = []
data.docs.map( doc => {
users.push(doc.data())
})
return users
})
)
This way, it returns all the users where the producer, produtor , is the same of logged in user. I´ll appreciate if someone could explain me why.
Looks like your OR query logic is incorrect.
return this.afs.collection('users',
ref => ref.where('producer', 'in', [user.producer, user.uid])
).valueChanges()
https://firebase.google.com/docs/firestore/query-data/queries
In fact it appears you do not need an OR condition at all. Why would user.producer
be set to two different types?
ie: if user.producer
is always set to a producer ID, then you can have just:
return this.afs.collection('users',
ref => ref.where('producer', '==', user.uid)
).valueChanges()
When you call.valueChanges() in Angular Fire, it returns an observable.
Observables open up a continuous channel of communication in which multiple values of data can be emitted over time.
So we need to get a value from an Observable and for that we need to subscribe to it. You could call the document with for valueChanges and attach a pipe(take(1)) as following, but get() is pretty handy.
this.afs.doc(`users/${user.uid}`).valueChanges()
.pipe(take(1))
.subscribe(v => {
console.log(v);
});
Please let me know if you need any further clarification.
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