In my React Native app I get a value from Firebase using
this.getRef()
.doc(<something>)
.collection(<something>)
.doc(<something>)
I want to log the value returned by that, but I don't know if it returns a promise. I'd like to do something like
let a = this.getRef()
.doc(<something>)
.collection(<something>)
.doc(<something>)
console.log(a)
How should I approach this?
At the moment, you just have a reference to the document, not the document itself. To get the document a single time, use .get. This will return a promise:
this.getRef()
.doc(<something>)
.collection(<something>)
.doc(<something>)
.get()
.then(doc => {
console.log(doc.data());
})
// Or using async await:
const someFunction = async () => {
const doc = await this.getRef()
.doc(<something>)
.collection(<something>)
.doc(<something>)
.get()
console.log(doc.data());
}
Alternatively, if you want to continue listening for changes, use onSnapshot:
const unsubscribe = this.getRef()
.doc(<something>)
.collection(<something>)
.doc(<something>)
.onSnapshot(snapshot => {
console.log(snapshot.data());
});
// Later you can call unsubscribe() to stop listening