My Angular app utilizes Firestore for storing data. I have a service set up to retrieve data in the following way:
fetchCollectionColors(name) {
this.db.collectionGroup('collection-colors', ref => ref.where('product', '==', name))
.valueChanges().subscribe( (val: []) => {
this.collectionColors.next(val);
});
}
I am looking for guidance on how to handle errors during the query and if any occur, how can I retry?
When using the subscribe method, it is important to provide a second argument in case of errors:
Rx.Observable.prototype.subscribe([observer] | [onNext], [onError], [onCompleted])
[observer] (Observer): The object that will receive notifications.
[onNext] (Function): Function to be called for each element in the observable sequence.
- [onError] (Function): Function to be executed if there is an error during the process.
- [onCompleted] (Function): Function to be triggered when the observable sequence completes successfully.
To handle this scenario effectively, you can follow these steps:
.valueChanges().subscribe( (val: []) => {
this.collectionColors.next(val);
},error => {
console.log(error);
});
If you encounter an error, it is advisable to handle it and run your code again:
Handle the error by catching it and re-running the code:
this.db.collectionGroup('collection-colors', ref => ref.where('product', '==', name))
.valueChanges().subscribe( (val: []) => {
this.collectionColors.next(val);
}, error => {
// Customize your actions here
console.log(error);
});
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