How can I change an array based on user in firebase?
I'm building an application uses Reactjs and Firebase, that handle users and each user can add, remove, update and of course display his favorite list. the structure for each user could be something like this {uid: '123', favList: ['1', '2']}. How can update the array favList, and doesn't add new record if the uid already exists?
Here's my code for adding:
const db = fire.firestore();
db.settings({
timestampsInSnapshots: true
});
db.collection('users').add({
favorites: this.state.favs,
uid: fire.auth().currentUser.uid
});
javascript reactjs firebase google-cloud-firestore
edited Jan 1 at 1:50
Frank van Puffelen
236k29381407
asked Dec 31 '18 at 21:18
Zeyad EtmanZeyad Etman
403516
add a comment |
I'm building an application uses Reactjs and Firebase, that handle users and each user can add, remove, update and of course display his favorite list. the structure for each user could be something like this {uid: '123', favList: ['1', '2']}. How can update the array favList, and doesn't add new record if the uid already exists?
Here's my code for adding:
const db = fire.firestore();
db.settings({
timestampsInSnapshots: true
});
db.collection('users').add({
favorites: this.state.favs,
uid: fire.auth().currentUser.uid
});
javascript reactjs firebase google-cloud-firestore
edited Jan 1 at 1:50
Frank van Puffelen
236k29381407
asked Dec 31 '18 at 21:18
Zeyad EtmanZeyad Etman
403516
add a comment |
I'm building an application uses Reactjs and Firebase, that handle users and each user can add, remove, update and of course display his favorite list. the structure for each user could be something like this {uid: '123', favList: ['1', '2']}. How can update the array favList, and doesn't add new record if the uid already exists?
Here's my code for adding:
const db = fire.firestore();
db.settings({
timestampsInSnapshots: true
});
db.collection('users').add({
favorites: this.state.favs,
uid: fire.auth().currentUser.uid
});
javascript reactjs firebase google-cloud-firestore
edited Jan 1 at 1:50
Frank van Puffelen
236k29381407
asked Dec 31 '18 at 21:18
Zeyad EtmanZeyad Etman
403516
I'm building an application uses Reactjs and Firebase, that handle users and each user can add, remove, update and of course display his favorite list. the structure for each user could be something like this {uid: '123', favList: ['1', '2']}. How can update the array favList, and doesn't add new record if the uid already exists?
Here's my code for adding:
const db = fire.firestore();
db.settings({
timestampsInSnapshots: true
});
db.collection('users').add({
favorites: this.state.favs,
uid: fire.auth().currentUser.uid
});
javascript reactjs firebase google-cloud-firestore
javascript reactjs firebase google-cloud-firestore
edited Jan 1 at 1:50
Frank van Puffelen
236k29381407
asked Dec 31 '18 at 21:18
Zeyad EtmanZeyad Etman
403516
edited Jan 1 at 1:50
Frank van Puffelen
236k29381407
asked Dec 31 '18 at 21:18
Zeyad EtmanZeyad Etman
403516
edited Jan 1 at 1:50
Frank van Puffelen
236k29381407
edited Jan 1 at 1:50
Frank van Puffelen
236k29381407
edited Jan 1 at 1:50
Frank van Puffelen
236k29381407
236k29381407
asked Dec 31 '18 at 21:18
Zeyad EtmanZeyad Etman
403516
asked Dec 31 '18 at 21:18
Zeyad EtmanZeyad Etman
403516
asked Dec 31 '18 at 21:18
Zeyad EtmanZeyad Etman
403516
403516
add a comment |
add a comment |
1 Answer
1
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oldest
votes
What you're trying to do is known as an array union operation in Firebase.
If you have a reference to the document where you want to add the UID to the favorites field:
documentRef.update({
favorites: firebase.firestore.FieldValue.arrayUnion(uid)
});
For more on this see the documentation on updating elements in an array.
answered Jan 1 at 1:54
Frank van PuffelenFrank van Puffelen
236k29381407
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
What you're trying to do is known as an array union operation in Firebase.
If you have a reference to the document where you want to add the UID to the favorites field:
documentRef.update({
favorites: firebase.firestore.FieldValue.arrayUnion(uid)
});
For more on this see the documentation on updating elements in an array.
answered Jan 1 at 1:54
Frank van PuffelenFrank van Puffelen
236k29381407
add a comment |
What you're trying to do is known as an array union operation in Firebase.
If you have a reference to the document where you want to add the UID to the favorites field:
documentRef.update({
favorites: firebase.firestore.FieldValue.arrayUnion(uid)
});
For more on this see the documentation on updating elements in an array.
answered Jan 1 at 1:54
Frank van PuffelenFrank van Puffelen
236k29381407
add a comment |
What you're trying to do is known as an array union operation in Firebase.
If you have a reference to the document where you want to add the UID to the favorites field:
documentRef.update({
favorites: firebase.firestore.FieldValue.arrayUnion(uid)
});
For more on this see the documentation on updating elements in an array.
answered Jan 1 at 1:54
Frank van PuffelenFrank van Puffelen
236k29381407
What you're trying to do is known as an array union operation in Firebase.
If you have a reference to the document where you want to add the UID to the favorites field:
documentRef.update({
favorites: firebase.firestore.FieldValue.arrayUnion(uid)
});
For more on this see the documentation on updating elements in an array.
answered Jan 1 at 1:54
Frank van PuffelenFrank van Puffelen
236k29381407
answered Jan 1 at 1:54
Frank van PuffelenFrank van Puffelen
236k29381407
answered Jan 1 at 1:54
Frank van PuffelenFrank van Puffelen
236k29381407
answered Jan 1 at 1:54
Frank van PuffelenFrank van Puffelen
236k29381407
236k29381407
add a comment |
add a comment |
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