Answers for "firestore updating data"

1

firestore create document with auto id

// Add a new document with a generated id.
db.collection("cities").add({
    name: "Tokyo",
    country: "Japan"
})
.then(function(docRef) {
    console.log("Document written with ID: ", docRef.id);
})
.catch(function(error) {
    console.error("Error adding document: ", error);
});
---------------------------
//If you want to specify id then use .set() 
// e.x   /
db.collection("cities").doc("TYO").set({
    name: "Tokyo",
    country: "Japan"
})
Posted by: Guest on January-16-2021
1

update data firestore

db.collection("cities").doc("DC").update({
    capital: true
})
Posted by: Guest on August-28-2021
0

document.set() firebasefirestore java

var washingtonRef = db.collection("cities").doc("DC");
// Atomically add a new region to the "regions" array field.
washingtonRef.update({
    regions: firebase.firestore.FieldValue.arrayUnion("greater_virginia")
});
// Atomically remove a region from the "regions" array field.
washingtonRef.update({
    regions: firebase.firestore.FieldValue.arrayRemove("east_coast")
});
Posted by: Guest on July-20-2020

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