add doc to collection firesbase code example
Example 1: firestore create document with auto 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);
});
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db.collection("cities").doc("TYO").set({
name: "Tokyo",
country: "Japan"
})
Example 2: firebase cloud method update
firebase deploy --only functions:functionNameHere