Is it possible to fetch only a single document based on a field in Cloud-Firestore?

Question

is there a possibility to fetch a document based on a field? For example, if I have a collection called users that contains documents such as "usrID1", "usrID2", ... and each has a field inside called "city", now, can I search the entire collection and fetch ONLY the ones that has the field "city" equal to "New York"?

I know if I do it this way firebase.firestore().collection('users').get() and then extract only the needed data like .... doc.data().city but this would cost me a lot as each user is fetching the entire collection whenever they query that, moreover, its risky as each user will have the data of all other users.

Answer 1

您可以使用 firebase.firestore().collection('users').where("city", isEqualTo: "New York").get()