Get documents in Firebase where field is X in Swift 4

Question

I am looking to retrieve all documents from my collection in Swift where the field "groupId" == "31bc2501-7164-4f22-7b28-9f9005acbcf6" (a guid)

If I use the firebase document id, then that works:

i.e.

CollectionReference reference = db.collection("chats/XIiOrtRiYmLtzz1tzG2u")

but I want to query it by a field instead.

I see in Swift there is stuff like this:

var query = db.collection("chats").whereField("groupId", isEqualTo: "31bc2501-7164-4f22-7b28-9f9005acbcf6")

but it returns a query object, and I can't figure out how to "pop" it to execute the query and return to me a collection (most of the examples online seem to use different and outdated syntaxes to do this, and don't use whereField)

is there a way to query a collection inline like I did in the first example but using other fields than the primary key? Perhaps I'm querying the collection incorrectly?

Thanks, appreciate your time!

hey thanks, surprised I missed this (I actually did search, I swear)! :) So regarding this, I see this returns void (it just gives you all documents) but is there a way to store this as a reference, so I can use a a Snapshot Listener via addSnapshotListener? — NullHypothesis
– NullHypothesis, Commented Oct 5, 2018 at 18:52

Frank van Puffelen · Accepted Answer · 2018-10-05 18:52:53Z

From the Firebase documentation on getting multiple documents through a query:

db.collection("chats").whereField("groupId", isEqualTo: "31bc2501-7164-4f22-7b28-9f9005acbcf6") .getDocuments() { (querySnapshot, err) in if let err = err { print("Error getting documents: \(err)") } else { for document in querySnapshot!.documents { print("\(document.documentID) => \(document.data())") } } }

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