How to update firebase query?

Question

In my app i\'m sending this query:

let defaults = NSUserDefaults.standardUserDefaults()
var time: String?

if defaults.valueForKey(\"chatsLoadedTime\") != nil {
         


        

Answer 1

It appears what you are asking is

How do I query for all of the chatsRef child nodes starting at a particular time and when that notification occurs, stop observing that time, increment the time and watch for that time.

It helps if we know your Firebase data structure and what your complete query looks like but it appears you going the right direction:

Assuming you have a structure

chatsRef
  chat_00
    updated_time: "03"
  chat_01
    updated_time: "07"
  chat_02
    updated_time: "02"

and your query

let chatsRef = self.myRootRef.childByAppendingPath("chatsRef")

chatsRef.queryOrderedByChild("updated_time").queryStartingAtValue("02").observeEventType(.Value, withBlock: { snap in

    for child in snap.children {
        if let time = child.value["updated_time"] as? String {
            print(time)
        } 
    }
})

this will return all child nodes starting at 02, so the output is

02
07

and any future additions or changes to the existing node where updated_time is 02 or greater will return the results.

So if a child was added to the chatsRef node that contained updated_time: "04" then these results would be returned automatically

02
04
07

Keep in mind that .Value returns all of the child nodes that match the query criteria so you need to iterate over them by .children to get each nodes value.