ios - updateChildValues: not saving all data -

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a user enters post tags. tags come array , i'm supposed check if tag exist or not , use tagid write post database tags relate post (see below). whats happening last tagid being recorded database not of them

for item in tags {      ref.child("tags").observesingleeventoftype(.value, withblock: { snapshot in         if snapshot.childsnapshotforpath(item.lowercasestring).exists() {             let tagkey = snapshot.childsnapshotforpath(item.lowercasestring).value as! string             self.savetagid(tagkey, postkey: postkey, uid: userid)          } else {             let tagkey = self.ref.child("tags").childbyautoid().key             let tagupdate = ["/tags/\(item.lowercasestring)": tagkey]             self.ref.updatechildvalues(tagupdate)              self.savetagid(tagkey, postkey: postkey, uid: userid)          }     }) }  func savetagid(tagid: string, postkey: string, uid: string){      let posttag = [tagid: true]     print("post tag\(posttag)")     ref.updatechildvalues(["posts/\(postkey)/tagids": posttag,         "user-posts/\(uid)/\(postkey)/tagids": posttag]) }

this database looks like. in tagids there should more 1 if there more 1 tag

{     "posts": {         "-knlbs1ec6tkfla2y4sc": {             "author": "michele",             "post": "hello human",             "tagids": {                 "-knlbs76y5i0kdv1oxs_": true             },             "tagnames": "test, hope works",             "uid": "qgacte84gbsc7uun4wemxcdhxwo2"         },         "-knlcb1cacxxplpyc5ql": {             "author": "michele",             "post": "you're hope",             "tagids": {                 "-knlcb723scwihyduwrn": true             },             "tagnames": "help, obi wan",             "uid": "qgacte84gbsc7uun4wemxcdhxwo2"         }     },     "tags": {         "help": "-knlcb71o5l2phdqdl62",         "hope works": "-knlbs76y5i0kdv1oxs_",         "obi wan": "-knlcb723scwihyduwrn",         "test": "-knlbs7509hq29waf8ms"     } }


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