So I have been developing my Job board application for a while now. I'm a total newbie to programming and swift. I wanted to allow my users to post jobs and view them and also apply for the jobs via the app. Similar to 'Freelancer' app. I am using Firebase for my database and the issue I have now is:
This is my Database Query :
"Users": {
"UserID" : {
"Region" : {
"autoID : {
"Job Title" : String
"Job Description" : String
"Company Name" : String
}
}
}
}
The thing is that I have to retrieve data from job details which is under autoID and UserID which always show an error - Cannot use multiple queryOrderedBy calls!
This is my retrieve function
func retrievePost() {
var ref: DatabaseReference!
ref = Database.database().reference()
let postDB = ref.child("Users")
postDB.queryOrdered(byChild: "Region").queryOrderedByKey().observeSingleEvent(of: .value) { (snapshot) in
let snapshotValue = snapshot.value as! [String:String]
let jobTitle = snapshotValue["Job Title"]!
let companyName = snapshotValue["Company Name"]!
let jobDesc = snapshotValue["Job Description"]!
let posted = post()
posted.jobTitle = jobTitle
posted.company = companyName
posted.jobDescription = jobDesc
self.jobsPosted.append(posted)
self.feedTable.reloadData()
}
}
The user should be able to post a job and other users should be able to view the jobs posted and also later edit and update it. Considering all these, What will be the solution ?
Will these be possible in firebase ?
Thanks in Advance!
Related
when i sign up a user in my ios app it generates a user id and adds that to the data base with the users name and surname and username but it is generating a user id and another random number/id and i dont know what that is for:
i dont know what the Roy... is and dont know where its coming from.
so when i try and access the users uid to access the information such as the name and surname i keep getting the following error because its using the wc7... number and not the other one:
Listener at /Users/wc7VyejKlDNfcAhFu3AkIX9Y9on1/Username failed: permission_denied
this is my code that i use to try and access the users information:
func fetchUsersData() {
guard let currentUser = Auth.auth().currentUser?.uid else { return }
print("Current user id is \(currentUser)")
Database.database().reference().child("Users").child(currentUser).child(USER_NAME).observeSingleEvent(of: .value) { (snapshot) in
guard let username = snapshot.value as? String else {return}
self.navigationItem.title = username
}
}
how do i fix this?
That code is for the Firebase Real Time Database and the screen shot is for Cloud Firestore. They are totally different and unrelated.
If you want to read the data shown in your screenshot you need to use the Cloud Firestore documentation.
The documentID 'Roy...' happens when you don't assign a document an ID... it will generate one automatically.
Also, change your Firestore structure to use the users uid as the documentID. So it would look like this
users //the collection
uid_0 //the document with documentID = a users uid
first_name: "Hank"
last_name: "Jones"
user_name: "Hankster"
uid_1
first_name: "Leroy"
last_name: "Jenkins"
user_name: "Leeeerrroooyyy"
and then the code to read a specific user name based on a uid is this
func readUserName() {
let users = self.db.collection("users")
let thisUser = users.document(the users uid)
thisUser.getDocument(completion: { documentSnapshot, error in
if let error = error {
print(error.localizedDescription)
return
}
guard let snap = documentSnapshot else { return }
let docId = snap.documentID
let userName = snap.get("user_name") as? String ?? "No Name"
print(userName)
})
}
Also note that you will need to be authenticated to Firestore to read any data or adjust the Security Rules to allow anyone to read. That's not generally a good idea but when you're just getting started it's ok.
issue : ( CB Lite 2.0 , Swift)
Registration screen which has name, email and dob and want to save in couchbase lite.
everytime user-filled form with these fields I want to store in local CB Lite DB
After that i want to fetch all record store in the cb lite.
Issue is :
Created a document
stored name , emal and dob in swift dictionary and tried to save and it stores but everytime i fetch it shows only one , not other user information.
Kinldy help me on this.
Raised Query on Couchbase Forum :
https://forums.couchbase.com/t/saving-offline-data-into-cb-lite-2-0/17877?u=st.shubh.tiwari
This is the way i called by taking one sample notification and checked its working :
let dict = [
"alert": "push notification.. (5)",
"badge": 1,
"sound": "default"
] as [String : Any]
var notificationArray = [Dictionary<String,Any>]()
let notiDict = CouchDBHelper.fetchDocumentByDocId(documentID: Constants.notificationDocument)
if let notiArray = notiDict["notification"] as? [Dictionary<String,Any>] {
notificationArray = notiArray
}
notificationArray.append(dict)
CCouchDBHelper.insertNotificationData(data: notificationArray, doc_id: Constants.notificationDocument)
objNotifcationSource = notificationArray
objNotificationTable.reloadData()
public func insertNotificationData(data:Any?,doc_id:String)
{
//let sharedInstance = CouchbaseAdapter.sharedInstance
let doc = MutableDocument(id: doc_id)
doc.setValue(data, forKey: "notification")
do {
try database.saveDocument(doc)
//try sharedInstance.database.saveDocument(doc)
print("Inserted Record :", data as! NSArray)
} catch let error as NSError {
print("Error in saving",error)
}
fetchDocumentByDocId(documentID: doc_id)
}
Step 1: Link (https://github.com/MailCore/MailCore2)
Step 2: I have added mailcore-framework in my project
Step 3: pod install for UICKeyChainStore in my project done
Step 4: Send mail successfully using MCOSMTPSession, MCOMessageBuilder.
Step 5: My problem is that I am not able to fetch using mailcore. Is there any other framework for fetching mail (inbox)?
Sorry for late answer. I have two apps in the App Store, both of them use MailCore2, so I can explain you a thing or two about that.
Of course you can fetch the emails with MailCore2, this is the code. If you have any other doubt with MailCore2 write about that, I will try to find the answer.
var imapsession:MCOIMAPSession = MCOIMAPSession()
func prepareImapSession()
{
// CONFIGURE THAT DEPENDING OF YOUR NEEDS
imapsession.hostname = imapHostname // String
imapsession.username = userName // String
imapsession.password = password // String
imapsession.port = portIMAP // UInt32 number
imapsession.authType = MCOAuthType.saslLogin
imapsession.connectionType = MCOConnectionType.TLS
}
func useImapWithUIDS()
{
// There is more than one option here, explore depending of your needs
let requestKind : MCOIMAPMessagesRequestKind = .headers
let folder : String = "INBOX"
// HERE ALSO EXPLORE DEPENDING OF YOUR NEEDS, RANGE IT IS THE RANGE OF THE UIDS THAT YOU WANT TO FETCH, I SUGGEST TO YOU TO CHANGE THE // NUMBER ONE IF YOU HAVE A LOWER BOUND TO FETCH EMAIL
let uids : MCOIndexSet = MCOIndexSet(range: MCORangeMake(1, UINT64_MAX))
let fetchOperation = imapsession.fetchMessagesOperation(withFolder: folder, requestKind: requestKind, uids: uids)
fetchOperation?.start
{ (err, msg, vanished) -> Void in
if (err != nil)
{
error = err
NSLog((err?.localizedDescription)!)
}
else
{
guard let msgs = msg as? [MCOIMAPMessage]
else
{
print("ERROR GETTING THE MAILS")
return
}
for i in 0..<msgs.count
{
// THE SUBJECT
let subject = msgs[i].header.subject
// THE uid for this email. The uid is unique for one email
let uid = msgs[i].uid
// The sequenceNumber like the nomber say it is the sequence for the emails in the INBOX from the first one // (sequenceNumber = 1) to the last one , it not represent always the same email. Because if you delete one email then //next one will get the sequence number of that email that was deleted
let sequenceNumber = msgs[i].sequenceNumber
}
}
}
// MARK: - EXTRACT THE CONTENT OF ONE EMAIL, IN THIS FUNCTION YOU NEED THE uid, THE UNIQUE NUMBER FOR ONE EMAIL
func useImapFetchContent(uidToFetch uid: UInt32)
{
let operation: MCOIMAPFetchContentOperation = imapsession.fetchMessageOperation(withFolder: "INBOX", uid: uid)
operation.start { (Error, data) in
if (Error != nil)
{
NSLog("ERROR")
return
}
let messageParser: MCOMessageParser = MCOMessageParser(data: data)
// IF YOU HAVE ATTACHMENTS USE THIS
let attachments = messageParser.attachments() as? [MCOAttachment]
// THEN YOU NEED THIS PROPERTIE, IN THIS EXAMPLE I TAKE THI FIRST, USE WHAT EVER YOU WANT
let attachData = attachments?.first?.data
// FOR THE MESSAGEPARSER YOU CAN EPLORE MORE THAN ONE OPTION TO OBTAIN THE TEXT
let msgPlainBody = messageParser.plainTextBodyRendering()
}
You can give https://github.com/snipsco/Postal a try. This is a framework which aims to provide simple access to common email providers.
I am trying to create a wall/timeline that shows posts from all the users that currentUser is following. All users that currentUser is following is showed under Users -> UserID -> Following. Whenever one of their followers is making a post it will be added under feed-items with an autoID - the key (the autoID) is added to currentUsers Users -> UserID -> Wall at the same time.
Here is an image of an example from my Firebase database:
Under Wall as you can see, one of this users followers has made a post (the whole post is saved under feed-items) and the autoID of that post has made it to the users Wall.
Now I am trying to figure out how to show all the posts in feed-items, based on the autoID's stored under currentUsers Wall.
I have tried the following code, but nothing shows and when it reaches this line print(self.updates.count) it is printing 0.
func startObersvingDB(userID: String) {
FIRDatabase.database().reference().child("Users").child(userID).child("Wall").observeEventType(.ChildAdded, withBlock: { snapshot in
if let posts = snapshot.value!["Post"] as? String {
self.postArray.append(posts)
for i in 0..<self.postArray.count {
let post = self.postArray[i]
print(post)
FIRDatabase.database().reference().child("feed-items").queryEqualToValue(post).observeEventType(.Value, withBlock: { (snapshot: FIRDataSnapshot) in
var newUpdates = [Sweet]()
for update in snapshot.children {
let updateObject = Sweet(snapshot: update as! FIRDataSnapshot)
newUpdates.append(updateObject)
}
self.updates = newUpdates.reverse()
print(self.updates.count)
self.tableView.reloadData()
}) { (error: NSError) in
print(error.description)
}
}
}
})
}
If I am guessing right, your structure for feed-items is something like this.
feed-items
-UniquePostID
-Post Data (key-value pair(s))
If this is the case then to retrieve data for a post use .child(post) instead of .queryEqualToValue(post). Also since this will return DataSnapshot for single post you can directly create your Sweet object and append it in existing updates array.
One more thing I don't think you need to iterate entire postArray each time a new post is added. You should retrieve data for new post only.
Hope this helps!!
I am making a chat Application in ios through parse server. I have made a MessageRoom collection which has many to many relationship with users through PFRelation. Now i am struck . Whenever a user starts a new conversation , I add new entry in MessageRoom collection and use its id in the messages of that group. But when i want to fetch a previous conversation , let say a conversation between 5 users , how will i query the messageRoom which has exactly the same 5 users (not more or less) in its relation ?
This is the code i am using to create or get Message Room . It is not working correctly. What it does is instead of making a new messageRoom first time and fetching the same for latter user , it makes a new messaga room every time.
class func createOrGetMessageRoom(users:[PFUser], description:String)->PFObject{
var returnMessageRoom:PFObject = PFObject(className: PF_MESSAGE_ROOM_CLASS_NAME);
let users = users.sort(increasingIDs)
let query:PFQuery = PFQuery(className: PF_MESSAGE_ROOM_CLASS_NAME)
query.whereKey(PF_MESSAGE_ROOM_USERS, containsAllObjectsInArray : users)
query.findObjectsInBackgroundWithBlock{(objects, error )->Void in
if error == nil {
if objects?.count == 0 {
let messageRoom = PFObject(className: PF_MESSAGE_ROOM_CLASS_NAME)
messageRoom[PF_MESSAGE_ROOM_DESCRIPTION] = description
messageRoom[PF_MESSAGE_ROOM_LAST_USER] = PFUser.currentUser()
messageRoom[PF_MESSAGE_ROOM_LAST_MESSAGE] = ""
messageRoom[PF_MESSAGE_ROOM_COUNTER] = 0
messageRoom[PF_MESSAGE_ROOM_UPDATE_TIME] = NSDate()
let messageUsers = messageRoom.relationForKey(PF_MESSAGE_ROOM_USERS)
for user in users {
messageUsers.addObject(user)
}
messageRoom.saveInBackgroundWithBlock{(success,error)->Void in
if error == nil {
returnMessageRoom = messageRoom
}
}
}else{
returnMessageRoom = objects![0]
}
}else{
print("Message.createMessage Erorr");
print(error)
}
}
return returnMessageRoom
}
class func increasingIDs(user1: PFUser, user2: PFUser) -> Bool {
return user1.objectId < user2.objectId
}
I have also checked this application . What it does is whenever it starts a new chat , it concatenates objectIds of users in ascending order and use it as a groupId which is used for future references and used in chat messages as a foreign key.
It'll work in private chat and in group chat , but what happens if a user has started a group chat , and wants to add new users to this chat ?? If we simple change the group id by concatenating this users id , the previous messages which have used the old group id will no longer appear in this message group.
Also tell me if this approach of making groupID through concatenation is better or many to many relationship is better?
One problem with your function createOrGetMessageRoom is that findObjectsInBackgroundWithBlock is asynchronous, and you're not taking that into account.
What this means is that the findObjectsInBackgroundWithBlock function gets a response a long time after createOrGetMessageRoom has returned.
So, the PFObject you create on the first line of your function is always returned - your function does not wait for findObjectsInBackgroundWithBlock to return a MessageRoom.
To fix this, make your code take a callback like this:
class func createOrGetMessageRoom(users:[PFUser], description:String, callback: (PFObject? -> Void)) {
let users = users.sort(increasingIDs)
let query:PFQuery = PFQuery(className: PF_MESSAGE_ROOM_CLASS_NAME)
query.whereKey(PF_MESSAGE_ROOM_USERS, containsAllObjectsInArray : users)
query.findObjectsInBackgroundWithBlock{(objects, error )->Void in
if error == nil {
if objects?.count == 0 {
let messageRoom = PFObject(className: PF_MESSAGE_ROOM_CLASS_NAME)
messageRoom[PF_MESSAGE_ROOM_DESCRIPTION] = description
messageRoom[PF_MESSAGE_ROOM_LAST_USER] = PFUser.currentUser()
messageRoom[PF_MESSAGE_ROOM_LAST_MESSAGE] = ""
messageRoom[PF_MESSAGE_ROOM_COUNTER] = 0
messageRoom[PF_MESSAGE_ROOM_UPDATE_TIME] = NSDate()
let messageUsers = messageRoom.relationForKey(PF_MESSAGE_ROOM_USERS)
for user in users {
messageUsers.addObject(user)
}
messageRoom.saveInBackgroundWithBlock{(success,error)->Void in
if error == nil {
callback(messageRoom)
}
callback(nil)
}
}else{
callback(objects![0])
}
}else{
print("Message.createMessage Erorr");
print(error)
callback(nil)
}
}
}
Usage:
YourClass.createOrGetMessageRoom([], description: "description") { messageRoom in
// Do something...
}
The db schema in my mind, you should have 3 collections, _User, MessageRoom, and Message.
MessageRoom: users, roomName and other infos.
Message: room(pointer of MessageRoom), msg(content), sender(pointer of _User)
below are pseudo code
In your app, query all current user involved messageRooms.
var query = new Parse.Query("MessageRoom")
query.equalTo("users", currentUser);
//other constraint, roomName, createdAt, limit ...
query.find(...)
Pick a messageRoom object, and then use it to getMessages.
var query2 = new Parse.Query("Message");
query2.eqaulTo("room", roomObj);
query2.include("sender");
query2.descending("createdAt");
query2.find(...)