See also questions close to this topic

• Firebase: How to design chat app schema on Firebase so that number of updates on every message sent is less?

  I have already seen a lot of questions and answers on StackOverflow about the schema for chat app but they don't seem to be covering all the needs of a basic chat app.

  This is the flow of the app.

  • The user opens the app
  • Show list of chats he has with last message and last message timestamp of all the chats(This has to be synced. If someone sends him a message when he is looking at this screen that chat should appear on this screen)
  • The user will click on any of the chats and messages from that particular chats opens up.
  • He can type text in the textbox and click send

  This is how I designed schema to support the above requirements.

  

  chats stores info about the last message sent for every chat id.(chat id is formed by combining id's of two users in ascending order.)

  messages contains an array of messages for every chat id.

  user_chats contains a list of chat for every user.

  This how I create user's home screen:-

  • As soon as the user opens the app I get the list of his chat id from user_chats path(I subscribe to user_chats/uid to get realtime updates).
  • I get info about all the chat id from chats table

  As soon as the user clicks on a particular chat, I open message screen where I subscribe to messages/chat_id path and show messages.

  Things become daunting when a user sends a message.

  • Add chat id (Ex: uid1_uid2) to the both user_chats/uid1 and user_chats/uid2 paths
  • Push message to /messages/uid1_uid2/
  • Update /chats/uid1_uid2/

  Even though everywhere firebase experts say that updates happen in single connection still it is scaring me to do four updates for a single message.

  How can I improve my schema so that I can minimize updates?

  Please let me know if something is not clear.
• Firebase Functions - Getting value from invalid reference not caught

  I have two references like:

    var receiverMaleRef = admin.database().ref(`root/users/male/${currentUser}`);
    var receiverFemaleRef = admin.database().ref(`root/users/female/${currentUser}`);
  

  'currentUser' is unique overall i.e same name cannot exists on both nodes.

  And I am using following code to get values:

  return receiverMaleRef.once('value').then(function(maleDataSnapshot) { 
  
  })
  .catch(err => {
  
     //if currentUser is not male catch should be called because of invalid reference
     //Get value from female node   
     return receiverFemaleRef.once('value').then(function(dataSnapshot) { 
  
     })
  
  });
  

  The problem I am facing is if 'currentUser' is female it does not catches the error, instead it returns null in maleDataSnapshot.

  What should be the workaround this issue?
• How to convert timeStamp value wrapped in an optional into a double?

  I currently have a function which fetches images from firebase based on some preliminary info, at the same tree level as the images is a time stamp value (for each image). I have been unable to get the value, only being able to get to Optional(123131.432432) which is not what I need of course. Below is the function:

      func fetchAllPostImages() {
      print("fetchAllPostImages function")
      self.ref.child("Posts").child(self.userID).child(self.postNum).child("Images").observe(.childAdded, with: { snapshot in
          var snapshotUrl = snapshot.childSnapshot(forPath: "ImageUrl")
          var timeStampData = snapshot.childSnapshot(forPath: "timeStamp").value
  
          print("fhdsjaklhfkjdsfksahdjksfjlashfkljdhs")
          print(snapshot.childSnapshot(forPath: "ImageUrl"))
          print(snapshot.childSnapshot(forPath: "timeStamp").value, "timestamp123")
          print(snapshotUrl.value as? [String: String], "value")
  
              if let urlValue = snapshotUrl.value {
                  print("jkdhsjbbvcbcbcbccbbbbbbbbbbbbbbb")
                  let snapShotValue = [ "ImageUrl" : urlValue]
                  let timeStampVal = ["timeStamp" : timeStampData]
  
                  print(timeStampVal, "dsfaf")
                  for (_, value) in snapShotValue {
  
                      if let imageURL = URL(string: value as! String) {
                          print(imageURL, "image url here")
                          do {
                              let imageAsData = try Data(contentsOf: imageURL)
                              let image = UIImage(data: imageAsData)
                              var timeStamp = 0.0
                              self.arrayOfImgObj.append(Media(image: image!, timeStamp: timeStamp))
                              self.tableView.reloadData()
                              print(self.arrayOfImgObj.count, "array.count")
                          } catch {
                              print("imageURL was not able to be converted into data")
                          }
                      }
                  }
          }
      })
  }
  

  So I was able to do the following and this seems to work however in the tableView I see teh same Optional(5421432.43214) as before. Even though when I print it it comes out as teh double value I needed.

                      for (value, timeValue) in zip(snapShotValue.values, timeStampVal) {
  
                      if let imageURL = URL(string: value as! String) {
                          print(imageURL, "image url here")
                          do {
                              let imageAsData = try Data(contentsOf: imageURL)
                              let image = UIImage(data: imageAsData)
                              var timeStampValue = timeValue as! Double
                              print(timeStampValue, "fgsdfg")
                              let timeStamp: Double = timeStampValue
                              self.arrayOfImgObj.append(Media(image: image!, timeStamp: timeStamp))
                              self.tableView.reloadData()
                              print(self.arrayOfImgObj.count, "array.count")
                          } catch {
                              print("imageURL was not able to be converted into data")
                          }
                      }
                  }
  
• How To Host An Image With Firebase Hosting?

  Issue

  How do I host an image file with Firebase hosting?

  I'm currently going through the steps in Firebase In App Messaging to setup messages to show to the user within the app. When asked to provide an Image URL for the message the UI suggests using Firebase hosting. I have followed the setup instructions and have successfully hosted my first site.

  I cannot find documentation regarding hosting an image resources such as a png file that can route to a specific URL.

  

  Setup

  Hosting Configuration

  

  Hosting Success

  
• Firebase Hosting allow x-frame-option for all domains (CROSS DOMAIN)

  How to configure the X-Frame-Options that allow all the domains can use iframe to my firebase hosted website?

  I configured the Firebase Hosting Headers:

  "headers":[
     {
       "source":"**/*",
       "headers":[
         {
           "key":"X-Frame-Options",
           "value":"ALLOW-FROM http://localhost:4200/"
         }
       ]
     }
   ]
  

  But it keep prompt me the error:

  Invalid 'X-Frame-Options' header encountered when loading 'https://cross-domain-services.firebaseapp.com/auth': 'ALLOW-FROM http://localhost:4200/' is not a recognized directive. The header will be ignored.
  

  This is my link: https://cross-domain-services.firebaseapp.com/auth

  Feel free to test it.

  Please advise.
• Firebase Hosting says, "Needs Setup"

  I’m having the same issue as described in Firebase hosting: Needs Setup

  I have a project hosted on firebase and DNS set up via Cloudflare. The domain resolves properly and browsers show the certificates are valid and the connection is secure etc. but, firebase shows status as, “Needs setup”.

  I have followed the “Advanced” setup (as described in the URL above) setting both A records and a “.well-known/acme-challenge/[generated filename]” file in place. SSL zone on Cloudflare is set to “Full”. I also set a CNAME record to the Firebase URL as another post suggested. (I did each step over time to try to see which if any fixed the issue or made it worse giving at least 12 hours between.)

  Everything seems to work, but firebase still says setup is still required which is ok I guess, but I'm curious about the cause.
• Removing gh-pages custom domain

  I have a gh-pages hosted site using a custom domain and now want to remove it. I have removed the gh-pages branch from github, removed the CNAME, removed the homepage in package.json and even removed the @ records pointing to github's ip addresses in the godaddy admin panel but for some reason the site is still up 😕. I am super confused as to why this is still being hosted... is it some kind of cache thing that will expire over time...? Any help would be greatly appreciated!!

  • dns provided by godaddy
  • is a create react app
• Converting Google Cloud Storage domain to Firebase

  I recently had my domain linked to a Google Cloud Storage bucket, but then realized that I had to switch it over to Firebase in order to host it over https. I proceeded to delete the bucket that it was currently in and then deploy my app using the firebase-cli. The original link that they gave me works.

  https://lavishweb-94938.firebaseapp.com/#/

  but the custom domain links appear to be pointing to an empty bucket. I'm assuming because I have to delete the old A record?

  Does anyone know if this is the intended behavior(until I get my cert provisioned) or if I should try to access the DNS records and remove the old a record?

  Here is the link that I'm trying to use.

  https://www.lavishweb.com/
• Can't pull origin on github desktop since I added cutom domain

  I added a custom domain to my GitHub Pages main repo and the last commit that has gone through since then is just the "changed CNAME". Now, when I click "pull origin" on GitHub Desktop, nothing happens--it's just unresponsive--I don't get an error message or anything. GH Desktop allows me to commit my changes remotely but I can't push them to actually show up on the browser. When I do command+P it just prompts me to publish my repository which is already published to my username.github.io repo. Do I need to update my repo name to my new CNAME somewhere? Help sorry I am new to all of this