I am trying to create a unique identifier for a document in a Firestore database. This id is a session ID that needs to be unique, locally generated and not loads of characters long (like the automatically generated one). I am trying to write code that checks to see if the document with that ID already exists. If it does not then set the SessionID, if it does exist then randomly generate another ID and perform the check again. This should loop continue until no document exists with that ID and then the session can initialize. The issue is that I can't put this in a while loop as Firebase connectivity cannot handle this. Does anyone have any suggestions, or another way to achieve the same thing? Thank you in advance.
func setsessionid () {
sessionid = randomAlphaNumericString(length: 6)
let docRef = self.db.collection("strokedata").document(self.sessionid!)
docRef.getDocument { (document, error) in
if let document = document, document.exists {
} else {
let currentsession = self.sessionid!
self.sessionID.text = "SESSION ID: \(currentsession)"
let user = Auth.auth().currentUser
if let user = user {
self.userid = user.uid
}
print("Document does not exist")
}
}
Related
I need to get ID of document in Reservations collection. I don't know ho to do that. When I want to overwrite data in specific Reservation it can't because I don't have ID of the reservation. I am putting their UID of user that is wrong.
guard let uid = Auth.auth().currentUser?.uid else { return }
let userCollection = Firestore.firestore().collection("Users")
let thisUserDoc = userCollection.document(uid)
let snapshot = thisUserDoc.collection("Reservations").document(uid).updateData(data) { err in
if let err = err {
print("Error updating document: \(err) ")
}
else {
print("Document successfully updated")
}
}
Error message - wrong path
Database scructure
As shown in your code and in the error shared in your question you use the same document ID for the doc in the users collection and for the doc in the Reservations (sub)collection. The database screenshot shows that it cannot work: there isn’t any doc corresponding to this case.
You need to use an existing ID for the doc in the Reservations (sub)collection.
If you don’t know the desired ID you can maybe build a query based on some specific field(s) of the doc.
I would like to receive a bool letting me know if my document has a Wasiyyah or not..
What I've tried:
Firestore.firestore().collection(user!.uid).document(docID).value(forKey: "Wasiyyah")
Which only crashes every time, so there must be something I'm not understanding here.
There isn't any function to check if a field exists in a document. You'll have to fetch the document and check for it's existence:
let docRef = Firestore.firestore().collection(user!.uid).document(docID)
docRef.getDocument { (document, error) in
if let document = document, document.exists {
let data = document.data()
// Check if the field exists in data
} else {
print("Document does not exist")
}
}
Currently my Firebase database is using the following structure
Users
User 1 Data
User 2 Data...
However I have created a new collection inside of the "users" collection called "products" which will store product details that users have uploaded on the application.
How can I ensure that once a user uploads a new product, it is only uploaded into their 'User X data' dataset, inside the respective "products" collection. The code I currently have only uploads the data into the "users" collection, with no reference of the users who added the product as required. I have shown the structure of my Firebase database below for reference.
Here is my code:
let user = Auth.auth().currentUser
db.collection("users").getDocuments { (snapshot, error) in
if let error = error {
print(error)
return
} else {
for document in snapshot!.documents {
let data = document.data()
let userId = data["uid"] as! String
if userId == user?.uid {
db.collection("users").document("products").setData(["productNameField":firstName, "productURLField":lastName,"productPriceField":ebayName, "productDescriptionField":etsyName, "productTimeRemainingField":email])
}
}
}
}
How would I go about updating my code to achieve this?
I think you're looking for
let user = Auth.auth().currentUser
db.collection("users").getDocuments { (snapshot, error) in
if let error = error {
print(error)
return
} else {
for document in snapshot!.documents {
let data = document.data()
let userId = data["uid"] as! String
if userId == user?.uid {
document.reference.collection("products").addDocument(["productNameField":firstName, "productURLField":lastName,"productPriceField":ebayName, "productDescriptionField":etsyName, "productTimeRemainingField":email])
}
}
}
}
So here document is the DocumentSnapshot that you're looping over, so document.reference gives you the reference to that specific document, and document.reference.collection("products") then points to the `products subcollection for that specific document.
You're wastefully looping over the entire list of users to FIND the user document needed. Simplify, simplify - use the user.uid as the Id of the user document!! (i.e. when you create the user document, save it as
db.collection("users").doc(user.uid).set({whatever})
...then it's trivial to access as...
let user = Auth.auth().currentUser
db
.collection("users")
.doc(user.uid)
.collection("products")
.setData([
"productNameField":firstName,
"productURLField":lastName,
"productPriceField":ebayName,
"productDescriptionField":etsyName,
"productTimeRemainingField":email
]);
If there is another reason to keep the docID and the uid separate (not shown here), then use a query to get the SPECIFIC document with the uid, rather than downloading ALL of them
let user = Auth.auth().currentUser
db
.collection("users")
.where(field: "uid", opStr:"==", value: user.uid)
.getDocuments( { (snapshot, error) in
if let error = error {
print(error)
return
} else { //the query should only return the one document, but queries always return an array
snapshot
.documents[0]
.ref()
.document("products")
.setData([
"productNameField":firstName,
"productURLField":lastName,
"productPriceField":ebayName,
"productDescriptionField":etsyName,
"productTimeRemainingField":email
])
}
}
...etc...
I don't generally use Swift, so the where clause may require different formatting, but the idea is GET ONLY THE DOCUMENT YOU NEED. Your security rules should only be allowing this, anyway.
Initially I created a collection Users in my Firestore Cloud database with a subcollection Wishlist.
To add to the wishlist, I hardcoded the following to test it works:
let db = Firestore.firestore()
db.collection("users/JldiJEK5i84DZWhlTFg6/wishlist").addDocument(data: ["plant" : plants[0], "image" : plants[1]])
}
Once button is tapped, the plant is sent to that particular User's wishlist and it works -- I can see this being added to the database.
How do I...
I cannot figure out in the documentation how not to hardcode the document id. I would like it to just add the plant for every user signed in?
Get the current user:
let user = Auth.auth.currentUser
if let user = user {
_ = user.id
}
Then:
let db = Firestore.firestore()
db.collection("users/\(user?.uid ?? "error")").addDocument(data: ["plant" : plants[0], "image" : plants[1]])
This works for me when dealing with people/customers, I just have an error document in Firestore, but your user is more than likely never going to be nil if they log in or create an account.
Edit:
Just to be safe, this is probably better and will avoid unnecessary writes to Firestore when there's an error (saving money)
guard let currentUser = Auth.auth().currentUser {
print("handle the error")
return
}
let uid = currentUser.uid
...
#IBAction func NextButtonTapped(_ sender: Any) {
//validate the fileds
let Error = validateFields()
if Error != nil {
// there is somthing wrong with the fields show error message
showError(Error!)
}
else {
// create cleaned versions of the data
let Password = PasswordTextField.text!.trimmingCharacters(in:
.whitespacesAndNewlines)
let Email = EmailTextField.text!.trimmingCharacters(in:
.whitespacesAndNewlines)
let Firstname = FirstnameTextField.text!.trimmingCharacters(in:
.whitespacesAndNewlines)
let Lastname = LastnameTextField.text!.trimmingCharacters(in:
.whitespacesAndNewlines)
let Age = AgeTextField.text!.trimmingCharacters(in:
.whitespacesAndNewlines)
// create the user
Auth.auth().createUser(withEmail: Email, password: Password) {
(results, Err) in
// check for errors
if Err != nil {
// there was an error creating the user
self.showError("Error creating user")
}
else {
// user was created succesfully store user info
let db = Firestore.firestore()
db.collection("users").document(results!.user.uid).setData(["first
name":Firstname, "last name":Lastname, "age":Age,
"uid":results!.user.uid]) { (Error) in
if Error != nil {
// show error message
self.showError("error saving user data")
}
}
//transition to the home screen
self.transitionToHome()
}
}
}
}
So basically here I am authenticating the user on firebase. (I made
the document ID = the user ID) then I am entering the users info
into the firebase database into a document where its ID is also
equal to the users ID from when they are authenticated. Now what I
am trying to do is to create or get a reference to the document ID
where some of the users info is already stored like name, last name,
age... so I can later add/merge more info into that same document
the name, last name and age is stored under. This is how I am trying
to merge the info together in a diffrent view controller
db.collection("users").document(*******).setData(["middle
Name":Middlename, "favourite colour":Favouritecolour], merge: true)
{ (Error) in
if Error != nil {
// show error messgae
self.showError("error saving user data")
}
}
Where I put "*******" is where I am supposed to reference the
document ID so I can merge/add this info into the same document as
the other users information where the name, last name and age is
stored.
The code I showed you and asked about earlier on how to get a
document ID from, was code I found on stack overflow where they guy
had a similar problem as mine. He was trying to access something out
of his document but I am just trying to create a reference to the
document ID.
The code form earlier:
func getDocument() {
//get specific document from current user
let docRef =
Firestore.firestore().collection("users").document(Auth.auth().currentUs er?.uid ?? "")
//get data
docRef.getDocument { (document, Error) in
if let document = document, document.exists {
let dataDescription = document.data()
print(dataDescription?["uid"])
} else {
print("Document does not exist")
}
}
}
But I don't know if this code will help me, I just thought it might
because its also accessing the document, thats why I though it might
be my answer to getting the document ID.
So basically my question is what do I need to do wether its adding
to the code I found on this site, or if I have to write my own code,
so I can get a reference to the Document ID where my name, last name
and Age is stored, so I can merge more Info into that document
Thank You Very Much!!!
To print the document ID do something like this:
let docRef = Firestore.firestore().collection("users").document(Auth.auth().currentUser?.uid ?? "")
// Get data
docRef.getDocument { (document, error) in
if let document = document, document.exists {
let dataDescription = document.data()
print(dataDescription?["firstname"])
print(document.documentID)
} else {
print("Document does not exist")
}
}
I highly recommend spending some time in the Firestore documentation, as this is covered in there under getting multiple documents from a collection