Using Firebase Storage for Uploading Images - swift

Question

I can only upload a single photo to FirebaseStorage.
All the tutorials I have seen on youtube use FirebaseStorage to save user's profile pictures. However, I am trying to make a restaurant app where I should be able to keep several pictures and not only one. My code right now only allows me to keep one. As soon as I try to upload a second image, it erases the first one.
Here's my code:
#IBAction func agregarComidaFav(_ sender: Any) {
guard let imageData = imagen?.jpegData(compressionQuality: 0.4) else {
return
}
let storageRef = Storage.storage().reference(forURL: "gs://comidas-68043.appspot.com")
let storageProfileRef = storageRef.child("ComidasFavoritas")
let metadata = StorageMetadata()
metadata.contentType = "image/png"
storageRef.child("comidasFavoritas/png").putData(imageData, metadata: metadata) { (storageMetaData, error) in
if error != nil {
print(error?.localizedDescription ?? "")
return
}
}
storageProfileRef.downloadURL(completion: { (url, error) in
if let metaImageUrl = url?.absoluteString {
print(metaImageUrl)
self.imagenURL = metaImageUrl
}
})
var ref: DocumentReference? = nil
ref = db.collection("comidasFavoritas").addDocument(data: [
"imagenURL" : imagenURL
]) { err in
if let err = err {
print("Error agregando comida: \(err)")
} else {
let id = ref!.documentID
print("Comida agregado con ID: \(id)")
}
}
}

Answer 1

This line:
storageRef.child("comidasFavoritas/png").putData(...)
...guarantees that each time, the data is going to be written to "comidasFavoritas/png"
I don't know anything about how you're keeping track of your data/images in your app, but you'll probably need some way to keep track of an ID for that image. Then, when you store it, you could store it like:
storageRef.child("comidasFavoritas/png\(imageId)").putData(...)
You'd probably also want to store that ID in your database when you store the image URL.