I am trying to decode data from a Firebase DataSnapshot so that it can be decoded using JSONDecoder.
I can decode this data fine when I use a URL to access it with a network request (obtaining a Data object).
However, I want to use the Firebase API to directly obtain the data, using observeSingleEvent as described on this page.
But, when I do this, I cannot seem to convert the result into a Data object, which I need to use JSONDecoder.
Is it possible to do the new style of JSON decoding with a DataSnapshot? How is it possible? I can't seem to figure it out.
Cloud Firestore also features richer, faster queries and scales further than the Realtime Database.
Firebase uses NoSQL; MySQL uses SQL.
The limit you're referring to is the limit for the number of concurrently connected users to Firebase Realtime Database on the free Spark plan. Once you upgrade to a payment plan, your project will allow 200,000 simultaneously connected users.
You can use both Firebase Realtime Database and Cloud Firestore in your app, and leverage each database solution's benefits to fit your needs. For example, you might want to leverage Realtime Database's support for presence, as outlined in Build Presence in Cloud Firestore.
I have created a library called CodableFirebase that provides Encoders
and Decoders
that are designed specifically for Firebase.
So for the example above:
import Firebase
import CodableFirebase
let item: GroceryItem = // here you will create an instance of GroceryItem
let data = try! FirebaseEncoder().encode(item)
Database.database().reference().child("pathToGraceryItem").setValue(data)
And here's how you will read the same data:
Database.database().reference().child("pathToGraceryItem").observeSingleEvent(of: .value, with: { (snapshot) in
guard let value = snapshot.value else { return }
do {
let item = try FirebaseDecoder().decode(GroceryItem.self, from: value)
print(item)
} catch let error {
print(error)
}
})
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