I'm trying to populate a collection view with data from a Firebase Database. I'm making following call in my viewdidload function:
ref = FIRDatabase.database().reference(withPath: "Profiles")
handle = ref.queryOrdered(byChild: title!).observe(.value, with: { snapshot in
var items: [Profiles] = []
if snapshot.value is NSNull {
print("NIL!!")
} else {
for item in snapshot.children {
let profile = Profiles(snapshot: item as! FIRDataSnapshot)
items.append(profile)
}
self.profiles = items
self.collectionView?.reloadData()
}
}) { (error) in
print(error.localizedDescription)
}
I'm getting the following error:
fatal error: unexpectedly found nil while unwrapping an Optional value
and the compiler highlights the following piece of code:
handle = ref.queryOrdered(byChild: title!).observe(.value, with: { snapshot in
I'm not understanding what the issue is, and dont understand how to fix it?!
It sounds like you're confusing the UIViewController's title member with the Firebase child you're using the query for. If you have a child named title in your data structure and want to query based on that, just replace your query statement with this:
ref.queryOrdered(byChild: "title").observe(.value, with: { snapshot in
// your code
})
The only way you'd get the error you're getting is if the variable you're using (title) has nil.
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