Sorting tableView data by timestamp with firebase - swift

Question

I'm looking to sort the data / arrays in my tableView by which date it was created. I don't have any code to support this but I have the code for the cells and images from the database.
Database.database().reference().child("Projects").observe(.childAdded, with: { (snapshot) in
if let dictionary = snapshot.value as? [String : AnyObject]
{
let project = Project(dictionary: dictionary)
self.ProjectsArray.append(project)
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
else
{
print("fucked ")
}
self.FilterdProjectsArray = self.ProjectsArray
}, withCancel: nil)
Database

Answer 1

You just need to add one line:
self.ProjectsArray.append(project)
self.ProjectsArray = self.ProjectsArray.sorted { (lhs, rhs) in lhs.timestamp < timestamp }
where date is the name of the date property on your Project object
Update
You could extend Optional to conform to Comparable, but a simpler way to handle it might be:
self.ProjectsArray = self.ProjectsArray.sorted { (lhs, rhs) in
let lTimestamp = lhs.timestamp ?? NSNumber(integerLiteral: 0)
let rTimestamp = rhs.timestamp ?? NSNumber(integerLiteral: 0)
return lTimestamp < rTimestamp
}
Update 2
Turns out that NSNumbers aren't comparable. Looks like you'll need to use Int or Double, whichever makes more sense for your data (are you using whole or floating-point numbers?
self.ProjectsArray = self.ProjectsArray.sorted { (lhs: Project, rhs: Project) in
let lTimestamp: Int
if let lNum = lhs.timestamp {
lTimestamp = Int(lNum)
} else {
lTimestamp = 0
}
let rTimestamp: Int
if let rNum = rhs.timestamp {
rTimestamp = Int(rNum)
} else {
rTimestamp = 0
}
return lTimestamp < rTimestamp
}