Hello, I am attempting to implement a simple button that loads persistent data from a class (see below).
Button("Reload Data") {
while tableData2.isEmpty == false{
tableData2.remove(at: 0)
}
while tableView.isEmpty == false{
tableView.remove(at: 0)
}
//update
if csvData.isEmpty == false{
for superRow in csvData[0].tableData2{
tableData2.append(superRow)
}
for supperRow in csvData[0].tableView{
tableView.append(supperRow)
}
print("Item at 0: \(csvData[0].tableData2[[0][0]])")
print("\(tableData2[0][0])")
} else {
print("csvData is empty")
}
}
This button DOES work to appropriately print the data stored at the printed location once loaded in initially. The problem is that it doesn’t work across app restarts, which is the whole point of the button. Below I will include the rest of the relevant code with notes:
In contentView declaring the persistant variables:
Query private var csvData: [csvDataPersist]
Environment(\.modelContext) private var modelContext
The simple class of data I’m storing/pulling to/from:
@Model
class csvDataPersist{
var tableView: [[String]] = []
var tableData2: [[String]] = []
init(tableView: [[String]], tableData2: [[String]]) {
self.tableView = tableView
self.tableData2 = tableData2
}
}
In (appname)App: I tried both locations of the model container but it didn’t seem to matter
var body: some Scene {
WindowGroup {
ContentView()
.modelContainer(for: csvDataPersist.self)
}
//.modelContainer(for: csvDataPersist.self)
.modelContainer(sharedModelContainer)
}
How I’m attempting to save the data:
let newCSVDataPersist = csvDataPersist(tableView: tableView, tableData2: tableData2)
//modelContext.rollback()
//for superrow in csvData.count{
// csvData[superrow].tableData2.removeAll()
//}
//modelContext.rollback()
//csvData[0].tableData2.removeAll()
//csvData[0].tableView.removeAll()
if csvData.isEmpty == false {
print("not empty, deleting prev data")
modelContext.delete(csvData[0])
} else {
print("it empty, load data.")
}
modelContext.insert(newCSVDataPersist)
//try modelContext.save()
Note that I’ve tried just about every combination of enabling and disabling the commented out lines. This is the part of the code I am the least confident in, but after trying for hours to troubleshoot on my own I would appreciate any input from the community.
Something else that may be of note, in a previous attempt, upon a second startup, the terminal would print:
"coredata: error: error: persistent history (random number) has to be truncated due to the following entities being removed: ( csvdatapersist )"
Why is csvDataPersist getting removed? What is it getting removed by? Looking up this error was fruitless. Most sites instructed me to basically hard reset my simulators, clean the build, restart my computer, and try again. I've done all of these things about a hundred times at this point, with no results.
Any help would be much appreciated!
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