Swift Realm [[String]] object

Question

I'm new to Realm and have been through the documentation a few times. I need to persist a [[String]] and have not found a way to do it yet

 var tableViewArray = [[String]]()

I see the documentation pointing to Lists but I've been unsuccessful at implementing them. I'm showing my whole process here but just need help persisting my var tableViewArray = [[String]]()in Realm

This is my class

class TableViewArrays {

var tableViewArray = [[String]]()  // populates the Main Tableview

/// add picker selection to tableview array
func appendTableViewArray(title: String, detail: String, icon: String ) {

        var newRow = [String]()
        newRow.append(title)
        newRow.append(detail)
        newRow.append(icon)
        tableViewArray.append(newRow)
}

In the View Controller I instantiate the object

var tableViewArrays = TableViewArrays()

Then call the class function to populate the object

var tableViewArrays.appendTableViewArray(title: String, detail: String, icon: String )

Thank you for taking a look

Can you post the code where the Realm object you're persisting is declared? — Faris Sbahi
– Faris Sbahi, Commented Feb 13, 2017 at 0:00
˚Sorry -- have trouble adding code blocks -- class TableViewRow: Object { dynamic var icon = "" dynamic var title = "" dynamic var detail = "" override var description: String { return "TableViewRow {(icon), (title), (detail)}" } } class EventTableView: Object { let rows = List<TableViewRow>() //override var description: String { return "Car {(brand), (name), (year)}" } } — Westsider
– Westsider, Commented Feb 13, 2017 at 0:10

TiM · Accepted Answer · 2017-02-13 18:30:09Z

2

I would make two Realm objects to be persisted, then nest them. Here's an example:

class RealmString: Object {
    dynamic var value = ""
}

class RealmStringArray: Object {
    let strings = List<RealmString>()
}

class TableViewArray{
    let stringArrays = List<RealmStringArray>()
}

I can't say much about the efficiency of this method, but I suppose it should work for your purpose. Also, if you have a large amount of data, it may become a pain to persist each individual string, then string collection, the string collection collection.

edited Feb 13, 2017 at 18:30

TiM

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answered Feb 13, 2017 at 0:08

Faris Sbahi

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3 Comments

Westsider Over a year ago

Thanks Faris, nice solution and I appreciate the help!

TiM Over a year ago

This is the recommended way to do it for now. Storing arrays of primitives is on the roadmap for Realm (github.com/realm/realm-cocoa/issues/1120), so hopefully this will be a better experience in future. :)

Faris Sbahi Over a year ago

Feel free to mark a solution you're satisfied with as correct! @user6530825

Westsider · Accepted Answer · 2017-02-13 00:24:52Z

1

create the classes

class TableViewRow: Object {
    dynamic var icon = ""
    dynamic var title = ""
    dynamic var detail =  ""

    override var description: String { 
    return "TableViewRow {\(icon), \(title), \(detail)}" }
}

class EventTableView: Object {
    let rows = List<TableViewRow>()
}

then instantiate the objects and append

let defaultTableview = EventTableView()
let rowOne = TableViewRow()

rowOne.icon = "man icon" ; rowOne.title = "War Hans D.O.P." ; rowOne.detail = "Camera Order Nike 2/11/17"

defaultTableview.rows.append(objectsIn: [rowOne])

answered Feb 13, 2017 at 0:24

Westsider

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