How to cast JSON array to array with SwiftyJSON

Question

I have a JSON array var array: [JSON] = [] that I would like to cast as a 'regular' array so that I can perform some filtering and other data manipulation. What would be the suggested approach to do so?

I've tried let filteredArray = array.arrayValue.filter {$0["submission_id"] as! Int == 27} but I was thrown this error

Value of type '[JSON]' has no member 'arrayValue'

If the type is [JSON] then that is already a "regular array". array.filter should work. — Thilo
– Thilo, Commented Jun 2, 2016 at 5:15
I've tried that too but I would get a Cast from 'JSON' to unrelated type 'Int' always fails — noobdev
– noobdev, Commented Jun 2, 2016 at 5:17
$0["submission_id"].double should give you a double, that's close ... — Thilo
– Thilo, Commented Jun 2, 2016 at 5:20

Eric Aya · Accepted Answer · 2016-06-02 15:20:18Z

2

A SwiftyJSON object has an index and content.

To filter a SwiftyJSON object, you can use filter but you have to filter on the second part of the tuple, the content.

Also, you should use the .int property generated by SwiftyJSON if you want to get the Int value.

Example:

let filtered = json.filter { $0.1["submission_id"].int == 27 }

But you can also extract the contents of the SwiftyJSON object to get a Swift array, with .arrayObject.

Then you would filter like this:

if let array = json.arrayObject {
    let filtered = array.filter { $0["submission_id"] as? Int == 27 }
}

answered Jun 2, 2016 at 15:20

Eric Aya

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