Swift - Looping over a struct array

Question

This is so basic, I'm a little embarrassed to ask, but... I'm retrieving some JSON from my server into these structs:

struct CategoryInfo: Codable {
    var categoriesResult: [CategoryDetail]
}

struct CategoryDetail: Codable{
    var categoryName: String
    var categoryDescription: String
    var categorySortOrder: Int
    var categoryId: String
}

And now I want to loop over CategoryDetail for each of the few-dozen occurrences, saving them into CoreData. My current attempt looks like this:

            let decoder = JSONDecoder()
            do {
                let categories = try decoder.decode(CategoryInfo.self, from: data!)
                for category in [CategoryDetail] {
                    //... perform the CoreData storage here
                }

But I get the error that CategoryDetail either doesn't conform to Sequence or to IterateProtocol, but when I try to implement those, the solution appears, frankly, too complicated. It's just an array... shouldn't I be able to loop over it without a lot of hoohaw (using that in a technical sense, of course)?

vadian · Accepted Answer · 2020-11-17 21:27:10Z

3

Please take a closer look at your structs

You are decoding the CategoryInfo struct

let categoryInfo = try decoder.decode(CategoryInfo.self, from: data!)

and the categories are in the categoriesResult member

for category in categoryInfo.categoriesResult {
    //... perform the CoreData storage here
}

answered Nov 17, 2020 at 21:27

vadian

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1 Comment

AlanB Over a year ago

Thank you, vadian. I went for a walk and thought through what I was doing wrong - which is exactly as you say.

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