Any Idea how to Decode this JSON

Question

aamirkhan OP

Created Jul ’20

Replies 9

Boosts 0

Views 1.3k

Participants 5

Can Anyone help me out in decoding this JSON

Code Block {
		"name": "Foo",
		"age": 34,
		"activities": [
				{
						"test1": "testing",
						"type": "xyz",
						"three": {
								"label1": "Testing1",
								"content": [
										{
												"mark1": "markTest1",
												"mark2": "markTest2"
										}
								]
						}
				},
				{
						"test2": "Running",
						"type": "zzzz",
						"three": [
								{
										"label2": "Testing1"
								},
								{
										"label2": "Testing1"
								}
						]
				}
		]
}

Answered by espen in 624296022

You can try it like this:

Code Block Swift        let demo = """
{"name":"Foo","age":34,"activities":[{"test1":"testing","type":"xyz","three":{"label1":"Testing1","content":[{"mark1":"markTest1","mark2":"markTest2"}]}},{"test2":"Running","type":"zzzz","three":[{"label2":"Testing1"},{"label2":"Testing1"}]}]}
"""
        guard let data = demo.data(using: .utf8) else { return }
        let decoded = try? JSONDecoder().decode(TopLevel.self, from: data)
        print(decoded?.name)

```

Boost

Answer 1

OOPer OP

Jul ’20

Is this the right structure of your JSON as referred in my comment of another thread of yours?

You should better leave some replies to the comments you get, for better communication.

0

Answer 2

aamirkhan OP

Jul ’20

Yes this is the right JSON any thoughts on how to decode this structure.?

0

Answer 3

OOPer OP

Jul ’20

In my opinion, it is far from well-made-for-Decodable. My best recommendation is to contact to the server side engineer and request them to update the JSON structure in order to fit for Decodable.

Do you insist on using it as is?

0

Answer 4

aamirkhan OP

Jul ’20

Yeah. Is there any way of decoding this type of JSON. I checked we can use enums but i'm kinda wage on using enum can you help me out this!

0

Answer 5

leroykthx OP

Jul ’20

does this stack overflow post answer your question? https://stackoverflow.com/questions/24109608/json-deserialization-in-swift

all you want is to convert the json object to a swift object so you can access the data, right?

0

Answer 6

Claude31 OP

Jul ’20

Could you show the code where you try to decode, and the struct you use to match JSON model ?

0

Answer 7

OOPer OP

Jul ’20

@aamirkhan

Yeah.

Can you tell me why you choose the difficult and hard way?

0

Answer 8

espen OP

Jul ’20

The below code should be able to decode that structure.

Code Block Swiftimport Foundation
// MARK: - TopLevel
struct TopLevel: Codable {
    let name: String
    let age: Int
    let activities: [Activity]
    
    enum CodingKeys: String, CodingKey {
        case name
        case age
        case activities
    }
}
// MARK: - Activity
struct Activity: Codable {
    let test1: String?
    let type: String
    let three: ThreeUnion
    let test2: String?
    
    enum CodingKeys: String, CodingKey {
        case test1
        case type
        case three
        case test2
    }
}
enum ThreeUnion: Codable {
    case purpleThree(PurpleThree)
    case threeElementArray([ThreeElement])
    
    init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        if let x = try? container.decode([ThreeElement].self) {
            self = .threeElementArray(x)
            return
        }
        if let x = try? container.decode(PurpleThree.self) {
            self = .purpleThree(x)
            return
        }
        throw DecodingError.typeMismatch(ThreeUnion.self, DecodingError.Context(codingPath: decoder.codingPath, debugDescription: "Wrong type for ThreeUnion"))
    }
    
    func encode(to encoder: Encoder) throws {
        var container = encoder.singleValueContainer()
        switch self {
        case .purpleThree(let x):
            try container.encode(x)
        case .threeElementArray(let x):
            try container.encode(x)
        }
    }
}
// MARK: - ThreeElement
struct ThreeElement: Codable {
    let label2: String
    
    enum CodingKeys: String, CodingKey {
        case label2
    }
}
// MARK: - PurpleThree
struct PurpleThree: Codable {
    let label1: String
    let content: [SBContent]
    
    enum CodingKeys: String, CodingKey {
        case label1
        case content
    }
}
// MARK: - SBContent
struct SBContent: Codable {
    let mark1: String
    let mark2: String
    
    enum CodingKeys: String, CodingKey {
        case mark1
        case mark2
    }
}

0

Answer 9

espen OP

Jul ’20

Accepted Answer

You can try it like this:

Code Block Swift        let demo = """
{"name":"Foo","age":34,"activities":[{"test1":"testing","type":"xyz","three":{"label1":"Testing1","content":[{"mark1":"markTest1","mark2":"markTest2"}]}},{"test2":"Running","type":"zzzz","three":[{"label2":"Testing1"},{"label2":"Testing1"}]}]}
"""
        guard let data = demo.data(using: .utf8) else { return }
        let decoded = try? JSONDecoder().decode(TopLevel.self, from: data)
        print(decoded?.name)

```

0