[英]Decoding nested json array for ExpandableTableView in swift 4 and Xcode 9
[英]Swift Json decoding nested array / dictionary to flat model
我正在嘗試將以下 json object 解碼給我在 Swift 中的User
model。
我的問題是從tokens
數組中解碼值_id
和token
,其中數組中的第一個令牌包含我要解碼為 User.tokenId 和 User.token 的值。
我正在嘗試將值直接提取/映射到我的用戶 model 結構中,而我的用戶 model 中沒有另一個嵌套結構(例如struct Token { var id: String, var token: String }
)
let json = """
{
"currentLocation": {
"latitude": 0,
"longitude": 0
},
"profileImageUrl": "",
"bio": "",
"_id": "601453e4aae564fc19075b68",
"username": "johnsmith",
"name": "john",
"email": "johnsmith@gmail.com",
"keywords": ["word", "weds"],
"tokens": [
{
"_id": "213453e4aae564fcqu775b69",
"token": "eyJhbGciOiJIUzqoNiIsInR5cCI6IkpXVCJ9.eyJfaWQiOiI2MDE0NTNlNGFhZTU2NGZjMTkwNzViNjgiLCJpYXQiOjE2MTE5NDQ5MzIsImV4cCI6MTYxMjM3NjkzMn0.PbTsA3B0MAfcVvEF1UAMhUXFiqIL1FcxVFGgMTZ5HCk"
}
],
"createdAt": "2021-01-29T18:28:52.845Z",
"updatedAt": "2021-01-29T18:28:52.883Z"
}
""".data(using: .utf8)!
struct User: Codable {
var latitude: Double
var longitude: Double
var profileImageUrl: String
var bio: String
var userId: String
var username: String
var name: String
var email: String
var keywords: [String]
var tokenId: String
var token: String
var createdAt: Date
var updatedAt: Date
private enum UserKeys: String, CodingKey {
case currentLocation
case profileImageUrl
case bio
case userId = "_id"
case username
case name
case email
case keywords
case tokens
case createdAt
case updatedAt
}
private enum CurrentLocationKeys: String, CodingKey {
case latitude
case longitude
}
private enum TokenKeys: String, CodingKey {
case tokenId = "_id"
case token
}
init(from decoder: Decoder) throws {
let userContainer = try decoder.container(keyedBy: UserKeys.self)
let currentLocationContainer = try userContainer.nestedContainer(keyedBy: CurrentLocationKeys.self, forKey: .currentLocation)
self.latitude = try currentLocationContainer.decode(Double.self, forKey: .latitude)
self.longitude = try currentLocationContainer.decode(Double.self, forKey: .longitude)
self.profileImageUrl = try userContainer.decode(String.self, forKey: .profileImageUrl)
self.bio = try userContainer.decode(String.self, forKey: .bio)
self.userId = try userContainer.decode(String.self, forKey: .userId)
self.username = try userContainer.decode(String.self, forKey: .username)
self.name = try userContainer.decode(String.self, forKey: .name)
self.email = try userContainer.decode(String.self, forKey: .email)
self.keywords = try userContainer.decode([String].self, forKey: .keywords)
let tokensContainer = try userContainer.nestedContainer(keyedBy: TokenKeys.self, forKey: .tokens)
self.tokenId = try tokensContainer.decode(String.self, forKey: .tokenId)
self.token = try tokensContainer.decode(String.self, forKey: .token)
self.createdAt = try userContainer.decode(Date.self, forKey: .createdAt)
self.updatedAt = try userContainer.decode(Date.self, forKey: .updatedAt)
}
}
let user = try! decoder.decode(User.self, from: json)
首先,我假設您的decoder
具有適當的日期解碼策略,能夠將 ISO8601 字符串解碼為Date
。
token
字典的封閉容器是一個數組。 您必須插入一個中間nestedUnkeyedContainer
...
var arrayContainer = try userContainer.nestedUnkeyedContainer(forKey: .tokens)
let tokensContainer = try arrayContainer.nestedContainer(keyedBy: TokenKeys.self)
self.tokenId = try tokensContainer.decode(String.self, forKey: .tokenId)
self.token = try tokensContainer.decode(String.self, forKey: .token)
...
將 JSON 解碼為多個結構的代碼要少得多
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