"没有与键 CodingKeys 关联的值"

Question

I'm trying to parse the following json:

"categories": [
        {
            "id": 42,
            "name": "Air Conditioning",
            "image_url": "system-data/category/Category-AirConditioning.png",
            "image_marker_url": "system-data/category/Marker_Category-Air Conditioning.png",
            "status_id": 7,
            "created_at": 1580452213,
            "updated_at": 1580452213
        },
        {
            "id": 43,
            "name": "Car Wash",
            "image_url": "system-data/category/Category-Carwash.png",
            "image_marker_url": "system-data/category/Marker_Category-Car Wash.png",
            "status_id": 7,
            "created_at": 1580452213,
            "updated_at": 1580452213
        },
        {
            "id": 45,
            "name": "Automobile Services",
            "image_url": "system-data/category/Category-Automobile.png",
            "image_marker_url": "system-data/category/Marker_Category-Automobile Services.png",
            "status_id": 7,
            "created_at": 1580452213,
            "updated_at": 1580452213
        },
        {
            "id": 48,
            "name": "Electrical",
            "image_url": "system-data/category/Category-Electrical.png",
            "image_marker_url": "system-data/category/Marker_Category-Electrical.png",
            "status_id": 7,
            "created_at": 1580452213,
            "updated_at": 1580452213
        },
        {
            "id": 49,
            "name": "Generator Repair & Maintenance",
            "image_url": "system-data/category/Category-Generator.png",
            "image_marker_url": "system-data/category/Marker_Category-Generator Repair & Maintenance.png",
            "status_id": 7,
            "created_at": 1580452213,
            "updated_at": 1580452213
        }
    ]

Answer 1

You need

let categories: [CityCategory]

or

struct CityCategoryResponse: Codable{
    let cityCat: [CityCategory] 

  enum CodingKeys: String, CodingKey{
        case cityCat = "categories" 
    }
}

cityCat isn't a key inside your json , hence the decoder can't find it

Answer 2

Had the same issue, but in my case the problem was in a mistyped<\/strong> name of one of my attributes in JSON.