Test 1

test1.swift

import Foundation

struct SearchImageParam: Codable {
var size : String?
    var mimeTypes: String?
    var format: String?
    var order: String?
    var limit: Int?
    var page: Int?
    var categoryIds: String?
    
    // if no CodingKeys:
    // var categoryIds -> key:value = categoryIds:value
    // var category_ids -> key:value = category_ids:value
    enum CodingKeys: String, CodingKey {
        case size
        case mimeTypes = "mime_types"
        case order
        case limit
        case page
        case categoryIds = "category_ids"
    }
    
    init(size : ImageSize? = nil, mimeTypes: [MiMeType]? = nil, format: Format? = nil, order: Order? = nil, limit: Int? = nil, page: Int? = nil, categoryIds: [String]? = nil) {
        self.size = size?.rawValue
        self.mimeTypes = MiMeType.typesToString(types: mimeTypes)
        self.format = format?.rawValue
        self.order = order?.rawValue
        self.limit = limit
        self.page = page
        self.categoryIds = categoryIds?.joined(separator: ",")
    }
}