StructToDictionary.swift

protocol StructToDictionary: Encodable {
    var dictionary: [String: Any]? { get }
}

extension StructToDictionary {
    var dictionary: [String: Any]? {
        let encoder = JSONEncoder()
        encoder.keyEncodingStrategy = .convertToSnakeCase
        
        guard let data = try? encoder.encode(self) else {
            return nil
        }
        
        let jsonObject = try? JSONSerialization.jsonObject(with: data, options: .allowFragments)
        let dictionary = jsonObject.flatMap { $0 as? [String: Any] }
        
        return dictionary
    }
}