appending optional elements to an array from json in Swift - json

Question

I have just started getting familiar with JSON. I have a class object that I am initialising by passing in a JSON. This object has an array that may be empty and I need to check it for value. so far I am trying:
init(json: JSON) {
id = json["id"].string
type = json["type"].string
text = json["text"].string
answer = json["answer"].string
format = json["format"].string
answeredBy = []
if let answeredByjson = json["answeredBy"].array {
for (_, userDict) in answeredByjson {
if let userDict = userDict as? [String : Any] {
answeredBy.append(JSON(User(dictionary: userDict)))
}
}
}
}
the elements in the array are dictionaries that have to be used to initialize another object (User).
the error I am getting is:
Expression type '[JSON]' is ambiguous without more context.
How can I update my code?
this is my json:
{
"answer" : "rachel",
"answeredBy" : {
"j1K4WXbOFRXfm3srk9oMtZJ8Iop2" : {
"email" : "an email",
"pictureURL" : "a URL",
"uid" : "j1K4WXbOFRXfm3srk9oMtZJ8Iop2",
"name" : "a name"
},
"vtYlmyerugedizHyOW6TV847Be23" : {
"email" : "an email",
"pictureURL" : "a URL",
"uid" : "vtYlmyerugedizHyOW6TV847Be23",
"name" : "Rusty Shakleford"
}
},
"format" : "field",
"id" : "1",
"type" : "text",
"text" : "In a foot race, Jerry was neither first nor last. Janet beat Jerry, Jerry beat Pat. Charlie was neither first nor last. Charlie beat Rachel. Pat beat Charlie. Who came in last?"
}

Answer 1

if let answeredByjson = json["answeredBy"].array {
...
}
produces an array [JSON], but you expect it to produce a dictionary [String: JSON]. That is why you receive:
Expression type '[JSON]' is ambiguous without more context
To produce a dictionary:
if let answeredByjson = json["answeredBy"].dictionary {
...
}
It you don't expect it to produce a dictionary [String: JSON] then this line doesn't make sense
for (_, userDict) in answeredByjson {