Cannot invoke 'decode' with an argument list of type '(T, from: Data)'

Question

I\'m trying to create a function that takes in a parameter of type \'Codable\' based on the custom JSON models being passed to it. The error :

 Cannot invoke         


        

Answer 1

The type of the type T is its metatype T.Type, therefore the function parameter must be declared as type: T.Type.

You may also want to make the completion handle take a parameter of type T instead of Codable:

static func updateDataModels <T : Codable> (url: serverUrl, type: T.Type,
         completionHandler:@escaping (_ details: T) -> Void) 

When calling the function, use .self to pass the type as an argument:

updateDataModels(url: ..., type: MainDataFamily.self) { ... }