NSNull as invoke param support

[shotkee]

Some solution for "requires that 'NSNull' conform to 'Encodable'" error for hub connection invoke method for param output like { "some_param1": "1231", "some_param2": null} please

[moozzyk]

Please show exactly what you're trying to do. I don't quite understand the relation between invoke and { "some_param1": "1231", "some_param2": null}. Are you trying to send a struct as a parameter? If so, show how you defined your struct.

[shotkee]

I suppose to use invoke method like this

self.connection?.invoke(method: "SomeServerMethod", "123", NSNull(),  "123") { error in }

for invocation data like : Optional

• some : "{\"arguments\":[\"123\",,null,\"123\"],\"streamIds\":[],\"type\":1,\"target\":\"SomeServerMethod\",\"invocationId\":\"1\"}\u{1E}" but i got error about conformance - and I'm forced to use a dirty solution like let null: String? = nil for null parameter and use it instead of Null or Null() or nil)

[moozzyk]

NSNull is a foreign concept in Swift and is not supported by default by Encodable, JSONEncoder etc. I haven't tried but I think using just nil doesn't work because the compiler is not able to figure the generic type. This is why your workaround with creating a variable works - it tells the compiler what type it should expect. I admit it is pretty ugly. But you should be able to reduce the ugliness by invoking this method like this:

self.connection?.invoke(method: "SomeServerMethod", "123", nil as String?,  "123") { error in }

[shotkee]

thank you for explanation