EUnsupportedActionParamType when using TArray<T> in Get request

[Robroeks_Jops (Jan robroeks)]

Hi,

I try to use TArray< T > as input parameter for a get request. Is that supported? And if not, how could this be solved without individual requests per element?

The server throws the following error when starting:
Projext XXX.exe raised exception class EUnsupportedActionParamType with the message 'Cannot define action "test": Invalid type "TArray<System.Integer>" for param "test"

I tried TArray< T > and array of T. The last runs, but does only convert one of the parameters in an array.

The interface:

unit UnLMS_Service_Ritten_INT;

interface

uses
  XData.Service.Common,
  system.Generics.Collections,
  System.JSON;

type
  [ServiceContract]
  [Route('ritten')]
  IRittenService = interface(IInvokable)
    ['{6C57E613-CCAA-4883-AE82-915F6CB705C2}']

    [HttpGet] function test(test: TArray<integer>): integer;
  end;

implementation

initialization
  RegisterServiceType(TypeInfo(IRittenService));

end.

The function in the implementation:

function TRittenService.test(test: TArray<integer>): integer;
begin
 result := 1;
end;

The call with postman (java - Send an Array with an HTTP Get - Stack Overflow):
http://192.168.1.1:9997/app/ritten/test?test[]=1&test[]=3

It works when the request is defined as POST with the array in the body.

[wlandgraf (Wagner Landgraf)]

Unfortunately no, indeed arrays can only be received in JSON, not in URL.
In this case you will have to create a predefined number of parameters, like

    [HttpGet] function test(test1, test2, test3, test4: Integer): integer;

And maybe set all parameters optionals with a default value.

[Robroeks_Jops (Jan robroeks)]

Hi Wagner,

Thank you. I'll create a work around.