mORMot Open Source

leus

Member

Registered: 2012-09-05

Posts: 79

Using TObjectList in service

Right now I have a service that receives a custom object.

  IMyService = interface(IInvokable)
    ['{E3186F91-F373-48A6-AE92-8931437D4AAF}']
    function MyMethod(const ClientId: RawUTF8; const MyClass: TMyClass): TCQRSResult;
  end;

TMyClass contains a TObjectList<TAnotherObject>. What is the proper, transparent way to handle this? Register a custom deserialization? I cannot use the "ClassName" hack because I don't control the requests being sent to this service, and I find the custom collections method really cumbersome.

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 15,250

Website

Re: Using TObjectList in service

The easiest way is to use a T*ObjArray.

1. define

type 
  TAnotherObjArray = array of TAnother;

2. call in the initialization section of the unit:

initialization
  TJSONSerializer.RegisterObjArrayForJSON(TypeInfo(TAnotherObjArray), TAnother);

end.

Then you can use TAnotherObjArray as parameter, and you will have the proper serialization.
And no need to release the array: the framework will do it for you.

Also check the ObjArray*() methods to work with this TAnotherObjArray handler.

leus

Member

Registered: 2012-09-05

Posts: 79

Re: Using TObjectList in service

Okay - so no TObjectList but instead use Delphi arrays.  Got it.

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 15,250

Website

Re: Using TObjectList in service

Note that on mORMot2, RegisterObjArrayForJSon() is needed only for Delphi 7-2009.
FPC and Delphi 2010 are able to recognize the "array of TSomeClass" RTTI and find the correlation between types.
One benefit of the big rewrite of RTTI cache in mORMot2.