json - Disappearing SubDetail TObjectList when JSonToObject -


this first question. sorry english.

i have classes this:

tsfis_s = class(tpersistent) private   _sfis_mid  : integer; public   property sfis_mid : integer read _sfis_mid write _sfis_mid; end;  tsfis_d = class(tpersistent) private   _sfis_mid    : integer;   _sfis_s      : tobjectlist<tsfis_s>; public   property sfis_mid    : integer read _sfis_mid write _sfis_mid;   property sfis_s : tobjectlist<tsfis_s> read _sfis_s write _sfis_s; end;  tsfis_m = class(tpersistent) private   _sfis_mid : integer;   _sfis_d : tobjectlist<tsfis_d>; public   property sfis_mid    : integer read _sfis_mid write _sfis_mid;   property sfis_d      : tobjectlist<tsfis_d> read _sfis_d write _sfis_d;   function tojson:tjsonvalue;   destructor destroy; end;

i trying convert tsfis_m object json , revert object datasnap application. use converts , reverters datatypes (tobjectlist , tobjectlist)

{ tsfis_m }  function jsontosfis_m(json: tjsonvalue): tsfis_m; var   unmarshaller: tjsonunmarshal; begin   if json tjsonnull     exit(nil);   unmarshaller := tjsonunmarshal.create;   try     unmarshaller.registerreverter(tsfis_m, '_fistar',       procedure(data: tobject; field: string; arg: string)       var         ctx: trtticontext;         datetime :         tdatetime;       begin         datetime := encodedatetime(strtoint(copy(arg, 7, 4)), strtoint(copy(arg, 4, 2)), strtoint(copy(arg, 1, 2)), strtoint             (copy(arg, 12, 2)), strtoint(copy(arg, 15, 2)), strtoint(copy(arg, 18, 2)), 0);         ctx.gettype(data.classtype).getfield(field).setvalue(data, datetime);       end     );     unmarshaller.registerreverter(tsfis_d, '_sfis_s',       procedure(data: tobject; field: string; args: tlistofobjects)       var         obj: tobject;         sfiss: tobjectlist<tsfis_s>;         sfis, sfisnew: tsfis_s;       begin         if tsfis_d(data)._sfis_s=nil           tsfis_d(data)._sfis_s := tobjectlist<tsfis_s>.create(true);         sfiss := tsfis_d(data)._sfis_s;         sfiss.clear;         obj in args         begin           sfis := obj tsfis_s;           sfisnew := tsfis_s.create;           sfiss.add(sfisnew);           sfisnew._sfis_mid := sfis._sfis_mid;         end;       end     );     unmarshaller.registerreverter(tsfis_m, '_sfis_d',       procedure(data: tobject; field: string; args: tlistofobjects)       var         obj: tobject;         sfisd: tobjectlist<tsfis_d>;         sfis, sfisnew: tsfis_d;         i: integer;       begin         if tsfis_m(data)._sfis_d=nil           tsfis_m(data)._sfis_d := tobjectlist<tsfis_d>.create(true);         sfisd := tsfis_m(data)._sfis_d;         sfisd.clear;         obj in args         begin           sfis := obj tsfis_d;           sfisnew := tsfis_d.create;           sfisd.add(sfisnew);           sfisnew._sfis_mid := sfis._sfis_mid;         end;       end     );     exit(unmarshaller.unmarshal(json) tsfis_m)       unmarshaller.free;   end; end;  function tsfis_m.tojson: tjsonvalue; var   marshaller: tjsonmarshal; begin   if assigned(self)   begin     marshaller := tjsonmarshal.create(tjsonconverter.create);     try       marshaller.registerconverter(tsfis_m, '_sfis_d',                             function(data: tobject; field: string): tlistofobjects                             var                               fisd: tobjectlist<tsfis_d>;                               i: integer;                             begin                               fisd := tsfis_m(data)._sfis_d;                               setlength(result, fisd.count);                               if fisd.count > 0                                 := 0 fisd.count - 1                                   result[i] := fisd[i];                             end);       marshaller.registerconverter(tsfis_m, '_fistar',                             function(data: tobject; field: string): string                             var                               ctx: trtticontext; date : tdatetime;                             begin                               date := ctx.gettype(data.classtype).getfield(field).getvalue(data).astype<tdatetime>;                               result := formatdatetime('dd.mm.yyyy hh:nn:ss', date);                             end);       marshaller.registerconverter(tsfis_d, '_sfis_s',                             function(data: tobject; field: string): tlistofobjects                             var                               fisd: tobjectlist<tsfis_s>;                               i: integer;                             begin                               fisd := tsfis_d(data)._sfis_s;                               setlength(result, fisd.count);                               if fisd.count > 0                                 := 0 fisd.count - 1                                   result[i] := fisd[i];                             end);        exit(marshaller.marshal(self))           marshaller.free;     end;   end   else     exit(tjsonnull.create); end;

and example put 1 button , 2 memo on form. , try created object convert json, json.tostring memo1. , convert jsonvalue object. 

procedure tform1.button1click(sender: tobject); var   mainfis : tsfis_m;   mainfis2 : tsfis_m;   dfis    : tsfis_d;   sfis    : tsfis_s; begin   mainfis := tsfis_m.create;   mainfis.sfis_d := tobjectlist<tsfis_d>.create(true);   dfis := tsfis_d.create;   dfis._sfis_mid := 1;   mainfis.sfis_d.add(dfis);   sfis := tsfis_s.create;   sfis._sfis_mid := 1;   dfis.sfis_s := tobjectlist<tsfis_s>.create(true);   dfis.sfis_s.add(sfis);   memo1.text := mainfis.tojson.tostring;   edit1.text := inttostr(mainfis.sfis_d[0].sfis_s.count);   mainfis2 := jsontosfis_m(mainfis.tojson);   edit2.text := inttostr(mainfis2.sfis_d[0].sfis_s.count); // access violation. because mainfis2.sfis_d[0].sfis_s = nil (that's problem. why?)   memo2.text := mainfis2.tojson.tostring; end;

but when this. tsfis_s disappearing. in first step (objecttojson) no problem. 

{"type":"unit1.tsfis_m","id":1,"fields":      {"_sfis_mid":0,"_sfis_d":       [ {"type":"unit1‌​.tsfis_d","id":2,"fields":             {"_sfis_mid":1,"_sfis_s":                 [ {"type":"unit1.tsfis_s","id":‌​3,"fields":{"_sfis_mid":1} } ]              }       } ]     } }

but when trying revert object reverter goes wrong.

i can't found problem. what's fault.

thanks

ps: if didn't explain, sample code here: http://goo.gl/3qnsw


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