[Pharo-users] NeoJSON. Allowing null or an object

[Juraj Kubelka]

Hi,

Please, how should I modify the mapping to be able to parse the following 
example?

-=-=-=-
rectangleJson := '{
   "origin" : null,
   "corner" : null
}'.

(NeoJSONReader on: rectangleJson readStream)
   mapInstVarsFor: Point;
   for: Rectangle do: [ :mapping | 
      (mapping mapInstVar: #origin) valueSchema: Point.
      (mapping mapInstVar: #corner) valueSchema: Point ];
   nextAs: Rectangle.
-=-=-=-

I receive from a server JSON messages including null values. 
Can we say use Point value schema or null? How? 

In the documentation I can see the example: 

-=-=-=-
String streamContents: [ :stream |
   (NeoJSONWriter on: stream)
      mapAllInstVarsFor: Point;
      writeNil: true;
      nextPut: Point new ].
-=-=-=-
that produces {"x":null,"y":null}

But I do not see how to apply this for the following example: 
-=-=-=-
String streamContents: [ :stream |
   (NeoJSONWriter on: stream)
      mapAllInstVarsFor: Point;
           for: Rectangle do: [ :mapping | 
             (mapping mapInstVar: #origin) valueSchema: Point.
             (mapping mapInstVar: #corner) valueSchema: Point ];
      writeNil: true;
      nextPut: Rectangle new ].
-=-=-=-

Thanks,
Juraj