How can i handle boolean JSON in IRIS?

InterSystems IRIS handles JSON boolean values (true and false) differently than JSON. In ObjectScript, boolean values are represented as integers: 1 for true and 0 for false [1].

To correctly work with a boolean value from JSON, the following practices are recommended:

1. Conversion During Object Interactions: When defining an object in JSON, you can set properties as "true" or "false" without issue, which will represent these values properly in a JavaScript JSON context. However, IRIS will convert these values to 1 or 0 when interacting via ObjectScript.

2. Setting Boolean Values: If you manually set properties for an object using dot syntax in ObjectScript, you must use 1 or 0 for true and false, respectively, as IRIS will throw a syntax error for direct use of "true" or "false" outside the dynamic JSON context.

3. Best Practice with %Set Method: Use the %Set() method to ensure the type of the values being set. You can specifically set a JSON boolean type by providing its corresponding type parameter as "boolean":

   Set obj.%Set("key", 1, "boolean")  ; Sets key to `true`
   Set obj.%Set("key", 0, "boolean")  ; Sets key to `false`
   

These approaches ensure compatibility and prevent errors when handling JSON boolean values in IRIS [1].

Sources:

Write the id property into your objectscript class, the boolean it is ok

Class MyPackage.MyClass Extends (%Persistent, %JSON.Adaptor)
{
 Property JSONid As %Integer(%JSONFIELDNAME = "id");
 Property strprop As %String;
 Property boolprop As %Boolean;
}
                                                                           

next this worked

set jsn={  "id": 1,  "strprop": "string", "boolprop": true }
set sc=obj.%JSONImport(jsn)
zw obj
+----------------- general information ---------------
|      oref value: 2
|      class name: MyPackage.MyClass
| reference count: 1
+----------------- attribute values ------------------
|       %Concurrency = 1  <Set>
|             JSONid = 1
|           boolprop = 1
|            strprop = "string"
+-----------------------------------------------------