How to type json properties that are arrays with mixed element types?
Consider the following Json data:
The array elements are lists of integers, strings and objects.
{
"message": [
[ 0, "a text" ],
[ 1 ],
[ 1, { "switch": true } ],
[ 2, "text one", "text line two" ]
]
}
Assume the JsonData const below is filled with the Json above. Using the Json tools from unit REST.Json, I would typically do like this. const JsonData = // see Json data above var Message: TJsonMessage; begin Message := TJson.JsonToObject<TJsonMessage>(JsonData); But - how should TMessageArray be declared to accept the above structure? Is it actually possible? TJsonMessage = class private Fmessage: TMessageArray; public property message: TMessageArray read FMessage write FMessage; end;
Assume the JsonData const below is filled with the Json above. Using the Json tools from unit REST.Json, I would typically do like this. const JsonData = // see Json data above var Message: TJsonMessage; begin Message := TJson.JsonToObject<TJsonMessage>(JsonData); But - how should TMessageArray be declared to accept the above structure? Is it actually possible? TJsonMessage = class private Fmessage: TMessageArray; public property message: TMessageArray read FMessage write FMessage; end;
@Schokohase In fact RTTI is generated for types declared in a DPR file. But it is not findable by TRttiContext.FindType(AQualifiedName: string). In the Delphi help for the function FindType it is written:
But there is no information what types have qualified names. And only in System.Rtti.pas I found this comment:
@Lars Fosdal Unfortunately, this will not work for the Variant type without additional processing. You can try to declare a custom reverter for an element of the inner array.