You can serialize the current ViewModel to a JSON-formatted string with ViewModelAsJSon; use it when an OCL expression needs the ViewModel's current content as JSON.
Use ViewModelAsJSon
ViewModelAsJSon is a function on selfVM, the variable available in a ViewModel context. Call it without arguments:
selfVM.ViewModelAsJSon()
The function returns the content of the current ViewModel as a JSON-formatted string.
Control JSON property names
By default, a JSON property uses the ViewModel attribute's name. Set the attribute's Presentation Name to use a different property name in the JSON output.
This lets you use a property name that cannot be used as a ViewModel attribute name, such as a name containing a dash.
Example
Assume the ViewModel has these attributes:
| ViewModel attribute | Value | Presentation Name |
|---|---|---|
CustomerName
|
Sandra
|
Not set |
OrderAmount
|
6000
|
order-amount
|
Use this expression:
selfVM.ViewModelAsJSon()
The returned JSON string uses CustomerName for the first attribute and the Presentation Name, order-amount, for the second:
{"CustomerName":"Sandra","order-amount":6000}
Using:
selfVM.ViewModelAsJson
Result:
{
"CustomerName": "Sandra",
"order-amount": 6000
}
See also: OCLOperators ViewModelAsXml to get the same information as XML.
Choose JSON or XML
Use ViewModelAsJSon when the receiving code expects JSON. If it expects XML, use ViewModelAsXml instead. The XML operator has its own XML-specific naming and rendering options.