Web API: Expression

Expression method runs the given expression and returns the result of the calculated expression formatted as json. Each run is stored to a calculation session, and the same session can be continued in the next expression run. This way, for example initialized variables are available in the next run. Calculatation sessions are maintained in the server memory and dropper latest after 10 minutes if not used. The calculation session is related to the user session, so the calculations are not visible to other users or the same user if login to a new session. There can be multiple calculations sessions within the same user session.

Url: POST /api/expression
Content-Type: application/json;charset=UTF-8
Body: (json object with parameters defined below)

Following parameters can be used in the request body:

• Expression (string): Expression to run.
• SessionName (string): Identifying name for the calculation session.
• ContextType (string): Same as in /api/expression/query.
• ModelId (integer): Same as in /api/expression/query.
• FilterId (integer): Same as in /api/expression/query.
• QueryIdentifier (string): Same as in /api/expression/query.
• CancelEarlierQueriesWithIdentifier (boolean): Same as in /api/expression/query.

Example

This example runs an expression in the Model context and show model id and name. It also assumes that there is a variable variable1 available in the calculation session.

{
  "contextType": "Model",
  "expression": "`${variable1}: ${Id}: ${Name}`",
  "sessionName": "UserSession1",
  "modelId": 123
}