Adding attributes together
This example demonstrates how to add two numeric attributes together and store the result in a third numeric attribute.
To add two numeric attributes together:
- In Object Designer, create two numeric attributes (for example, Int16) on the Incident Management\Incident object called X and Y.
- Set the Default Value for X and Y to 0.
This ensures that the calculation works immediately. If you do not set a default value, the values of X and Y will initially by NULL, which cannot be resolved by the calculation. - Create a numeric attribute called XplusY.
- In the Properties grid for XplusY, set Calculation Type to BeforeSave.
The Edit Formula for XplusY appears. The Editor box already contains:
Copy
import System
static def GetAttributeValue(Incident):
Value =
return Value
- Click at the end of the line Value = , then in the Attributes tree, double-click X.
Incident._X is added to the end of the Value line. Incident is the name of the business object, and _X is the name of the attribute that you created called X. (The _ before the attribute name shows that it is a user-added attribute.) - In the Operators tree, double-click Plus ( + ).
+ is added to the calculation. - In the Attributes tree, double-click Y.
Incident._Y is added to the end of the Value line.
The final calculation in the Editor is:
Copy
import System
static def GetAttributeValue(Incident):
Value = Incident._X + Incident._Y
return Value
Note the single indentation of the final two lines - make sure you keep this indentation.
- Click Test Syntax to confirm that the calculation contains no errors in its structure, then click OK.
The Calculation is added to the attribute. - Save the changes to the object, then start Window Manager.
- Open the Incident window, and add the attributes X, Y and XplusY.
- In the Properties grid for both X and Y, set Is calculate on change to True.
This will make XplusY update whenever X or Y are changed; if you do not set this property to true, XplusY will update only when you save the incident.