Documentation:Derived settable associations: Difference between revisions

Derived settable associations

Latest revision as of 05:29, 22 January 2025

This page was created by Lars.olofsson@mdriven.net on 2021-02-18. Last edited by Stephanie@mdriven.net on 2025-01-22.

Derived attributes & associations are read-only, but you can also have writable associations that update other attributes or links when they themselves are set.

Read here about how that works on attributes: Derived settable attributes.

OCL for reading Class2selection:

self.Class2

EAL for the writing Class2Selection:

self.Class2 := vInputParameter;
self.SelectionLog := self.SelectionLog + DateTime.Now.asString + ': '+ vInputParameter.Name + '\r\n'

The most common use case for this is to execute "extra" code for recalculating other persisted values based on the new value of a change to a link.

Here is the sample model to be loaded into the designer: File:DerivedSettableExample.modlr

@@ Line 1: / Line 1: @@
-[[Derived attributes & associations]] are read-only, but you can also have writable associations that update other attributes or links when they are themselves set. Read here [[Derived settable attributes]] about how that works on attributes.
+<message>Write the content here to display this box</message>
+[[Training:Derived attributes & associations|Derived attributes & associations]] are read-only, but you can also have writable associations that update other attributes or links when they themselves are set.
+Read here about how that works on attributes: [[Documentation:Derived settable attributes|Derived settable attributes]].
+[[File:Derived settable class example.png|none|thumb|531x531px]]
+OCL for reading Class2selection:
+ self.Class2
+EAL for the writing Class2Selection:
+ self.Class2 := vInputParameter;
+ self.SelectionLog := self.SelectionLog + DateTime.Now.asString + ': '+ vInputParameter.Name + '\r\n'
+The most common use case for this is to execute "extra" code for recalculating other persisted values based on the new value of a change to a link.
+Here is the sample model to be loaded into the designer: [[:File:DerivedSettableExample.modlr]]
+[[Category:Associations]]
+{{Edited|July|12|2025}}