Derived settable associations
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    [[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.  
    [[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: [[Derived settable attributes]].
    Read here about how that works on attributes: [[Documentation:Derived settable attributes|Derived settable attributes]].
    [[File:Derived settable class example.png|none|thumb|531x531px]]
    [[File:Derived settable class example.png|none|thumb|531x531px]]


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    Here is the sample model to be loaded into the designer: [[:File:DerivedSettableExample.modlr]]
    Here is the sample model to be loaded into the designer: [[:File:DerivedSettableExample.modlr]]
    [[Category:Associations]]
    [[Category:Associations]]
    {{Edited|July|12|2024}}
    {{Edited|July|12|2025}}

    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.

    Derived settable class example.png

    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

    Retrieved from "https://learn.mdriven.net/index.php?title=Documentation:Derived_settable_associations&oldid=26035"

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