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Removing an enumeration from a collection [message #1819578]

Fri, 17 January 2020 14:09

Wilbert Alberts

Messages: 193
Registered: June 2010

Senior Member

Hi,

In my language, I have a concept that owns a collection of enumeration values.

In the properties view, I created a (couple of) checkbox(es) that can be used to manipulate this collection. For each checkbox, I created model operations that attempt to add or remove the corresponding value from the collection.

Though I am able to add the element to the collection (by selecting the checkbox), I do not succeed removing the element (by unselecting the checkbox).

Assume that my language contains a enumeration called Format consisting of the literals PLAIN, ZIPPED.

Selection of the 'zipped' checkbox results in the execution of the model operation:

* Set
    Feature Name: formats
    Value expression: aql: drs::ReportFormat::PLAIN

Deselecting the zipped checkbox results in the execution of the model operation:

* Unset
    Feature Name: formats
    Value expression: aql: self.formats->select(f | f = drs::ReportFormat::PLAIN)

For some reason setting (or actually adding) the PLAIN format works, but unsetting doesn't.

Is there an error in my Value expression?

Regards,
Wilbert.

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Re: Removing an enumeration from a collection [message #1819584 is a reply to message #1819578]

Fri, 17 January 2020 15:25

Julien Dupont

Messages: 162
Registered: July 2009

Senior Member

Hello Wilbert,

For use the checkbox in the properties view you just need to use
* Set
Feature Name: formats
Value expression: var:newValue
Don't need to used the unset operation, it's managed automatically by the checkbox.

Regards,

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Re: Removing an enumeration from a collection [message #1819585 is a reply to message #1819584]

Fri, 17 January 2020 15:28

Wilbert Alberts

Messages: 193
Registered: June 2010

Senior Member

Hi Julian,

Note that the type of formats is not a boolean, it is a collection of Enumeration values. If I am not mistaken, newValue in your suggestion represents the state of the checkbox and is a Boolean.

So either I don't understand your solution or it doesn't work. (Theoretically: it could also be that I don't understand it AND it doesn't work ;-) )

Regards,
Wilbert.

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