[jboss-jira] [JBoss JIRA] (DROOLS-3249) [DMN Designer] Add support for optional typeRefs

[Matteo Mortari (Jira)]

    [ https://issues.jboss.org/browse/DROOLS-3249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13657015#comment-13657015 ] 

Matteo Mortari commented on DROOLS-3249:
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If the Stunner/framework of the UI does not support null values, then what you describe sounds indeed the most reasonable workaround.

> [DMN Designer] Add support for optional typeRefs
> ------------------------------------------------
>
>                 Key: DROOLS-3249
>                 URL: https://issues.jboss.org/browse/DROOLS-3249
>             Project: Drools
>          Issue Type: Bug
>          Components: DMN Editor
>    Affects Versions: 7.14.0.Final
>            Reporter: Michael Anstis
>            Assignee: Daniel José dos Santos
>            Priority: Critical
>              Labels: drools-tools
>
> At the moment {{TypeRef}} is a mandatory field within the editor.
> This is a hard limitation of use of the Properties Panel bean-binding (it cannot bind to {{null}} values). However the DMN Specification states that {{TypeRef}} are optional (and we are working around by changing the _default_ to {{Any}} - see [DROOLS-3248|https://issues.jboss.org/browse/DROOLS-3248]).
> We need to change the UI and marshaller to be able to support _optional_ {{TypeRef}}. This would (probably) require adding a _magic_ value to {{BuiltInType}} representing a "null" selection. It would need to:
> - Appear at the top of the "Data Type selector" widget (with label "<None>" or similar)
> - Be the _selected_ option when the {{TypeRef}} is the new _magic_ value (this should happen automatically, but worth checking!)
> - The marshaller should set the {{TypeRef}} to the _magic_ {{BuiltInType}} if the DMN model (coming from XML->{{kie-dmn-model}}->workbench model) has a {{null}} {{TypeRef}} - the _magic_ value is only to be used _client-side_.
> - The marshaller should set the {{TypeRef}} to {{null}} when converting from the workbench model to {{kie-dmn-model}} and the workbench model {{TypeRef}} is the _magic_ value - again, the _magic_ value is only to be used _client-side_.
> - Check that creating new data-types does not show the _magic_ value (it uses a different widget, but population of the widget probably iterates all {{BuiltInType}}.
> [~tari_manga] [~karreiro] seem reasonable to you?



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