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

[Michael Anstis (Jira)]

Michael Anstis created DROOLS-3249:
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             Summary: [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


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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