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https://issues.apache.org/jira/browse/ISIS-852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14096150#comment-14096150
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Jeroen van der Wal commented on ISIS-852:
-----------------------------------------
You're right! According to the documentation it should be possible. In Estatio
we have never gone this route. Probably Dan can elaborate on this.
> Derived property cannot be written properly
> -------------------------------------------
>
> Key: ISIS-852
> URL: https://issues.apache.org/jira/browse/ISIS-852
> Project: Isis
> Issue Type: Bug
> Components: Viewer: Wicket
> Affects Versions: viewer-wicket-1.6.0
> Reporter: Thomas Koren
> Assignee: Dan Haywood
>
> when using the proposed modifyXxx syntax to make a derived property writable,
> it is rendered as "disabled" in wicket viewer.
> {code:title=demo|borderStyle=solid}
> public LocalDate getDerivedDate() { ... }
> public void modifyDerivedDate(final LocalDate date) { ... }
> {code}
> when using the alternative setXxx syntax, the UI component is writable. but
> in this case, the value of the derived property is not written to the
> persisted property.
> {code:title=demo|borderStyle=solid}
> // {{ BeginAt (property)
> @javax.jdo.annotations.Persistent
> private DateTime beginAt;
> @Disabled
> @javax.jdo.annotations.Column(allowsNull = "false")
> public DateTime getBeginAt() {
> return beginAt;
> }
> public void setBeginAt(final DateTime beginAt) {
> this.beginAt = beginAt;
> }
> // }}
> // {{ DerivedDate (property)
> @NotPersisted
> @NotPersistent
> public LocalDate getDerivedDate() {
> return getBeginAt().toLocalDate();
> }
> public void setDerivedDate(final LocalDate beginDate) {
> setBeginAt(getBeginAt().withDate(beginDate.getYear(),
> beginDate.getMonthOfYear(), beginDate.getDayOfMonth()));
> }
> // }}
> {code}
> it seems like the value set by the derived property gets overwritten by the
> original/old value of the persisted property that is displayed in the wicket
> component.
> therefore it might only be an issue, if original and derived properties are
> members of the same entity and displayed via wicket viewer.
> some background:
> i try to use 3 ui components (= derived properties: date, hour, minute) to
> set a single persisted DateTime property.
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