[jira] [Created] (ISIS-852) Derived property cannot be written properly

["Thomas Koren (JIRA)" <ji...@apache.org>]

Thomas Koren created ISIS-852:
---------------------------------

             Summary: Derived property cannot be written properly
                 Key: ISIS-852
                 URL: https://issues.apache.org/jira/browse/ISIS-852
             Project: Isis
          Issue Type: Bug
          Components: Core, Core: Objectstore: JDO
    Affects Versions: core-1.5.0, objectstore-jdo-1.5.0
            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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