[Zope] ZClass inheritance and properties (Zope 2.3.0)

[Jim Washington]

Hi, Oliver

Oliver Frommel wrote:
> 
> Hello,
> 
> I found another more subtle problem with ZClass properties.
> When I create two ZClasses, one of which is the parent of the other, some
> properties seem not be inherited properly.
> 
> I create one class ("parent") with parent classes ZObject, CatalogAwareBase
> and ZObjectManager. This class has among others a property called "date1" of
> type Date.
> 
> I create another class ("child") with parent classes ZObject, parent (from
> above)  and ZDTMLDocument.
> 
> Now the problem is that the date1 property is not set properly when I put
> a new value for "date1" an the REQUEST and call
> propertysheets.Basic.manage_editProperties(REQUEST) (which updates all other
> properties of "child" properly).

What propertysheet is date1 on in the parent class?
 
> Also "date1" doesn't show up in the properties tab of any "child" object.
> (Are inherited properties meant to do this??? If not it might be a good idea
> that they do. The property sheet should maybe show inherited properties in
> a different color etc.)
> However when I try to create a new property called "date1" in the "child"
> property sheet I get an error: "Invalid property id, date1. It is in use."

Assure that you have a view established for that propertysheet in the
parent ZClass, then it will appear in the list of available things for a
view in the child ZClass.
 
> Is this the right way I am using kind of multiple inheritance here?
> What am I doing wrong?
> (I am running Zope 2.3.0 on RedHat Linux 6.0)

hth,

-- Jim Washington