Re: [Zope] setting Zclass instance id based on propertCharlie wrote: I'm trying to create a context-based id based on the properties. There must be a way to customize the python constructor such that instead of two steps there is a third step that reassigns the value of the id based on properties *after* they are assigned. I'm a designer, not a programmer - can somebody help me out here? I'm looking for someone to fill in the third blank: (1) Add a new instance of the ZClass request = context.REQUEST instance = container.MyZClass.createInObjectManager(request['id'], request) (2) update a property sheet from the form values instance.propertysheets.MyZClassProperties.manage_editProperties(request) (3) set id to be equal several properties (such as section-chapter-book) There is a manage_rename routine. I have never used it myself (other than indirectly by clicking on the 'Rename' button on the ZMI display) so I don't know the parameters required. I would guess it would be something like: <dtml-call "manage_rename(old_id, new_id)"> or <dtml-call "old_id.manage_rename(new_id)"> or <dtml-call "old_id.manage_rename(id=new_id) If these don't work, try looking at the source or maybe someone else on the mailing list has some experience with it. HTH Jonathan Jonathan