On Friday 19 October 2001 03:10 am, Bocquillon Philippe allegedly wrote:

Hello,

I would like to know how I can (with Python code) limit to one at most the number of items of a given meta type in an ObjectManager object. How to disable the "Add <Meta type>" button when there is already one object of this meta type ?

Thank you in advance,

Philippe Bocquillon

You can create a method all_meta_types in your class to handle this. Since it is a method, it could return different meta-types (or no meta types) depending on the contents of the instance. all_meta_types should return a tuple (or possibly a list) of dictionaries of the format: ({'name': 'Meta Type Name', 'action': 'manage_addSomethingOrOther'}, ...) You can also add an optional permission key as well to specify a permission needed to add the meta type (if it differs from the permission specified by the meta type's class) hth, /---------------------------------------------------\ Casey Duncan, Sr. Web Developer National Legal Aid and Defender Association c.duncan@nlada.org \---------------------------------------------------/