[Zope-CMF] dynamic list of content-types for the zope ZMI

[Oliver Bleutgen]

Tres Seaver wrote:

> Oliver Bleutgen wrote:
> 
>> Hi,
>>
>> I'm trying to find my way through the API for CMF filesystem products.
>> Bjorn Stabell pointed out to me how to use portal_types + portal_skins 
>> to get a fixed product with changeable "templates".
>>
>> What I want to do is to write a product which can be added through the 
>> ZMI (not the CMF GUI) and where the user can select which template
>> it will use (through selecting the portal_type).
>>
>> The problem is now that I can't know beforehand which different 
>> portal_types will be based on an object of that meta_type, and I'd 
>> like to dynamically gather that list at the moment the user wants to 
>> add an instance.
>>
>> AFAIK, CMF-products use CMFCore.utils.manage_addContentForm(), which 
>> knows about the content_types lastly from utils.ContentInit(...),
>> done in the products __init__.py, where content_types = 
>> (tuple_of_objects,) is passed.
>>
>> Is there a way to stay within the framework (i.e. still use 
>> utils.manage_addContentForm) and get the addForm to show the 
>> content_types dynamically? Using ComputedAttribute perhaps?
> 
> 
> 
> Have a look at how the 'folder_factories' skin method does it
> 
> (basically, it acquires the 'portal_types' tool and then queries
> it for type information objects).
> 
> Tres.

Tres,
thanks for your answer, but I suspect I didn't quite explain myself
  the right way.
For the normal ZMI, CMF-products seem to use utils.manage_addContentForm 
as the addForm - consistently.
This method gathers the right meta_types and passes them
to addInstance form which finally renders the addForm.

     tl = []
     for t in ci.content_types:
         tl.append(t.meta_type)
     return addInstanceForm(addInstanceForm, self, REQUEST,
                            factory_action='manage_addContent',
                            factory_meta_type=ci.meta_type,
                            factory_icon=None,
                            factory_types_list=tl,
                            factory_need_id=1)

Perhaps my question is more of a python question.
Can I achieve ci.content_types to be dynamic? Perhaps with usage of 
ComputedAttribute in my products __init__.py?
As I understand it, your answer covers the things to do after I know how 
to do what I'm not able to ATM.


cheers,
oliver