[Zope3-Users] making anything taggable

[Maken Seteva]

Hi!
Opening up a new thread since the old one is using some old ideas,  
but still thanks to Douglas for replying :)
What I'm really trying to do is probably analogous to the buzzword  
"tagging". In other words a component can have
a list of keywords that describe it. I saw Jeff's sketchy solution in  
another thread but he basically used dublincore..
I want to implement it with my own annotations. Here's my idea:


------------

class ITaggable(IAnnotatable):
     """Marker interface for components that can be tagged"""

class ITagging(Interface):
     tags = List(Word())

-------------
KEY = "foo.bar"

class Tagging(object):
     implements(ITagging)
     adapts(ITaggable)

      def __init__(self, context):
          self.context = self.__parent__ = context
          tags = IAnnotations(context).get(KEY)
          if tags is None:
              tags = annotations[KEY] = PersistentList()
          self.tags = tags
--------------

   <adapter
       factory=".tagging.Tagging"
       trusted="true"
       locate="true"
       />

   <class class=".tagging.Tagging">
     <require
         permission="zope.View"
         interface=".interfaces.ITagging"
         />
   </class>
-----------


Any class that wants to be taggable needs to have ITaggable in its  
<implements interface="..."/>. And then i simply
add Fields(ITagging) to the form_fields of the Add and Edit form.  
This doesn't work, tags doesn't get written
and I think something is missing in the Tagging implementation  
because how would the add/edit-forms know how
to write to the tags attribute?

btw, here's my implementation of the Word schema field i wrote:

class Word(TextLine):
      """A word cannot contain spaces"""
      def constraint(self, value):
          return super(Word, self).constraint(value) and ' ' not in  
value


Thanks!
Setava