How do I add stock portlets (from plone.app.portlets) to my custom portlet manager?

Question

Using the documentation on plone.org along with some in the forum, I was able to get a custom portlet manager below my content in Plone 4.0.8. The goal, actually, is to have 4 custom managers below the content arranged like the dashboard.

Anyway, my manager only allows me to add static and collection portlets. After looking around in the code, I found that when the system goes to populate that 'Add new portlet' dropdown, it loops through all of the portlets. Then, it loops through each portlet's 'for_' attribute checking to see if the interfaces are provided by self--my portlet manager.

def getAddablePortletTypes(self):
    addable = []
    for p in getUtilitiesFor(IPortletType):
        # BBB - first condition, because starting with Plone 3.1                                                                                                                                  
        #every p[1].for_ should be a list                                                                                                                                                         
        if not isinstance(p[1].for_, list):
            logger.warning("Deprecation Warning ..." % p[1].addview)
            if p[1].for_ is None or p[1].for_.providedBy(self):
                addable.append(p[1])
        elif [i for i in p[1].for_ if i.providedBy(self)]:
            addable.append(p[1])
    return addable

How do I add my manager's interface to each portlet's 'for_' list of interfaces?

Answer 1

Your comment is probably the best way to do this. The crux here is that portlets themselves are registered to a portlet manager interface, among other interfaces for contexts, layers, etc.. Another way to do this, for example, would be to add additional registrations in your profiles/default/portlets.xml file to your portlet manager interface for each of the portlets you want addable:

<portlet
  addview="portlets.News"
  title="News"
  description="A portlet which can render a listing of recent news"
  i18n:attributes="title;
                   description"
  >
  <for interface="your.package.IYourPortletManager" />
</portlet>

Your way is probably best, however, since it sounds like you are creating a columnar portlet manager. You could remove IPortletManager from the base classes, however, since IColumn already subclasses it.