def __call__(self):
# datev = self.layout
context = self.context
linkquery = {u'i': u'portal_type', u'o': u'plone.app.querystring.operation.selection.any', u'v': [u'Link', u'Document']}
from plone.app.contenttypes.behaviors.collection import ICollection as ICollection_behavior
query = ICollection_behavior(context).query
# import pdb
# pdb.set_trace()
for qr in query:
if qr['i'] == 'portal_type':
break
if bool(qr):
query.remove(qr)
query.append(linkquery)
ICollection_behavior(context).query = query
return "link type has been added to '%s' successfully ." % (context.Title())
