Hello. I was using Plone 5.0.6 several months ago, but when moving from Plone 5.1 to 5.2, I found that the example for rendering viewlets by name no longer works.
See: https://docs.plone.org/develop/plone/views/viewlets.html#rendering-viewlet-by-name
I already have described the problem here: After upgrade to Plone 5.2, the setupViewletByName from Plone Docs doesn't work
I was able to fix it for my custom viewlet by making sure to inherit from Acquisition.Implicit mix-in, but now I want to render the plone.belowcontenttitle.documentbyline viewlet in a customized view. I do not want to override the DocumentByLineViewlet class if I do not have to. Specifically I am having a difficult time understanding why the viewlet as produced by the factory can no longer be wrapped by the context in the function as detailed in the Plone 5 docs.
def setupViewletByName(self, name):
""" Constructs a viewlet instance by its name.
Viewlet update() and render() method are not called.
@return: Viewlet instance of None if viewlet with name does not exist
"""
context = aq_inner(self.context)
request = self.request
# Perform viewlet regisration look-up
# from adapters registry
reg = self.getViewletByName(name)
if reg == None:
return None
# factory method is responsible for creating the viewlet instance
factory = reg.factory
# Create viewlet and put it to the acquisition chain
# Viewlet need initialization parameters: context, request, view
try:
viewlet = factory(context, request, self, None).__of__(context)
except TypeError:
# Bad constructor call parameters
raise RuntimeError(
"Unable to initialize viewlet {}. Factory method {} call failed."
.format(name, str(factory)))
This line: viewlet = factory(context, request, self, None).__of__(context) results in AttributeError: 'DocumentByLineViewlet' object has no attribute '__of__'. First, since I see it is still an issue, I wanted to raise this to see if anyone had found a full solution for rendering existing viewlets by name. The provider syntax that is included in the doc also did not work for the document by line. That is why I fell back to this method in the first place. So any insight will help a great deal. Thanks in advance!