[Mailman-Developers] Adding a new list attribute

[Danci Emanuel]

Hi again!

As I said in an earlier post, I am a GSoC student, working for the Systers organization, on integrating the 
dynamic sublists feature ( http://systers.org/systers-dev/doku.php/good_to_know?s%5B%5D=postgresql )
with Mailman 3.0, and I am facing a small problem.

What I wanna do is to adapt the UI and the back-end so they contain the options
needed in order to enable/disable this feature for a list (at creation or after it has already
been created).

I want to get this right, so it would work as good as possible, so this is what I have done
and the error I get:

Firstly, in the class "ListNew" from "forms.py" I added a new ChoiceField, named
"dlists_enabled" (the naming and the text from the labels are temporary until I get
the feature to completely work) 

dlists_enabled = forms.ChoiceField(
    widget = forms.RadioSelect(),
    label = _("Enable dlists for this list?"),
    error_messages = {
            'required': _("Please choose an option."), 
        },
        required = True,
        choices = (
        (True, _("Enable dlists for this list")),
        (False, _("Do not enable dlists for this list"))
        ))
 
This is working properly because if I print the result of "form.cleaned_data['dlists_enabled']" from
"views.py", in a file, it correctly prints the option chosen by the list owner (True or False).

I also added to "views.py" in the "list_new" function the following line (In the try block where 
list_setting are saved):

list_settings["dlists_enabled"] = form.cleaned_data['dlists_enabled']


Secondly, I tried to modify the list attributes by adding the following: 

dlists_enabled = Attribute("""Is the Dynamic sublist feature enabled?""") - "IMailingList" interface (/interfaces/mailinglist.py)
dlists_enabled = Bool() -  "MailingList" class (/model/mailinglist.py)

dlists_enabled = GetterSetter(as_boolean) - to the ATTRIBUTES dict from /rest/configuration.py

mlist.dlists_enabled = True - in the "apply" method from "DefaultStyle" class (/styles/default.py)


Obviously I did something wrong, or I did not add all the necessary changes because when I try to create
a new lists that has the dlists feature enabled, I get the HTTP Error 400: 

HTTP Error 400: Unknown attribute: dlists_enabled


Thanks in advance for your feedback!

Emanuel