[Zope3-dev] bug setting value to None via edit form

[Garrett Smith]

Independent of the field.missing_value issue, I still think the
following code (in utility.py, line 174):

    if value is not None and (force or not widget.haveData()):
        widget.setData(value)

needs to be:

    if force or not widget.haveData():
        widget.setData(value)

The filter "value is not None" is bad, since None is a legal value to
pass to the widget.

This bug shows up when you delete an integer (i.e. Int field) value in
an HTML form -- the value in the field is updated, but the form is
displayed with the old value...because of that improper check for None.

 -- Garrett