In django admin, using django 1.2, i'm trying to add a InlineModelAdmin to apply a comment on save when a change is made to an entry. (An entry is expected to have a "ChangeComment" for every edit).
I don't want to show previous entries, so I am trying to force the ChangeCommentInline's formset.queryset to be empty, by creating NoCommentsInlineFormset and assigning the formset in my ChangeCommentInline, but is still returning existing entries.
Note - In the link above they use BaseModelFormset, I'm using BaseInlineFormset, which I expect may be the issue. If I swap out BaseInlineFormset with BaseModelFormset I get an error about "instance" not existing.
def __init__(self, *args, **kwargs):
super(NoCommentsInlineFormset, self).__init__(*args, **kwargs)
self.queryset = ChangeComment.objects.none()
model = ChangeComment
extra = 1
exclude = ("user", )
formset = NoCommentsInlineFormset
def save_model(self, request, obj, form, change):
"""auto-assign logined in user to comment"""
if not change:
obj.user = request.user
inlines = (ChangeCommentInline, )
As benjaoming mentioned in the comments, it was necessary to override the
get_queryset() method in the
InlineModelAdmin. It was not necessary to override and attach a new formset to the
InlineModelAdmin definition as I initially thought.
Here is the resulting implementation:
class ChangeCommentInline(admin.StackedInline): """For allowing logged in user to add change comment""" model = ChangeComment extra = 1 exclude = ("user", ) # auto-update user field in save_formset method of parent modeladmin. def get_queryset(self, request): """Alter the queryset to return no existing entries""" # get the existing query set, then empty it. qs = super(ChangeCommentInline, self).get_queryset(request) return qs.none()