Hi, I'm a beginner in Django.
I try implement both sides acces to m2m relation and I have found this old
article about it:
https://www.lasolution.be/blog/related-manytomanyfield-django-admin-site.html
Starting question:
1) is this still the good way in 2017/dj2.0? do we have something better
for this goal?
If no, then it almost works for me,
but I cannot add the wrapper for [+] (for adding of new records) - that has
been described in the end of the article.
I have this code:
class PersonForm(forms.ModelForm):
...
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
if self.instance.pk:
# if this is not a new object, we load related teams
self.initial['teams'] = self.instance.team_set.values_list('pk',
flat=True)
rel = ManyToManyRel(self, Team)
self.fields['teams'].widget =
RelatedFieldWidgetWrapper(self.fields['teams'].widget, rel, admin.site)
The last 2 lines should add the wrapper, but there is a problem.
I use a ManyToManyField without through=..
ManyToManyRel() creates the object (with default parameter through=None),
however it fails while creating RelatedFieldWidgetWrapper with error
'NoneType' object has no attribute '_meta'
in django 2.0 code django/db/models/fields/reverse_related.py,
ManyToManyRel class:
def get_related_field(self):
opts = self.through._meta ...
where self.through is None.
So my main question:
2) Is this issue of the ManyToManyRel class, which allows the default
parameter through=None, however fails in its get_related_field() when the
default is used,
or, should I change my code...?
Best regards,
Mirek
--
You received this message because you are subscribed to the Google Groups
"Django users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at https://groups.google.com/group/django-users.
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-users/84c19ed0-c52e-4398-b300-8450fd90922b%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
