Not totally sure this will help with your error, as i haven't come
across it yet.
But for fields that may be empty I also have a blank = True and null =
True. This is to tell the DB that it is acceptable to have no value in
the field.
ie, i'm using the following to choose add users to a private forum
category:
allowedUsers = models.ManyToManyField(User, verbose_name=_('Members'),
blank=True, null=True,
help_text=_('Select Users that are allowed to view this private
group'), limit_choices_to={'is_staff': False}
)
On Feb 4, 12:07 pm, GeneralMean <marcin.wtorkow...@gmail.com> wrote:
> This is a huge one:
>
> I want to implement an optional m2m realtionship in django admin
> application, so it is possible to create a new Game (model description
> below) without choosing any tags associated with it. By default django
> form validation returns an error when I try to do such thing. So I
> created a new form (GamesAdminModelForm) and specified tag field as
> "required=False". It works quite good, to the point when I want to add
> some tags "by hand", after user submited the form. For example user
> creates new Game, and after successful validation I want to add some
> common tags to it.
>
> The problem is, there is, none of the relations to newly created game
> gets saved in DB. No matter what I do, I tried to save it in Game
> model method save(), tried to do that in save_model() method of
> GamesAdmin (of course after calling obj.save(). Code returns no
> exception. I even tried to inject some tags to form in save_model
> method, and then re-saving the form - didn't work out well.
>
> The misterious thing of all, is that when I use function shown below,
> everything works allright, to the point when I delete "assert Null"
> command. What's with that?? When code throws exception m2m
> relationships show up in database, when code DOESN'T throw exception
> DB m2m relationship table remains empty.
>
> def save_model(self, request, obj, form, change):
> obj.save()
> #get some tag
> tag = Tag.objects.get(pk=1)
> #add relationship to new object
> obj.tag.add(tag)
> assert Null
>
> Hope someone gonna find the right answer.
>
> Simplified models:
>
> #in models.py
> class Game(models.Model):
> id = models.AutoField(primary_key=True, db_column='grg_id')
> tags = models.ManyToManyField(Tag, related_name='g_tags')
>
> class Tag(models.Model):
> id = models.AutoField(primary_key=True, db_column='grt_id')
> tag = models.CharField(max_length=255, unique=True,
> db_column='grt_tag')
> tag_url = models.CharField(max_length=255, blank=False,
> db_column='grt_tag_url')
> tag_keyword = models.CharField(max_length=255, blank=False,
> db_column='grt_tag_keyword')
>
> #in admin.py
> class GamesAdmin(admin.ModelAdmin):
> form = GamesAdminModelForm
>
> admin.site.register(Game, GamesAdmin)
> admin.site.register(Tag)
>
> #forms.py
> class GamesAdminModelForm(forms.ModelForm):
> cover = forms.ImageField(widget=ImageWithThumbnailWidget,
> required=False)
> tag = forms.ModelMultipleChoiceField(queryset=Tags.objects.all
> ().order_by('tag'), required=False, widget=FilteredSelectMultiple
> (verbose_name='Tagi', is_stacked=True))
>
> class Meta:
> model = Game
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