*The models*
class TagGroup(models.Model):
name = models.SlugField(max_length=50, unique=True, db_index=True)
class Tag(models.Model):
name = models.SlugField(max_length=50, unique=True, db_index=True)
group = models.ForeignKey(TagGroup)
def __unicode__(self):
return self.name
class Album(models.Model):
name = models.CharField(max_length=64, blank=True)
tags = models.ManyToManyField(Tag, blank=True)
*The idea* is to have some groups of tags, for example, season (with the
following tags: winter, summer, etc.) and place (with tags like Europe,
America) for each album.
*The problem* is I can't find a way to have a separate form for each group of
tags in Django Admin.
I've been reading docs for many hours trying to find the solution and here is
where I come.
*First approach*
First of all I decided to create a separate form for tags:
class AlbumAdminForm(forms.ModelForm):
class Meta:
model = Album
tags = forms.ModelMultipleChoiceField(queryset=Tag.objects.all(),
required=False, widget=FilteredSelectMultiple('tags', False ))
class AlbumAdmin(admin.ModelAdmin):
form = AlbumAdminForm
It works good. Trying to add another form like this:
class AlbumAdminForm(forms.ModelForm):
class Meta:
model = Album
tags = forms.ModelMultipleChoiceField(queryset=Tag.objects.filter(group
= 1), required=False, widget=FilteredSelectMultiple('tags', False ))
tags_2 =
forms.ModelMultipleChoiceField(queryset=Tag.objects.filter(group = 2),
required=False, widget=FilteredSelectMultiple('tags', False ))
In this case I see two forms in django admin with tags I can select, but can't
save the contents of the second form because of it's property name 'tags_2' -
django relies on this name. Unfortunately, I didn't find any way to make this
form use Album.tags to save it's values.
*Second approach*
As far as I couldn't find the right way with AlbumAdminForm itself I decided to
change html code it generates. First form looks like this:
<select multiple="multiple" class="selectfilter" name="tags" id="id_tags">
</select><script type="text/javascript">
addEvent(window, "load", function(e) {SelectFilter.init("id_tags",
"tags", 0, "/static/admin/"); });
</script>
I was trying to make the second one as similar as possible, but the only thing
I could change is it's id:
class AlbumAdminForm(forms.ModelForm):
class Meta:
model = Album
tags = forms.ModelMultipleChoiceField(queryset=Tag.objects.filter(group
= 1), required=False, widget=FilteredSelectMultiple('tags', False ))
tags_2 =
forms.ModelMultipleChoiceField(queryset=Tag.objects.filter(group = 2),
required=False, widget=FilteredSelectMultiple('tags', False ))
def __init__(self, *args, **kwargs):
super(AlbumAdminForm, self).__init__(*args, **kwargs)
self.fields['tags_2'].widget.attrs['id'] = 'id_tags'
I couldn't change it's name or 'SelectFilter.init' call. Don't know if it would
be any useful if I could. So, still no luck.
*Third approach*
Trying to use MultiWidget and MultiValueField:
class My(object):
def __init__(self, val1=EmptyQuerySet(), val2=EmptyQuerySet):
self.val1=val1
self.val2=val2
class MyWidget(widgets.MultiWidget):
def __init__(self, attrs=None):
widget = (
FilteredSelectMultiple('tags1', False),
FilteredSelectMultiple('tags2', False)
)
super(MyWidget, self).__init__(widget, attrs=attrs)
def decompress(self,value):
if value:
return value.val1 + value.val2
return None
class MyField(forms.MultiValueField):
widget = MyWidget
def __init__(self, required=True, widget=None, label=None,
initial=None, help_text=None, queryset=None):
field = (
ModelMultipleChoiceField(queryset=queryset),
ModelMultipleChoiceField(queryset=queryset)
)
super(MyField, self).__init__(fields=field, widget=widget,
label=label, initial=initial, help_text=help_text)
class AlbumAdminForm(forms.ModelForm):
class Meta:
model = Album
tags = MyField(queryset=Tag.objects.all())
In this case I have two forms but both are empty, I have nothing to choose. No
luck =(
Could you please help me to resolve this issue? Any help would be greatly
appreciated.
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