I have a Django admin form with an inline form as follows. It has many to many field. models Place
has photos = models.ManyToManyField(Photo)
, and Photo
is another Django model.
The trouble is that I have too many instances of Photo
, click I edit the form under Django admin, I get a dropdown with all the Photo instance selection.
How can I limit the selections that only has a relationship with Place
?
class Photoinline(admin.TabularInline):
model = Place.photos.through
extra = 1
readonly_fields = ('preview', 'my_order',)
def preview(self, obj):
if obj.photo:
id = obj.photo_id
photo = Photo.objects.get(id=id)
return mark_safe('<img src="/media/%s" width="150" />' % (photo.photo))
else:
return mark_safe('Empty, please upload an image')
def my_order(self, obj):
id = obj.photo_id
photo = Photo.objects.get(id=id)
if not photo.order:
return ""
return photo.order
class PlaceAdmin(admin.ModelAdmin):
list_display = ('name', 'city', 'state', 'country')
exclude = ('photos',)
formfield_overrides = {
models.ForeignKey: {'widget': Select(attrs={'style':'width: 350px;'})},
models.FloatField: {'widget': Select(attrs={'style':'min-width: 350px;'})},
models.URLField: {'widget': TextInput(attrs={'style':'width: 350px;'})},
models.CharField: {'widget': TextInput(attrs={'style':'width: 350px;'})},
models.TextField: {'widget': Textarea(attrs={'style':'width: 350px;height: 38px;'})}
}
inlines = [
Photoinline,
]
You need to save a copy of the Place object that the parent form is updating, and use that object as a clue to limit the choices of Photo form field of the inline forms.
class Photoinline(admin.TabularInline):
model = Place.photos.through
extra = 1
readonly_fields = ('preview', 'my_order',)
def preview(self, obj):
if obj.photo:
id = obj.photo_id
photo = Photo.objects.get(id=id)
return mark_safe('<img src="/media/%s" width="150" />' % (photo.photo))
else:
return mark_safe('Empty, please upload an image')
def my_order(self, obj):
id = obj.photo_id
photo = Photo.objects.get(id=id)
if not photo.order:
return ""
return photo.order
def formfield_for_foreignkey(self, db_field, request=None, **kwargs):
formfield = super(Photoinline, self).formfield_for_foreignkey(db_field, request, **kwargs)
if db_field.name == 'photo':
if request._place_obj is not None:
formfield.queryset = formfield.queryset.filter(place__exact = request._place_obj)
else:
formfield.queryset = formfield.queryset.none()
return formfield
class PlaceAdmin(admin.ModelAdmin):
list_display = ('name', 'city', 'state', 'country')
exclude = ('photos',)
formfield_overrides = {
models.ForeignKey: {'widget': Select(attrs={'style':'width: 350px;'})},
models.FloatField: {'widget': Select(attrs={'style':'min-width: 350px;'})},
models.URLField: {'widget': TextInput(attrs={'style':'width: 350px;'})},
models.CharField: {'widget': TextInput(attrs={'style':'width: 350px;'})},
models.TextField: {'widget': Textarea(attrs={'style':'width: 350px;height: 38px;'})}
}
inlines = [
Photoinline,
]
def get_form(self, request, obj=None, **kwargs):
request._place_obj = obj
return super(PlaceAdmin, self).get_form(request, obj, **kwargs)
This answer may help you know more about the details: https://stackoverflow.com/a/4236159/11326730
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