Admin site: pass data from AdminModel object to ModelForm object (or another way to pass data to "add" form)

[Артур Скок]

Globally, we need call "add" form for model in admin site, but with options selected by user:

1. user checks items in "changelist" of objects RepoFile

2. select action "create job"

3. redirect user to standard "add" form for new object DeviceCronJob where field download_files already checked by selected files.

May be there is another way to do it. Variants that i tried is below.

I have add form for appropriate model. This model contains multichoice field:

models.py:

class DeviceCronJob(models.Model):
    ...
    download_files = models.TextField(max_length=250, blank=True, verbose_name=_("Files for downloading"))

forms.py:

class DeviceCronJobAddForm(forms.ModelForm):
    download_files = forms.MultipleChoiceField(
            widget=forms.CheckboxSelectMultiple(),
            choices=[(file.hash, "%s [%s]" % (file.full_name,file.link)) for file in RepoFile.objects.filter()]
        )

All work fine if i use standard admin "add".

I have other model RepoFile and customized Action: "Create download cronjob in template". On selecting files and pushing this action i need to pass selected files to DeviceCronJobAddForm.

i tried this:

admin.py
class DeviceCronJobAdmin(ModelAdmin):
    model = DeviceCronJob
    add_form = DeviceCronJobAddForm
    list_display = ('cron_date', 'template', 'description', 'download_files', 'cron_user', 'cron_path', 'cron_mode', 'cdate')
    ...
    def get_form(self, request, obj=None, **kwargs):
        defaults = {}
        setted = request.GET.get('setted','').split(",")
        if obj is None: # if add new
            if len(setted):
                defaults.update({'form': self.add_form(setted=setted)})
            else:
                defaults.update({'form': self.add_form})
        else: # if change view
            defaults.update({
                'form': self.add_form,
            })
        defaults.update(kwargs)
        return super(DeviceCronJobAdmin, self).get_form(request, obj, **defaults)

models.py:
class DeviceCronJobAddForm(forms.ModelForm):
    ...
    def __init__(self, *args, **kwargs):
        files = kwargs.pop('setted','')
        # actions with files
        super(DeviceCronJobAddForm, self).__init__(*args, **kwargs)

but it raises error: unknown setted in super(DeviceCronJobAddForm, self).__init__(*args, **kwargs)

Also i tried pass selected files like GET arguments, but Form has not access to request object