Error with GenericTabularInline

[ar7n]

Hello, I have this error trying to use django-admin-sortable2 with GenericTabularInline

AttributeError at /admin/news/news/1/change/
type object 'ImageFormFormSet' has no attribute 'fk'
Request Method:	GET
Request URL:	http://localhost:8000/admin/news/news/1/change/
Django Version:	1.11.1
Exception Type:	AttributeError
Exception Value:	
type object 'ImageFormFormSet' has no attribute 'fk'
Exception Location:	/Users/arseny/www/villagio-realty/env/lib/python3.6/site-packages/django/forms/models.py in get_default_prefix, line 919
Python Executable:	/Users/arseny/www/villagio-realty/env/bin/python
Python Version:	3.6.1
Python Path:	
['/Users/arseny/www/villagio-realty/villagiorealty',
 '/Users/arseny/www/villagio-realty/villagiorealty',
 '/Users/arseny/www/villagio-realty',
 '/Users/arseny/www/villagio-realty/env/lib/python36.zip',
 '/Users/arseny/www/villagio-realty/env/lib/python3.6',
 '/Users/arseny/www/villagio-realty/env/lib/python3.6/lib-dynload',
 '/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6',
 '/Users/arseny/www/villagio-realty/env/lib/python3.6/site-packages']
Server time:	Пт, 19 Май 2017 16:13:37 +0300`

models.py

from django.db import models
from django.contrib.contenttypes.fields import GenericForeignKey
from django.contrib.contenttypes.models import ContentType
from adminsortable.models import SortableMixin


class Image(SortableMixin):
    file = models.ImageField('Файл')
    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE, null=True)
    object_id = models.PositiveIntegerField(null=True)
    content_object = GenericForeignKey('content_type', 'object_id')
    position = models.IntegerField('Позиция', default=0)

    def __str__(self):
        return self.file.url

    class Meta:
        verbose_name = 'Изображение'
        verbose_name_plural = 'Изображения'
        ordering = ('position',)

admin.py

from django.contrib import admin
from django.contrib.contenttypes.admin import GenericTabularInline
from adminsortable2.admin import SortableInlineAdminMixin
from .models import News
from ..image.models import Image


class ImageInline(SortableInlineAdminMixin, GenericTabularInline):
    model = Image


class NewsAdmin(admin.ModelAdmin):
    inlines = (
        ImageInline,
    )

admin.site.register(News, NewsAdmin)

[jrief]

In class Image(SortableMixin): where is your models.Model?

[ar7n]

This version with models.Model has same error

from django.db import models
from django.contrib.contenttypes.fields import GenericForeignKey
from django.contrib.contenttypes.models import ContentType
from imagekit.models import ImageSpecField
from imagekit.processors import Thumbnail
from model_utils.models import TimeStampedModel


class Image(TimeStampedModel, models.Model):
    file = models.ImageField('Файл')
    thumbnail = ImageSpecField(
        source='file',
        processors=[Thumbnail(100, 100, crop=True, upscale=True)])
    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE, null=True)
    object_id = models.PositiveIntegerField(null=True)
    content_object = GenericForeignKey('content_type', 'object_id')
    order = models.PositiveIntegerField(default=0, editable=False, db_index=True)

    def __str__(self):
        return self.file.url

    class Meta:
        verbose_name = 'Изображение'
        verbose_name_plural = 'Изображения'
        ordering = ['order']

[LorisLunedei]

I have the same problem:

AttributeError at /admin/news/news/7/change/

type object 'DownloadFormFormSet' has no attribute 'fk'

Request Method: 	GET
Request URL: 	http://127.0.0.1:8000/admin/news/news/7/change/
Django Version: 	1.11.1
Exception Type: 	AttributeError
Exception Value: 	

type object 'DownloadFormFormSet' has no attribute 'fk'

Exception Location: 	/home/vagrant/.pyenv/versions/backoffice.sagreefeste.local.it/lib/python3.6/site-packages/django/forms/models.py in get_default_prefix, line 919
Python Executable: 	/home/vagrant/.pyenv/versions/backoffice.sagreefeste.local.it/bin/python
Python Version: 	3.6.0
Python Path: 	

['/vagrant',
 '/home/vagrant/.pyenv/versions/3.6.0/lib/python36.zip',
 '/home/vagrant/.pyenv/versions/3.6.0/lib/python3.6',
 '/home/vagrant/.pyenv/versions/3.6.0/lib/python3.6/lib-dynload',
 '/home/vagrant/.pyenv/versions/backoffice.sagreefeste.local.it/lib/python3.6/site-packages']

Server time: 	Lun, 29 Mag 2017 12:19:27 +0000

models.py

from django.db import models
from django.contrib.contenttypes.fields import GenericForeignKey
from django.contrib.contenttypes.models import ContentType
from django.utils.translation import gettext_lazy as _
from model_utils.models import TimeStampedModel


class Download(TimeStampedModel, models.Model):
    name = models.CharField(max_length=500, null=False, blank=False, verbose_name=_("Nome"))
    file = models.FileField(null=False, blank=False, upload_to="downloads/", verbose_name=_("File"))
    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
    object_id = models.PositiveIntegerField()
    content_object = GenericForeignKey('content_type', 'object_id')
    order = models.PositiveIntegerField(
        default=0, verbose_name=_('Ordinamento'), blank=False, null=False)  # default 0 per il sorting

    class Meta:
        verbose_name_plural = _("Downloads")
        ordering = ('order',)

admin.py

...
from django.contrib.contenttypes.admin import GenericTabularInline
from adminsortable2.admin import SortableInlineAdminMixin

class DownloadInline(SortableInlineAdminMixin, GenericTabularInline):
    model = Download
    extra = 0
    list_display = ('name', 'file',)
    verbose_name_plural = 'Downloads'

class NewsAdmin(admin.ModelAdmin):
    readonly_fields = ['thumb']
    search_fields = ['text', ]
    list_display = ['title', 'visible', ]
    save_on_top = True
    inlines = [DownloadInline, ]

admin.site.register(News, NewsAdmin)

[LorisLunedei]

There is some custom implementation for GenericTabularInline?

[makaleks]

Same problem, disappears when SortableInlineAdminMixin is not used.