NestedTabularInline drag-and-drop issue with recursively self-nested inlines

[bhargav066]

i am using nestedtabularinline in my project drag-and-drop is not working after first level inlines

[fdintino]

I think I'll need a bit more detail before I'm able to help you. A stripped down example of your models.py and admin.py, for instance

[bhargav066]

admin.py

from django.contrib import admin

from dashboard.models import Config, DataExtractors, NavigationExtractors
from django.contrib.auth.models import Group
import copy
import nested_admin
from nested_admin.forms import SortableHiddenMixin

class FormatInline(SortableHiddenMixin, nested_admin.NestedTabularInline):
    extra = 0
    sortable_field_name = 'position'

admin.site.site_header = 'dashboard'
admin.site.unregister(Group)
nav_depth_limit = 10

class DataExtractorsInLine(FormatInline):
    model = DataExtractors
    verbose_name = "Data Extractor"
    verbose_name_plural = "Data Extractors"
    exclude = ('navigation_fk',)

class NavDataExtractorsInLine(FormatInline):
    model = DataExtractors
    verbose_name = "NAV Data Extractor"
    verbose_name_plural = "NAV Data Extractors"
    exclude = ('navigation_fk', 'data_config_fk')

nav_attr_dict = {
    'model': NavigationExtractors,
    'inlines': [NavDataExtractorsInLine],
    'exclude': ('child_navigator_fk', 'nav_config_fk'),
}
temp_var = [copy.deepcopy(nav_attr_dict) for _ in range(nav_depth_limit)]

for i in range(nav_depth_limit-1):
    temp_var[i]['inlines'].append(type('NavigationExtractorInLine', (FormatInline,), temp_var[i+1]))
nav_dict = temp_var[0]
del temp_var

class NavigationExtractorInLine(FormatInline):
    model = NavigationExtractors
    inlines = [NavDataExtractorsInLine, type('NavigationExtractorInLine', (FormatInline,), nav_dict)]
    exclude = ('child_navigator_fk',)

class ConfigAdmin(nested_admin.NestedModelAdmin):
    inlines = [DataExtractorsInLine, NavigationExtractorInLine]

admin.site.register(Config, ConfigAdmin)

models.py

from django.db import models

class Config(models.Model):
    config_id = models.PositiveIntegerField(primary_key=True)
    config_name = models.CharField(max_length=200, null=False)
    schema = models.CharField(max_length=100, null=True)

    class Meta:
        db_table = 'crawler_configs'

class NavigationExtractors(models.Model):
    ext_name = models.CharField(max_length=200, null=False)
    position = models.PositiveIntegerField(default=0, null=True)
    child_navigator_fk = models.ForeignKey('self', null=True, on_delete=models.CASCADE, related_name='parent_navigator_fk')
    nav_config_fk = models.ForeignKey(Config, null=True, on_delete=models.CASCADE, related_name='nav_config_fk')

    class Meta:
        db_table = 'navigation_extractors'
        ordering = ['position']

class DataExtractors(models.Model):
    name = models.CharField(max_length=200, null=False)
    position = models.PositiveIntegerField(default=0, null=True)
    data_config_fk = models.ForeignKey(Config, blank=True, null=True, on_delete=models.CASCADE,  related_name='data_config_fk')
    navigation_fk = models.ForeignKey(NavigationExtractors,blank=True, null=True, on_delete=models.CASCADE, related_name='navigation_fk')

    class Meta:
        db_table = 'data_extractors'
        ordering = ['position']

here I am trying to make a model inline to itself until to a depth of 30 for that I generated classes using type inbuilt function, the problem I am getting is for config inlines (admin model ) I am able to sort the data-inline and navigation-inline, but for inlines under navigation drag-and-sort is not working , even if I remove recursive inline for navigation inline and keep only data inline still that problem exists