<filename>treenode/forms.py
# -*- coding: utf-8 -*-

from django import forms
from .widgets import TreeWidget


class TreeNodeForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):

        super(TreeNodeForm, self).__init__(*args, **kwargs)

        if 'tn_parent' not in self.fields:
            return
        exclude_pks = []
        obj = self.instance
        if obj.pk:
            exclude_pks += [obj.pk]
            # tn_get_descendants_pks changed to get_descendants_pks()
            # exclude_pks += split_pks(obj.get_descendants_pks())
            exclude_pks += obj.get_descendants_pks()

        # Cheaged to "legal" call
        manager = obj._meta.model.objects

        self.fields['tn_parent'].queryset = manager.prefetch_related(
            'tn_children').exclude(pk__in=exclude_pks)

    class Meta:
        widgets = {
            'tn_parent': TreeWidget(attrs={'style': 'min-width:400px'}),
        }

<filename>treenode/forms.py
# -*- coding: utf-8 -*-

from django import forms
from .widgets import TreeWidget


class TreeNodeForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):

        super(TreeNodeForm, self).__init__(*args, **kwargs)

        if 'tn_parent' not in self.fields:
            return
        exclude_pks = []
        obj = self.instance
        if obj.pk:
            exclude_pks += [obj.pk]
            # tn_get_descendants_pks changed to get_descendants_pks()
            # exclude_pks += split_pks(obj.get_descendants_pks())
            exclude_pks += obj.get_descendants_pks()

        # Cheaged to "legal" call
        manager = obj._meta.model.objects

        self.fields['tn_parent'].queryset = manager.prefetch_related(
            'tn_children').exclude(pk__in=exclude_pks)

    class Meta:
        widgets = {
            'tn_parent': TreeWidget(attrs={'style': 'min-width:400px'}),
        }

# -*- coding: utf-8 -*- # tn_get_descendants_pks changed to get_descendants_pks() # exclude_pks += split_pks(obj.get_descendants_pks()) # Cheaged to "legal" call