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forms.py
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forms.py
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"""Forms for treebeard."""
from django import forms
from django.db.models.query import QuerySet
from django.forms.models import BaseModelForm, ErrorList, model_to_dict
from django.utils.safestring import mark_safe
from django.utils.translation import ugettext_lazy as _
class MoveNodeForm(forms.ModelForm):
"""
Form to handle moving a node in a tree.
Handles sorted/unsorted trees.
"""
__position_choices_sorted = (
('sorted-child', _('Child of')),
('sorted-sibling', _('Sibling of')),
)
__position_choices_unsorted = (
('first-child', _('First child of')),
('left', _('Before')),
('right', _('After')),
)
_position = forms.ChoiceField(required=True, label=_("Position"))
_ref_node_id = forms.TypedChoiceField(required=False,
coerce=int,
label=_("Relative to"))
class Meta:
exclude = ('path',
'depth',
'numchild',
'lft',
'rgt',
'tree_id',
'parent',
'sib_order')
def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
initial=None, error_class=ErrorList, label_suffix=':',
empty_permitted=False, instance=None):
opts = self._meta
if instance:
opts.model = type(instance)
self.is_sorted = (hasattr(opts.model, 'node_order_by') and
opts.model.node_order_by)
if self.is_sorted:
choices_sort_mode = self.__class__.__position_choices_sorted
else:
choices_sort_mode = self.__class__.__position_choices_unsorted
self.declared_fields['_position'].choices = choices_sort_mode
if instance is None:
# if we didn't get an instance, instantiate a new one
instance = opts.model()
object_data = {}
choices_for_node = None
else:
if self.is_sorted:
position = 'sorted-child'
node_parent = instance.get_parent()
if node_parent:
ref_node_id = node_parent.pk
else:
ref_node_id = ''
else:
prev_sibling = instance.get_prev_sibling()
if prev_sibling:
position = 'right'
ref_node_id = prev_sibling.pk
else:
position = 'first-child'
if instance.is_root():
ref_node_id = ''
else:
ref_node_id = instance.get_parent().pk
object_data = model_to_dict(instance, opts.fields, opts.exclude)
object_data.update({'_ref_node_id': ref_node_id,
'_position': position})
choices_for_node = instance
choices = self.mk_dropdown_tree(opts.model, for_node=choices_for_node)
self.declared_fields['_ref_node_id'].choices = choices
self.instance = instance
# if initial was provided, it should override the values from instance
if initial is not None:
object_data.update(initial)
super(BaseModelForm, self).__init__(data, files, auto_id, prefix,
object_data, error_class,
label_suffix, empty_permitted)
def save(self, commit=True):
reference_node_id = 0
if '_ref_node_id' in self.cleaned_data:
reference_node_id = self.cleaned_data['_ref_node_id']
# delete auxilary fields not belonging to node model
del self.cleaned_data['_ref_node_id']
if '_position' in self.cleaned_data:
position_type = self.cleaned_data['_position']
# delete auxilary fields not belonging to node model
del self.cleaned_data['_position']
if self.instance.pk is None:
cl_data = {}
for field in self.cleaned_data:
if not isinstance(self.cleaned_data[field], (list, QuerySet)):
cl_data[field] = self.cleaned_data[field]
if reference_node_id:
reference_node = self.Meta.model.objects.get(
pk=reference_node_id)
self.instance = reference_node.add_child(**cl_data)
self.instance.move(reference_node, pos=position_type)
else:
self.instance = self.Meta.model.add_root(**cl_data)
else:
self.instance.save()
if reference_node_id:
reference_node = self.Meta.model.objects.get(
pk=reference_node_id)
self.instance.move(reference_node, pos=position_type)
else:
if self.is_sorted:
pos = 'sorted-sibling'
else:
pos = 'first-sibling'
self.instance.move(self.Meta.model.get_first_root_node(), pos)
# Reload the instance
self.instance = self.Meta.model.objects.get(pk=self.instance.pk)
super(MoveNodeForm, self).save(commit=commit)
return self.instance
@staticmethod
def is_loop_safe(for_node, possible_parent):
if for_node is not None:
return not (
possible_parent == for_node
) or (possible_parent.is_descendant_of(for_node))
return True
@staticmethod
def mk_indent(level):
return ' ' * (level - 1)
@classmethod
def add_subtree(cls, for_node, node, options):
""" Recursively build options tree. """
if cls.is_loop_safe(for_node, node):
options.append(
(node.pk,
mark_safe(cls.mk_indent(node.get_depth()) + str(node))))
for subnode in node.get_children():
cls.add_subtree(for_node, subnode, options)
@classmethod
def mk_dropdown_tree(cls, model, for_node=None):
""" Creates a tree-like list of choices """
options = [(0, _('-- root --'))]
for node in model.get_root_nodes():
cls.add_subtree(for_node, node, options)
return options