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django-mptt
Utilities for implementing Modified Preorder Tree Traversal
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Issue
26
attachment: tree_order_patch.diff
(10.7 KB)
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Index: mptt/managers.py
===================================================================
--- mptt/managers.py (revision 105)
+++ mptt/managers.py (working copy)
@@ -34,7 +34,7 @@
A manager for working with trees of objects.
"""
def __init__(self, parent_attr, left_attr, right_attr, tree_id_attr,
- level_attr):
+ level_attr, tree_order_attr):
"""
Tree attributes for the model being managed are held as
attributes of this manager for later use, since it will be using
@@ -46,6 +46,7 @@
self.right_attr = right_attr
self.tree_id_attr = tree_id_attr
self.level_attr = level_attr
+ self.tree_order_attr = tree_order_attr
def add_related_count(self, queryset, rel_model, rel_field, count_attr,
cumulative=False):
@@ -121,11 +122,13 @@
raise ValueError(_('Cannot insert a node which has already been saved.'))
if target is None:
+ newtree = self._get_next_tree_id()
setattr(node, self.left_attr, 1)
setattr(node, self.right_attr, 2)
setattr(node, self.level_attr, 0)
- setattr(node, self.tree_id_attr, self._get_next_tree_id())
+ setattr(node, self.tree_id_attr, newtree)
setattr(node, self.parent_attr, None)
+ setattr(node, self.tree_order_attr, '%04d00000001' % (newtree,))
elif target.is_root_node() and position in ['left', 'right']:
target_tree_id = getattr(target, self.tree_id_attr)
if position == 'left':
@@ -142,6 +145,7 @@
setattr(node, self.level_attr, 0)
setattr(node, self.tree_id_attr, tree_id)
setattr(node, self.parent_attr, None)
+ setattr(node, self.tree_order_attr, '%04d00000001' % (tree_id,))
else:
setattr(node, self.left_attr, 0)
setattr(node, self.level_attr, 0)
@@ -157,6 +161,7 @@
setattr(node, self.level_attr, -level)
setattr(node, self.tree_id_attr, tree_id)
setattr(node, self.parent_attr, parent)
+ setattr(node, self.tree_order_attr, '%04d%04d%04d' % (tree_id, -level, -left,))
if commit:
node.save()
@@ -253,6 +258,36 @@
"""
self._manage_space(size, target, tree_id)
+
+ def _update_tree_order(self, lower_tree_id, upper_tree_id=None):
+ """
+ Updates the tree_order field for a range of trees. Takes the values
+ from the existing tree_id, level, and lft values. Should be run after
+ any updates to a tree, movin a node, etc.
+ """
+ #make sure that upper = lower if no lower, and that lower is < upper
+ upper_tree_id = lower_tree_id if not upper_tree_id else upper_tree_id
+ if upper_tree_id < lower_tree_id:
+ upper_tree_id, lower_tree_id = lower_tree_id, upper_tree_id
+
+ opts = self.model._meta
+ update_order_query = """
+ UPDATE %(table)s
+ SET %(tree_order)s = trim(to_char(%(tree_id)s, '0000')) ||
+ trim(to_char(%(level)s, '0000')) ||
+ trim(to_char(%(left)s, '0000'))
+ WHERE %(tree_id)s >= %%s AND %(tree_id)s <= %%s""" % {
+ 'table': qn(opts.db_table),
+ 'level': qn(opts.get_field(self.level_attr).column),
+ 'left': qn(opts.get_field(self.left_attr).column),
+ 'tree_id': qn(opts.get_field(self.tree_id_attr).column),
+ 'tree_order': qn(opts.get_field(self.tree_order_attr).column),
+ }
+
+ cursor = connection.cursor()
+ cursor.execute(update_order_query, [lower_tree_id, upper_tree_id,])
+
+
def _create_tree_space(self, target_tree_id):
"""
Creates space for a new tree by incrementing all tree ids
@@ -267,6 +302,7 @@
'table': qn(opts.db_table),
'tree_id': qn(opts.get_field(self.tree_id_attr).column),
}, [target_tree_id])
+ self._update_tree_order(target_tree_id, 9999999)
def _get_next_tree_id(self):
"""
@@ -281,6 +317,7 @@
row = cursor.fetchone()
return row[0] and (row[0] + 1) or 1
+
def _inter_tree_move_and_close_gap(self, node, level_change,
left_right_change, new_tree_id, parent_pk=None):
"""
@@ -330,9 +367,9 @@
'pk': qn(opts.pk.column),
'new_parent': parent_pk is None and 'NULL' or '%s',
}
-
left = getattr(node, self.left_attr)
right = getattr(node, self.right_attr)
+ tree_id = getattr(node, self.tree_id_attr)
gap_size = right - left + 1
gap_target_left = left - 1
params = [
@@ -343,12 +380,15 @@
left, right, left_right_change,
gap_target_left, gap_size,
node.pk,
- getattr(node, self.tree_id_attr)
+ tree_id
]
+
if parent_pk is not None:
params.insert(-1, parent_pk)
+
cursor = connection.cursor()
cursor.execute(inter_tree_move_query, params)
+ self._update_tree_order(new_tree_id, tree_id)
def _make_child_root_node(self, node, new_tree_id=None):
"""
@@ -379,6 +419,7 @@
setattr(node, self.level_attr, 0)
setattr(node, self.tree_id_attr, new_tree_id)
setattr(node, self.parent_attr, None)
+ setattr(node, self.tree_order_attr, '%04d0000%04d' % (new_tree_id, left - left_right_change,))
def _make_sibling_of_root_node(self, node, target, position):
"""
@@ -456,10 +497,12 @@
'table': qn(opts.db_table),
'tree_id': qn(opts.get_field(self.tree_id_attr).column),
}
+ print 'making sibling of root'
cursor = connection.cursor()
cursor.execute(root_sibling_query, [tree_id, new_tree_id, shift,
lower_bound, upper_bound])
setattr(node, self.tree_id_attr, new_tree_id)
+ self._update_tree_order(lower_bound, upper_bound)
def _manage_space(self, size, target, tree_id):
"""
@@ -489,6 +532,8 @@
cursor.execute(space_query, [target, size, target, size, tree_id,
target, target])
+ self._update_tree_order(tree_id)
+
def _move_child_node(self, node, target, position):
"""
Calls the appropriate method to move child node ``node``
@@ -540,6 +585,7 @@
setattr(node, self.level_attr, level - level_change)
setattr(node, self.tree_id_attr, new_tree_id)
setattr(node, self.parent_attr, parent)
+ setattr(node, self.tree_order_attr, '%04d%04d%04d' % (new_tree_id, level - level_change, left - left_right_change,))
def _move_child_within_tree(self, node, target, position):
"""
@@ -657,13 +703,17 @@
node.pk, parent.pk,
tree_id])
+ self._update_tree_order(tree_id)
+
# Update the node to be consistent with the updated
# tree in the database.
setattr(node, self.left_attr, new_left)
setattr(node, self.right_attr, new_right)
setattr(node, self.level_attr, level - level_change)
setattr(node, self.parent_attr, parent)
+ setattr(node, self.tree_order_attr, '%04d%04d%04d' % (tree_id, level - level_change, new_left,))
+
def _move_root_node(self, node, target, position):
"""
Moves root node``node`` to a different tree, inserting it
@@ -718,6 +768,8 @@
left_right_change, new_tree_id, node.pk, parent.pk, left, right,
tree_id])
+ self._update_tree_order(tree_id, new_tree_id)
+
# Update the former root node to be consistent with the updated
# tree in the database.
setattr(node, self.left_attr, left - left_right_change)
@@ -725,3 +777,5 @@
setattr(node, self.level_attr, level - level_change)
setattr(node, self.tree_id_attr, new_tree_id)
setattr(node, self.parent_attr, parent)
+ setattr(node, self.tree_order_attr, '%04d%04d%04d' % (new_tree_id, level - level_change, left - left_right_change,))
+
Index: mptt/__init__.py
===================================================================
--- mptt/__init__.py (revision 105)
+++ mptt/__init__.py (working copy)
@@ -12,12 +12,12 @@
def register(model, parent_attr='parent', left_attr='lft', right_attr='rght',
tree_id_attr='tree_id', level_attr='level',
- tree_manager_attr='tree', order_insertion_by=None):
+ tree_manager_attr='tree', tree_order_attr='tree_order', order_insertion_by=None):
"""
Sets the given model class up for Modified Preorder Tree Traversal.
"""
from django.db.models import signals as model_signals
- from django.db.models import FieldDoesNotExist, PositiveIntegerField
+ from django.db.models import FieldDoesNotExist, PositiveIntegerField, CharField
from django.dispatch import dispatcher
from django.utils.translation import ugettext as _
@@ -37,6 +37,7 @@
opts.tree_id_attr = tree_id_attr
opts.level_attr = level_attr
opts.tree_manager_attr = tree_manager_attr
+ opts.tree_order_attr = tree_order_attr
opts.order_insertion_by = order_insertion_by
# Add tree fields if they do not exist
@@ -47,6 +48,14 @@
PositiveIntegerField(
db_index=True, editable=False).contribute_to_class(model, attr)
+ #For the tree_order field:
+ try:
+ opts.get_field(tree_order_attr)
+ except FieldDoesNotExist:
+ CharField(max_length=12, null=True, blank=True,
+ db_index=True, editable=False).contribute_to_class(model, attr)
+
+
# Add tree methods for model instances
setattr(model, 'get_ancestors', models.get_ancestors)
setattr(model, 'get_children', models.get_children)
@@ -64,7 +73,7 @@
# Add a custom tree manager
TreeManager(parent_attr, left_attr, right_attr, tree_id_attr,
- level_attr).contribute_to_class(model, tree_manager_attr)
+ level_attr, tree_order_attr).contribute_to_class(model, tree_manager_attr)
setattr(model, '_tree_manager', getattr(model, tree_manager_attr))
# Set up signal receivers to manage the tree when instances of the
Index: mptt/forms.py
===================================================================
--- mptt/forms.py (revision 105)
+++ mptt/forms.py (working copy)
@@ -1,9 +1,9 @@
"""
Form components for working with trees.
"""
-from django import newforms as forms
-from django.newforms.forms import NON_FIELD_ERRORS
-from django.newforms.util import ErrorList
+from django import forms
+from django.forms.forms import NON_FIELD_ERRORS
+from django.forms.util import ErrorList
from django.utils.translation import ugettext_lazy as _
from mptt.exceptions import InvalidMove
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