django-mptt is an implementation Modified Preorder Tree Traversal for handling trees of Django Model instances.
django-mptt is an implementation Modified Preorder Tree Traversal for handling trees of Django Model instances.
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Questions tagged [django-mptt]
351 questions
8
votes
1 answer
Re-ordering child nodes in django-MPTT
I'm using Ben Firshman's fork of django-MPTT (hat tip to Daniel Roseman for the recommendation).
I've got stuck trying to re-order nodes which share a common parent. I've got a list of primary keys, like this:
ids = [5, 9, 7, 3]
All of these nodes…
Dominic Rodger
- 97,747
- 36
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7
votes
1 answer
Django-mptt model serialize with Django REST framework
I have used django-mptt to store categories hierarchy and I need to serialize all category data in below format.
{
"id": 1,
"name": "FOOD"
"children": [
{
"id": 6,
…
Jay Modi
- 3,161
- 4
- 35
- 52
7
votes
2 answers
Django MPTT efficiently serializing relational data with DRF
I have a Category model that is a MPTT model. It is m2m to Group and I need to serialize the tree with related counts, imagine my Category tree is this:
Root (related to 1 group)
- Branch (related to 2 groups)
- Leaf (related to 3…
WBC
- 1,854
- 4
- 21
- 34
7
votes
1 answer
Django-mptt completely buggy or am I doing it wrong?
I'm attempting to use django-mptt with very little luck. This is with Python2.5, windows, sqlite3, Django 1.2pre , django-mptt latest from svn.
The code:
model:
class Node(models.Model):
name = models.CharField(max_length=20, blank=True)
…
Parand
- 102,950
- 48
- 151
- 186
7
votes
2 answers
How to serialize hierarchical relationship in Django REST
I have a Django model that is hierarchical using django-mptt, which looks like:
class UOMCategory(MPTTModel, BaseModel):
"""
This represents categories of different unit of measurements.
"""
name = models.CharField(max_length=50,…
user3186887
- 103
- 2
- 5
7
votes
0 answers
How to change parent of a node in django-mptt
I m using django-mptt (Ver 5.5) django-mptt.github.io/django-mptt/
I have a tree structure as:
+Object Oriented
|----Java
+Procedural
|----Python
|----PHP
|----B
|----C
now i want to restructure the tree , by changing the parent of Python and PHP…
akm
- 79
- 2
6
votes
4 answers
Why can't I save my model instances after editing them?
I have a model which I can instantiate just fine, but once created, if I attempt to save it I get an IntegrityError saying that the primary key must be unique. What's causing this?
There are other models that inherit from Node, and they're giving…
Jackie
- 61
- 1
- 3
6
votes
1 answer
Storing hierarchical (parent/child) data in Python/Django: MPTT alternative?
I'm looking for a good way to store and use hierarchical (parent/child) data in Django. I've been using django-mptt, but it seems entirely incompatible with my brain - I end up with non-obvious bugs in non-obvious places, mostly when moving things…
Parand
- 102,950
- 48
- 151
- 186
6
votes
1 answer
Acyclic graph in Django
I would like to achieve acyclic graph structure in Django. For example I have some categories in tree structure:
Guitars
- Classical Guitars
- Western Guitars
- Guitars for Children
Ukuleles
- Soprano Ukulele
- Concert Ukulele
- Baryton Ukulele
-…
Tom Tichý
- 1,065
- 1
- 12
- 19
6
votes
3 answers
Wrong results when use `get_ancestors` functions from `django-mptt`
I'm developing a project which uses django-mptt, but I get strange results when I use get_ancestors function. Here is an example.
I have a created a simple model, inherited from MPTTModel:
class Classifier(MPTTModel):
title =…
idea.list
- 145
- 3
- 5
5
votes
1 answer
How to order django-mptt tree by DateTimeField?
This is the model I am using:
class Comment(MPTTModel):
comment = models.CharField(max_length=1023)
resource = models.ForeignKey('Resource')
created_at = models.DateTimeField(auto_now_add=True)
parent = TreeForeignKey('self',…
WSkinner
- 2,147
- 1
- 19
- 21
5
votes
2 answers
Django-MPTT - ordering root nodes by count of immediate descendants
I'm using Django-MPTT to do a display a simple 2 level hierarchy (root => child(ren)). I'm looking for a way to structure my queryset so that nodes get returned with the root node having the most children first and the node with the least children…
NFicano
- 1,065
- 1
- 11
- 26
5
votes
5 answers
Django-MPTT, how to
Hey, I have just installed the django-mptt lib, but i don't know how to get it to work :(
I have added
from mptt.models import MPTTModel
class Category(MPTTModel):
slug = models.SlugField(max_length=200, unique=True)
name =…
pkdkk
- 3,905
- 8
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- 69
5
votes
2 answers
Is it possible to integrate django-taggit and django-mptt / django-treebeard?
I am developing a website that requires tagging up different types of content, which favors using django-taggit. But, it would be extremely beneficial if the tags were represented in the database in their natural hierarchy, favoring use of…
Andrew Swihart
- 619
- 5
- 13
5
votes
2 answers
How to serialize a Django MPTT family and keep it hierarchical?
I was trying to find solution for this (Google cache)
And I could only came up with a solution like this:
import json
from mptt.utils import tree_item_iterator
from rest_framework import generics
from rest_framework.response import Response
from…
diogosimao
- 163
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- 9