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Utilities for implementing Modified Preorder Tree Traversal with your Django Models and working with trees of Model instances.
You can find alternatives to django-mptt on
Django Packages <https://djangopackages.org/grids/g/trees-and-graphs/>
.
Maybe you do not need MPTT, especially when using newer databases. See
django-tree-queries <https://github.com/matthiask/django-tree-queries>
_ for an
implementation using recursive Common Table Expressions (CTE). Here's its
announcement blog post <https://406.ch/writing/django-tree-queries/>
.
Utilities for implementing Modified Preorder Tree Traversal with your Django Models and working with trees of Model instances.
.. image:: https://secure.travis-ci.org/django-mptt/django-mptt.svg?branch=master :alt: Build Status :target: https://travis-ci.org/django-mptt/django-mptt
Project home: https://github.com/django-mptt/django-mptt/
Documentation: https://django-mptt.readthedocs.io/
Discussion group: https://groups.google.com/forum/#!forum/django-mptt-dev
MPTT is a technique for storing hierarchical data in a database. The aim is to make retrieval operations very efficient.
The trade-off for this efficiency is that performing inserts and moving items around the tree are more involved, as there's some extra work required to keep the tree structure in a good state at all times.
Here are a few articles about MPTT to whet your appetite and provide details about how the technique itself works:
Trees in SQL
_Storing Hierarchical Data in a Database
_Managing Hierarchical Data in MySQL
_.. _Trees in SQL
: https://www.ibase.ru/files/articles/programming/dbmstrees/sqltrees.html
.. _Storing Hierarchical Data in a Database
: https://www.sitepoint.com/hierarchical-data-database/
.. _Managing Hierarchical Data in MySQL
: http://mikehillyer.com/articles/managing-hierarchical-data-in-mysql/
django-mptt
?django-mptt
is a reusable Django app that aims to make it easy for you
to use MPTT with your own Django models.
It takes care of the details of managing a database table as a tree structure and provides tools for working with trees of model instances.
Simple registration of models - fields required for tree structure will be added automatically.
The tree structure is automatically updated when you create or delete model instances, or change an instance's parent.
Each level of the tree is automatically sorted by a field (or fields) of your choice.
New model methods are added to each registered model for:
A TreeManager
manager is added to all registered models. This provides
methods to:
Form fields
_ for tree models.
Utility functions
_ for tree models.
Template tags and filters
_ for rendering trees.
Admin classes
_ for visualizing and modifying trees in Django's administration
interface.
.. _Form fields
: https://django-mptt.readthedocs.io/en/latest/forms.html
.. _Utility functions
: https://django-mptt.readthedocs.io/en/latest/utilities.html
.. _Template tags and filters
: https://django-mptt.readthedocs.io/en/latest/templates.html
.. _Admin classes
: https://django-mptt.readthedocs.io/en/latest/admin.html
FAQs
Utilities for implementing Modified Preorder Tree Traversal with your Django Models and working with trees of Model instances.
We found that django-mptt demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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