django-mptt | modified pre-order traversal tree | Dataset library
kandi X-RAY | django-mptt Summary
kandi X-RAY | django-mptt Summary
Utilities for implementing a modified pre-order traversal tree in django.
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Top functions reviewed by kandi - BETA
- Build a tree
- Update the space of the tree
- Create a space in the tree
- Tracks the given tree as modified
- Register a model
- Return the MPTT model for the given model class
- Set up the base manager
- Return all the ancestors of this node
- Translate lookups
- Wrapper for mptt filter
- Return a list of results for a given class
- Returns all siblings of this node
- Rebuilds the model
- Render tree links
- Return the leafnodes of the tree
- Return the current node
- Return an indented title
- Returns all descendants of this tree
- Return True if self is an ancestor of other
- Return the root node of a tree
- Rebuild a tree
- Returns all ancestors of this tree
- Delete selected items
- Get information about a tree item
- Delete the tree
- Render the drilldown tree
django-mptt Key Features
django-mptt Examples and Code Snippets
pip install django-mptt-comments
INSTALLED_APPS = (
...
'django.contrib.sites',
'django_comments',
'django_mptt_comments',
'captcha',
'mptt',
...
)
MPTT_COMMENTS_ALLOW_ANONYMOUS = True # True 为允许匿名评论,否则不允许
COMMENTS_APP =
from django.utils.translation import gettext_lazy as _
from collections import defaultdict
from rest_framework.serializers import SerializerMethodField
class GameSerializer(serializers.ModelSerializer):
class Meta:
model = Game
exclude = ['genre', ]
class GenreGameSer
ser = GenreGameSerializer(data=Genre.objects.root_nodes()
.prefetch_related(
'children__children',
'games'
{% extends "admin/mptt_change_list.html" %}
{% load admin_list i18n mptt_admin %}
{% block result_list %}
{% if action_form and actions_on_top and cl.show_admin_actions %}{% admin_actions %}{% endif %}
{% blo
category = Category.objects.get(category_slug=category_slug)
sub_categories = category.get_descendants(include_self=True)
Product.objects.filter(category__in=sub_categories)
def product_list(request, category_slug=
class ParentSerializer(ModelSerializer):
class Meta:
model = Department
fields = ('name')
class DepartmentDetailSerializer(ModelSerializer):
parent = ParentSerializer()
class Meta:
model = Departm
class Genre(MPTTModel):
parent = TreeForeignKey('self', on_delete=models.CASCADE, null=True, blank=True, related_name='children')
class MPTTMeta:
order_insertion_by = ['pk']
Community Discussions
Trending Discussions on django-mptt
QUESTION
I have two models, where one of them has a TreeManyToMany field (a many-to-many field for django-mptt models).
...ANSWER
Answered 2022-Jan-30 at 15:52You should probably check if the reason why you are having those errors is because of duplicate data. If that's the case, I think the ignore_conflicts
parameter of bulk_create
can solve your problem. It will save every valid entry and ignore those who have duplicate conflict.
Check the doc: https://docs.djangoproject.com/en/3.2/ref/models/querysets/#django.db.models.query.QuerySet.bulk_create
QUESTION
I am trying to get custom templates working for djangocms-video.
So far there is a fresh djangocms project set up with some bootstrap and running fine.
According to the readme we would need to specify this in the settings.py to make a custom template available (in this case a template named "feature"):
...ANSWER
Answered 2022-Jan-04 at 21:10In Django, the gettext_lazy(…)
function [Django-doc] is often imported as _
to manage translations. This is explained in the Standard translation:
Python’s standard library
gettext
module installs_()
into the global namespace, as an alias forgettext()
. In Django, we have chosen not to follow this practice, for a couple of reasons(…)
Because of how xgettext (used by makemessages) works, only functions that take a single string argument can be imported as
_
:
You thus should add:
QUESTION
How can I generate a UUIDField that works for SQLite?
I want to use SQLite instead of Postgres for my tests so they run faster.
...ANSWER
Answered 2021-Sep-20 at 10:18Regardless what the underlying type is, Django will transform a UUID to the correct format, and insert it in the database. For SQLite that thus means that the UUIDField
will tranform it to a string.
You thus can create an item with:
QUESTION
I am new to Django and Python. I am practicing creating an online store. I'm facing this problem: When choosing a category, it would be logical to also display products from all its subcategories.
Unfortunately, Google did not help. I think that you need to somehow correctly filter the product in the views, but how? My skills are not enough to understand. I'm using Django-mptt for the category tree (fewer database queries).
For example, there are such categories:
- Clothing
- Jackets
- Hats
If the product is in the "Jackets" category and we go into this category, everything is fine, but if we go to "Clothes" then it will be empty, but you need to have all the products from both the "Jackets" category and from the "Hats".
Now the sorting of products is obtained only by the category that was selected when adding the product.
models.py
...ANSWER
Answered 2021-Sep-07 at 19:21You can do it in an extra step. You need to get child categories and then filter products by them. Example code:
QUESTION
I have a DRF ViewSet that seems is triggering the "create" permission_class (IsListOwner
below) when I simply want to retrieve a list view.
urls.py
...ANSWER
Answered 2021-Aug-27 at 20:58Couple workaround solutions (apart from turning off the browserable API completely):
Turn off the browserable API just for that view
Update permissions.py with a specific condition for "list_id":
QUESTION
I am using Django to develop an ERP and I want to use pre-commit with my project.
I have installed pre-commit, black, flake8, flake8-black. and this is my
...ANSWER
Answered 2021-Jun-27 at 07:04This is a known issue with cpython on windows. The error occurs when black tries to run multiple workers on >60 core machines because the default number of process workers given by os.cpu_count()
breaks some other windows limit (number of waiting processes? I'm not quite sure). Black >=19.10b0
has a fix for this, so try updating the version of black in your pre-commit config if you can?
- Python bug report: https://bugs.python.org/issue26903
- Fix applied by this PR in black: https://github.com/psf/black/pull/838
QUESTION
I'm using django-mptt to create a simple hierarchy in Django-admin. With rest framework I'm exposing an API as following
models.py
...ANSWER
Answered 2021-Mar-26 at 16:05I never used mptt but after a brief look into the docs something like that should work.
QUESTION
I'm following the django-mptt tutorial,and there is a 'name' filed:
...ANSWER
Answered 2021-Mar-03 at 21:46The reason that you got an error when you removed the name field is because the order_insertion_by
option [readthedocs.io] was referring to that field. But you can let it refer to another field. As the documentation says:
order_insertion_by
A list of field names which should define ordering when new tree nodes are being inserted or existing nodes are being reparented, with the most significant ordering field name first. Defaults to
[]
.It is assumed that any field identified as defining ordering will never be NULL in the database.
You can thus for example make use of the primary key instead:
QUESTION
i am using django-mptt library to build a category tree. when i put the code below in my template i get this error.
index.html
...ANSWER
Answered 2020-Dec-06 at 17:11The name of your template variable is listing
, not nodes
:
QUESTION
I want to make a navigation through categories and subcategories in Django.
I install django-mptt and now i get this error."type object 'Category' has no attribute '_mptt_meta' "
models.py
...ANSWER
Answered 2020-Dec-06 at 13:45You need to make Category
a subclass of MPTTModel
:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install django-mptt
You can use django-mptt like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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