django-polymorphic | Improved Django model inheritance with automatic downcasting | Object-Relational Mapping library
kandi X-RAY | django-polymorphic Summary
kandi X-RAY | django-polymorphic Summary
Improved Django model inheritance with automatic downcasting
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Top functions reviewed by kandi - BETA
- Constructs a form based on the model
- Returns the form class associated with the given model
- Add fields to the form
- Returns the real instance of this model
- Delete all arguments
- Print the number of queries
- Decorator to print timing
- Factory function to create inline formset
- Returns a dict of child forms
- Returns a FormSet instance
- Returns a FormSet containing the child formset
- Return the real instance of the concrete model
- Create a new metaclass
- Creates a manager for the given class
- Returns a breadcrumb scope
- Displays the history view for an object
- Include fieldsets
- Return a FormSet instance
- Return empty empty forms
- Creates a Generic PolymorphicInlineFormSet
- Create a model formset for a model
- Creates a Q instance from a list of models
- Return a subclass of the admin view
- Register a child model
- Get real instances
- Return the Media instance
django-polymorphic Key Features
django-polymorphic Examples and Code Snippets
Lines of Code : 1License : Strong Copyleft (CC BY-SA 4.0)
Copyfrom django.utils.translation import gettext_lazy as _class BetMultipleOrdered(models.Model):
answer = models.ManyToManyField('ChoiceAthlete', blank=True, through='RankedAthlete')
class RankedAthlete(models.Model):
choiceAthlete = models.ForeignKey('ChoiceAthlete', on_delete=models.Cclass Item(models.Model):
upc = models.CharField(max_length=12, null=True)
title = models.CharField(max_length=255, null=True)
brand = models.ForeignKey(Brand)
class Television(Item):
screen_size = models.IntegerField()
c #: Whether the list should be polymorphic too, leave to ``False`` to optimize
polymorphic_list = False
...
def get_queryset(self, request):
# optimize the list display.
qs = super(PolymorphicParentModelAdmclass Test1(models.Model):
key = models.UUIDField('key', db_column='key', editable=False, unique=True, default=uuid.uuid4)
name = models.CharField('name', db_column='name', max_length=128, null=False)
class Meta:
db_taclass Question(PolymorphicModel):
non_polymorphic = models.Manager()
class Meta
base_manager_name = 'non_polymorphic'
class Object(models.Model):
...
class Restaurant(Object):
seats = IntegerField(...)
reservations = ManyToManyField(...)
class Hotel(Object):
rooms = IntegerField(...)
has_pool = BooleanField(...)
toy.toyparts_set.first().part_no
for tp in toy.toyparts_set.select_related('part').all():
print(tp.part_no, tp.part.id)
class UserTimelines(PolymorphicMPTTModel):
parent = PolymorphicTreeForeignKey('self', null=True, blank=True, related_name='children', db_index=True, on_delete=models.CASCADE)
class Meta(PolymorphicMPTTModel.Meta):
verbose_ def items_as_subclasses(qs):
for instance in qs:
try:
yield instance.video
continue
except Video.DoesNotExist:
pass
try:
yield instance.article
Community Discussions
Trending Discussions on django-polymorphic
QUESTION
I'm trying to use a through relationship between a polymorphic and a non-polymorphic table with the the RankedAthlete model:
ANSWER
Answered 2021-May-13 at 12:31This seems to not be possible.
As an alternative, since I only need one type of using an ordered answer, I created a model specificaly for it using the child model rather than the parent model and changed RankedAthlete accordingly:
QUESTION
Let me start by stating that I have looked at django-polymorphic for this and still have questions. I have item models and many subtypes for items. Currently, my models look like this.
...ANSWER
Answered 2020-Jul-22 at 07:49"Abstract base classes are useful when you want to put some common information into a number of other models. This model will then not be used to create any database table. Instead, when it is used as a base class for other models, its fields will be added to those of the child class"
Reference: https://docs.djangoproject.com/en/3.0/topics/db/models/#abstract-base-classes
The point of using inheritance is for sharing common info as mentioned in option (A).
Django-polymorphic makes using inherited models easier, nothing more.
Reference: https://django-polymorphic.readthedocs.io/en/stable/
That means, in conclusion, option (A) is correct even though if you use Django-polymorphic.
Below method is the right approach:
QUESTION
I have a list of global configuration variables in my Django code, where some are integers, and some are strings.
I am currently using django-polymorphic, such that the base model has the name, and the child models have the values.
For example:
...ANSWER
Answered 2020-Jun-22 at 22:23Burried in the source code of polymorphic.admin.parentadmin.py is this:
QUESTION
I currently installed django-cms and djangocms-blog. When I run migrate, it throws the following error. Some ressources suggest to install six, which however is already satisfied in my venv.
I use the latest Python, pip and django versions.
These are the guides I followed to set up djangocms and djangocms-blog.
Any solution to this?
...ANSWER
Answered 2020-May-09 at 16:36python_2_unicode_compatible was removed from Django in 3.0: https://docs.djangoproject.com/en/3.0/releases/3.0/#removed-private-python-2-compatibility-apis
It looks like you need to update one of your packages that's using it. From the traceback, that would be aldryn_apphooks_config. I'm not sure where that comes from, would need some more details for that. I would suggest checking your requirements file and trying to upgrade packages until it works, but you might have to end up removing some.
QUESTION
I have developed a simple project with DjangoCMS(3.7.2) and it works great in the local. I 'm gonna run it on a ubuntu server, which I have another Django project run on it with no issues. Both of my projects are built using python 3.6 & MySQL database. I took these steps to run my new project:
- Cloned the project from the server via git and updated the
settings.pyfile - Created an empty database on the server
- Installed a virtualenv on server by
python3 -m venv venv - Activated the
venvand upgradedpip - Installed requirements successfully using
pip install -r requirements.txt - Tried to Migrate by
python3 manage.py migrate
But I got this error:
...ANSWER
Answered 2020-May-01 at 06:06As Alasdair mentioned:
I reinstalled the Django-CMS module by running python3 -m pip install "django-cms==3.7.2", and surprisingly it worked.
QUESTION
I had a working DjangoCMS application running DjangoCMS 3.7.1 and Django 2.2, however after I just bumped the DjangoCMS version to 3.7.2 and with it, Django to 3.0.1, I am now getting a render error on a page that I have a simple list view.
The site will load my custom account login page just fine, but once logged in, the listview breaks and displays this error: Traceback
...ANSWER
Answered 2020-Apr-27 at 13:38I ran into the same issue upgrading DjangoCMS to 3.7.2. I believe the context argument was removed in Django 3 (source). The problem for me was djangocms-text-ckeditor doesn't support Django 3 yet. More specifically, HTMLField in my model didn't work. I opened an issue here if you want to comment on it as others have done. Maybe it will get them to fix it sooner. For now, you will probably have to wait till it's fixed. Cheers!
QUESTION
I am using Docker to deploy Python2.7 application with Django1.8.
I am facing some issue from last two days and I found error as below.
Docker Image: python:2.7-slim-buster
Error:
...ANSWER
Answered 2020-Apr-02 at 05:13Django-appconf version 1.0.4 only supports Django 1.11 and up and Python 3.5 and up. (https://github.com/django-compressor/django-appconf/blob/v1.0.4/setup.py). You need to downgrade to at least version 1.0.2 (supports Python 2.6+, doesn't say which django version: https://github.com/django-compressor/django-appconf/blob/v1.0.2/setup.py)
QUESTION
I'm working on a django project with postgres where table and field names are generated with double quotes. Anyone knows how can I disable this behavior?
[Model definition]
...ANSWER
Answered 2020-Feb-20 at 19:16This is by design in Django, and it is intentionally designed in this way. this is a parametrized way.
suppose someone has a column name with spaces like test column name then think what would happen.
it will lead to some unwanted errors, so don't change the underlying logic of the framework.
QUESTION
I want to show name of my object on django-admin site, but I`m using django-polymorphic-tree and name of my object should be a text from Contents of this object, how can I do it?
I`ve already tried __str __() in polymorphic tree subclasses, and this is not working because django-polymorphic-tree is using list_display in admin.py and nothing else.
This is part of my models.py
...ANSWER
Answered 2019-Jul-28 at 17:29After few days, I make solution for this problem. It is simple anyway, You must do sth like this:
Models.py:
QUESTION
I have Django 1.6 project and is run using the Gunicorn web application server behind the Nginx web server. Now I want to transfer that project to new host. For that I have copied all code across the new machine and install all required dependencies using pip install -r requirements.txt that went successful.
But after that if I am trying to do either of below python manage.py migrate or python manage.py runserver 0.0.0.0:8000 itt gives below error:
ANSWER
Answered 2018-Feb-23 at 07:13Do (downgrade)
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install django-polymorphic
You can use django-polymorphic 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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