How can I use boolean choices in a model field to enable/disable other fields. If a boolean value is true/false I want it to enable/disable other model fields. Is there a way to natively express these relationships using django models/forms/widgets? I keep writing custom templates to model these relationships, but can't figure out a g...
I have a model: class Company(models.Model): name = models.CharField( max_length=100) parent = models.ForeignKey('self', null=True, blank=True, related_name='children') mptt.register(Company, order_insertion_by=['name']) and class Financials(models.Model): year = models.IntegerField() revenue = models.DecimalField(ma...
Here's the deal: I got two db models, let's say ShoppingCart and Order. Following the DRY principle I'd like to extract some common props/methods into a shared interface ItemContainer. Everything went fine till I came across the _flush() method which mainly performs a delete on a related object set. class Order(models.Model, interface...
After getting fine answer to my previous question, I came across another problem. I followed the third approach, being aware of what djangodocs say about abstract model subclassing. I am using the latest Django, rev 9814. The strange behaviour I get: In [1]: o = Order() In [2]: o.save() DEBUG:root:STORING EVENT MESSAGE: Order created...
I have a twenty byte hex hash that I would like to store in a django model. If I use a text field, it's interpreted as unicode and it comes back garbled. Currently I'm encoding it and decoding it, which really clutters up the code, because I have to be able to filter by it. def get_changeset(self): return bin(self._changeset) de...
I have a couple of models in django which are connected many-to-many. I want to create instances of these models in memory, present them to the user (via custom method-calls inside the view-templates) and if the user is satisfied, save them to the database. However, if I try to do anything on the model-instances (call rendering methods,...
I'm currently coding a site in Django (because you can never learn too many frameworks!), and am wondering if there's a way to auto-increment an object with respect to a related object. So for instance, say I have an Entry model and an EntryVersion model: Entry - title - slug EntryVersion - entry (foreign key) - version_number - conte...
What is the best idea to fill up data into a Django model from an external source? E.g. I have a model Run, and runs data in an XML file, which changes weekly. Should I create a view and call that view URL from a curl cronjob (with the advantage that that data can be read anytime, not only when the cronjob runs), or create a python scr...
From the admin panel I want to populate a slug field based on a certain text field eg. Title: My Awesome Page would automaticaly populate Slug: my_awesome_page ...
I need to perform case-insensitive queries on username by default when using the Django Auth framework. I tried fixing the issue by writing a custom subclass of Queryset and overriding the _filter_or_exclude method and then using that subclass in a custom manager for the User model- from django.db.models import Manager from django.db.m...
Okay, how would I do this? class Example(models.Model): parent_example = models.ForeignKey(Example) I want to have a model have a foreign key reference to itself. When I try to create this I get a django validation error that Example is not yet defined. ...
Hi there, I'm struggling with the design of a django application. Given the following models: class A(models.Model): name = models.CharField(max_length=255) class B(models.Model): name = models.CharField(max_length=255) a = models.ForeignKey(A) class C(models.Model): val = models.IntegerField() b = models.ForeignKe...
I'm writing a simple real-estate listing app in Django. Each property needs to have a variable number of images. Images need to have an editable order. And I need to make the admin user-proof. So that said, what are my options? Is there a ImageList field that I don't know about? Is there an app like django.contrib.comments that does ...
Question regarding how to setup dbase relationships (newbie, this may be trivial) Followed the django tutorial (Poll, Choices); understood that 1 Poll has many Choice(s), therefore many Choice(s) point to a single Poll. class Poll(models.Model): question = models.CharField(max_length=200) ... class Choice(models.Mode...
I want to have two foreign keys to the same model: class Test(models.model): example1 = models.ForeignKey(Example) example2 = models.ForeignKey(Example) I get errors like: Accessor for field 'example1' clashes with related field 'Example.test_set'. Add a related_name argument to the definition for 'example1'. ...
I have a Resident and can not seem to get the set of SSA's the resident belongs to. I've tried res.ssa_set.all() .ssas_set.all() and .ssa_resident_set.all(). Can't seem to manage it. What's the syntax for a reverse m2m lookup through another table? EDIT: I'm getting an 'QuerySet as no attribute' error. Erm? class SSA(models.Model): ...
Hello, I'm in the progress of learning Django at the moment but I can't figure out how to solve this problem on my own. I'm reading the book Developers Library - Python Web Development With Django and in one chapter you build a simple CMS system with two models (Story and Category), some generic and custom views together with templates f...
I'm wondering what the common project/application structure is when the user model extended/sub-classed and this Resulting User model is shared and used across multiple apps. I'd like to reference the same user model in multiple apps. I haven't built the login interface yet, so I'm not sure how it should fit together. The following c...
How can i know the next free primary key of some model? ...
I have two models in my Django project: Match Player Match has a ManyToMany property pointing at players, so that multiple players can compete in a match. I'd like to return an informative object name in the Django admin, something like "Richard Henry vs John Doe", by using a join on the players' full names. However the following fai...