Polymorphic models like rails in Django? [closed]

stackoverflow.com - 2011-03-29 16:31:20 - Similar - Report/Block

rails models by declare :polymorphic => true i could using that as Polymorphic model.. But how can i create polymorphic model in Django I know it's not just simple like doing in rails but i need some introduction for doing this in Django...

How can I define a polymorphic relation between models in Django?

stackoverflow.com - 2009-01-06 10:12:17 - Similar - Report/Block

I am working on a Django application which contains an Offer model. An Offer instance contains the pricing conditions and points to a product definition. The product model is actually a hierarchy (I have a Television model, a Camcorder model, etc.). So I would like the Offer model to contain a polymorphic (or "generic") association to poi...

Django - Polymorphic Models or one big Model?

stackoverflow.com - 2013-05-01 00:14:00 - Similar - Report/Block

I'm currently working on a model in Django involving one model that can have a variety of different traits depending on what kind of object it is. So, let's say we have a model called Mammal, which can either be an Elephant or a Dolphin (with their own traits "tusk_length" and "flipper_length" respectively). Basic OOP principles shout "po...

Django indirect generic relation

stackoverflow.com - 2012-03-01 22:51:48 - Similar - Report/Block

I've been trying to implement a tagging system for my application, where only certain tags are allowed for each content type. I've tried setting the content type on the Tag model, and using this value on the TagAttribution model, and have got... interesting results. Code: from django.db import models from django.contrib.contenttypes.model...

Extend the social_auth User model in Django

stackoverflow.com - 2012-05-12 15:07:57 - Similar - Report/Block

I'm using Django-social-auth for the first time, and it seems that all the new users are registered in the User's model of the social_auth app of my Django website. I have a different model called Users which has some specific data (related to the users activity in the site and relation with other entities) and I want to put the data fetc...

Python/Django models

stackoverflow.com - 2013-03-24 00:51:03 - Similar - Report/Block

I am fairly new to Python/Django. What I would like to do is to store descriptions of cars separately, but simultaneously I would like to label (in django admin) car description like this: class CarDescription(models.Model): length = models.IntegerField(max_length=10) def __unicode__(self): return "description of the car no %d" % (Car.

Django form with list of foreign key fields

stackoverflow.com - 2012-05-20 12:57:15 - Similar - Report/Block

I have the below models for which I'm trying to create a form for: class Letter(models.Model): title = models.CharField(max_length=100) publish_date = models.TimeField() class LetterRecipients(models.Model): letter = models.ForeignKey(Letter) recipient_name = models.CharField(max_length=200) recipient_rating = models.IntegerField()...

How to assign a Unique Level Assessment on Has-Many Relation, Rails

stackoverflow.com - 2012-09-10 21:08:09 - Similar - Report/Block

So I'm trying to come up with a smart/the best rails way to do this, and would appreciate discussing with SO users the best method. Essentially I have two models, let's call the first a Photo and the second an Attribute. A photo has_many attributes (as examples, let's give saturation, color, warmth etc..). The Attribute model carries and...

the right place to keep my signals.py files in django

stackoverflow.com - 2011-08-19 00:53:22 - Similar - Report/Block

based on the documentation i was reading from django site, It seems like signals.py in the app folder is a good place to start with, but the problem am facing is that when I create signals for pre_save and I try to import the class from model, it conflicts with the import operation for task in model. see my code below model.py from django...

Django NameError: name 'models' is not defined

stackoverflow.com - 2012-05-06 06:08:01 - Similar - Report/Block

I have a small application that I wrote in python. Did some research on some web frameworks and decided to use django. I'm reading through the manual and going step by step to learn as much, however I'm stuck on the example given on page 19. When I type the command an I get and error. import datetime from django.utils import timezone # ..

Optional year/month/day in Django model date field(s)

stackoverflow.com - 2012-07-06 00:51:39 - Similar - Report/Block

I want a Django model to have a date field in which the year, month, and day are all optional. An example value could be as generic as or as specific as May 10, 2008 . Is it possible to define a DateField to behave this way? Or am I better off defining year/month/day as separate integers, like this? model Book(models.Model): publicatio...

JQuery file upload with Django on Appengine

stackoverflow.com - 2012-04-18 04:44:48 - Similar - Report/Block

I'm using this plugin to upload multiple files with jquery, and this project is for Django, but now I'm trying to use App Engine datastore. I had success deploying and it works until I try to upload, an error message shows in server log: ValueError: The App Engine storage backend only supports BlobstoreFile instances or File instances w...

evolveStar Join

Could Django project directory more simple structure with or without South?

stackoverflow.com - 2012-05-14 05:21:39 - Similar - Report/Block

I'm a new comer to Django. However, I'm little confused on directory structure of Django,for instance I have to write so many models.py in different place which, presumably, will cause difficulty to maintain the project in future. I want to make it more like real MVC structure, with every model files in a models directory. Could it be pos...

Why does Python raise an exception when I save() a model instance into a MongoDB database?

stackoverflow.com - 2012-04-15 04:08:18 - Similar - Report/Block

I've been using this tutorial to experiment and start up my first Django app using MongoDB. In the tutorial, they build a simple Post class as follows: from django.db import models from djangotoolbox.fields import ListField class Post(models.Model): title = models.CharField() text = models.TextField() tags = ListField() comments = Li...

Routing Polymorphic Requests Rails

stackoverflow.com - 2013-04-05 04:06:49 - Similar - Report/Block

In rails 3, I have several polymorphic models such as Image and Comment , so my question is, When someone makes a request to Create/Update/Destroy a polymorphic object, should the request go to a single controller for the polymorphic object CommentController , or should the request be routed to the controller of the polymorphic accessor...

How to add model forms by Django in Google app engine?

stackoverflow.com - 2012-02-24 20:55:05 - Similar - Report/Block

Since Python 2.7 does not support djangoform.modelform, but support numpy, I have to update my codes from Python 2.5 to 2.7. However, I met some problems when I was trying to add a form by Django.forms.Modelform. I really appreciate for any comments and suggestion. I am using Python 2.7, GAE 1.6.2 and Django 1.2. Here is the code (code 1)...

Django models inheritance and Meta class

stackoverflow.com - 2013-04-26 13:26:13 - Similar - Report/Block

I have a problem with django models inheritance. This is what I have : class Room(models.Model): name = models.CharField(max_length=32) class Container(models.Model): size = models.IntegerField(default=10) ... class BigBox(Container): room = models.ForeignKey(Room) ... class SmallBox(Container): big_box = models.ForeignKey(BigBox)...

Remove duplicates from django list_filter

stackoverflow.com - 2012-05-18 18:49:02 - Similar - Report/Block

I'm using a list filter in django admin on a field in a related object. class A(models.Model): #.. pass class B(models.Model): fk = models.ForeignKey(A) val models.CharField(max_length=1) In the admin for , I'm trying to list_filter B__val , but the result is duplicate 's listed for each satisfying the filter value. Is there an easy...

polymorphic relationships and interfaces/abstract classes/protocols

stackoverflow.com - 2012-02-25 04:01:19 - Similar - Report/Block

I have a polymorphic model Comments that I associate with almost every other model. I have comments index page where I use the title of the model, which I call commentable What is the best way to ensure that the commentable model has a method or attribute called :title In Objective-C I would define a protocol and in other languages I wo...

Django model migrate two tables

stackoverflow.com - 2012-03-20 17:32:41 - Similar - Report/Block

I have a review site, writen in Django,.. How can I migrate a model to obtain review data - I have a product class and a vendor class, and finaly a review class with review for both products and vendors: class Product(models.Model): .... class Vendor(models.Model): .... class Review(models.Model): slug = models.SlugField(max_l...

django record logging using signal or overwrite save method?

stackoverflow.com - 2013-03-21 05:26:21 - Similar - Report/Block

I'm looking for a better way to record every changes to models. here is my log model,copy from django's admin. class LogEntry(models.Model): action_time = models.DateTimeField(_('action time'), auto_now=True) user = models.ForeignKey(User,related_name="act ions") content_type = models.ForeignKey(ContentType, blank=True, null=True,relate...

Django query with simple arithmetic among model fields and comparison with field from another model

stackoverflow.com - 2013-03-23 11:11:34 - Similar - Report/Block

(All code below is a simplified representation of the actual code). If I have the following Django models: - class Material(models.Model): name = models.CharField(max_length=110) class OrderDetail(models.Model): material = models.ForeignKey(Material) order_quantity = models.IntegerField() quantity_delivered = models.IntegerField(null=...

Luis Bacalov - Django

tekstovi-pesama.com - 2013-04-26 12:04:46 - Similar - Report/Block

Django!Django, have you always been alone?Django!Django, have you never loved again?Love will live on, oh oh oh...Life must go on, oh oh oh...For you cannot spend your life regreatting.Django!Django,... Detaljnije pogledajte na sajtu...

When to programmatically create custom Django permissions?

stackoverflow.com - 2012-04-08 16:53:59 - Similar - Report/Block

The permission/authentication documentation for Django 1.4 provides the following snippet for creating custom permissions programmatically: Edit: (I would like to employ this for permissions that are necessarily linked to a specific model class, but more general permissions that span multiple types.) from django.contrib.auth.models impo...

How to query the object which has manytomany field point to them in django

stackoverflow.com - 2013-06-12 00:31:24 - Similar - Report/Block

I have two models User and Company class Company(models.Model): name = models.CharField max_length=50) class User(models.Model): name = models.CharField( max_length=40) following = models.ManyToManyField(Company) I want to get all the company which has some users are following them. Something like Company.objects.filter(has_following =...

NameError django send_mail

stackoverflow.com - 2012-05-14 02:48:30 - Similar - Report/Block

Why am I getting a NameError: global name 'send_mail' is not defined From my models.py: from django.template import Context, loader from django.utils.translation import ugettext as _ from django.core.mail import send_mail ....... class Payment(models.Model): # send email for payment # 1. render context to email template email_template...

Django FileField: how to set default value (auto-create empty file)?

stackoverflow.com - 2010-07-11 20:03:37 - Similar - Report/Block

I've got a model like this: class MyModel(models.Model): name = models.CharField(max_length=255) code = models.FileField() When a new MyModel is submitted, I want to allow for the field to be left empty, in which case I need Django to create an empty file (with arbitrary name). Question is: what is the right way to do it? I coul...

Polymorphic has_many: through in rails

stackoverflow.com - 2012-03-27 19:37:42 - Similar - Report/Block

I have a tags model that I'd like to be polymorphic, but I don't want five records for a tag of "video" for example, I want to create the tag once and be able to use it on a variety of models. I've ready some of the questions here about doing that, but I'm not quite getting how to make it work. So I've got: class Tag < ActiveRecord::Ba...

django how do i find my project name?

stackoverflow.com - 2012-06-24 18:35:55 - Similar - Report/Block

i have a pycharm project and, presumably, a django project. Perhaps they are one and the same, perhaps not - i'm unsure as to the distinction. Anyway, in my settings.py folder (which is in the base of the project directory, which is what i presume is my pycharm project) i have: ROOT_URLCONF = 'dumpstown.urls' does that mean dumpstown is...

Extending Django User for Permission

stackoverflow.com - 2012-04-25 06:54:09 - Similar - Report/Block

I just want List user to be under permission , so i just made one custom model like below from django.db import models from django.contrib.auth.models import Permission,User class Mycustomuser(User): class Meta: permissions = ( ('users','users'), ('view_user', 'View user'), ) In views i simply called items=Mycustomuser.objects.all()...

django.contrib.admin javascript multiple file upload

stackoverflow.com - 2012-04-06 00:37:05 - Similar - Report/Block

I'm not very experienced in django and got stuck ad a point, that might be a common thing. I'm workin on an image app. Registered authors should be able to create a gallery and upload multiple images for it. First I decided to use uploadify. This is how my models look: class Location(models.Model): name = models.CharField(max_length =...

How do you make Django-admin timezone aware?

stackoverflow.com - 2012-03-13 19:44:30 - Similar - Report/Block

I have datetime information stored in the database as UTC. I'm displaying this info using Django admin. Is there a way to display datetime information to the end-user's current timezone in Django admin? Usually I think the logic for this would be in the template/view layer, however, Django-admin hides this all away from you and it seems l...

Rails merge two ActiveRecord::Relation's

stackoverflow.com - 2012-04-05 17:18:37 - Similar - Report/Block

I have a "Profile" model and two ActiveRecord::Relations of this model. SQL request of first relation is very big. Second is Profile.where(:id => 1) I want to add second relation to first. So, as a result, second relation will contain first prrofile. I tried to first.merge(second) but it returns empty relation. Rails version is 3.2.2 O...

Multi-char operators with yacc

stackoverflow.com - 2013-03-04 01:32:52 - Similar - Report/Block

I've been trying to add bitwise operators to a prefix/infix/postfix calculator I was given but for some reason I can't get the operators "<<" "> " "**" to be recognized using yacc. I've looked around for some other people with similar issues, particularly this question yacc/bison tokens error. '>>>' and '>>' both assigned number 62 , but...

Rails upload form with carrierwave and polymorphic associations

stackoverflow.com - 2013-04-13 17:07:49 - Similar - Report/Block

I'm trying to wrap my head around using polymorphic associations to make file management less repetitive in a simple rails app. I'm using carrierwave to handle the file uploading. Here's what I have so far: app/uploaders/file_uploader.rb class FileUploader < CarrierWave::Uploader::Base def store_dir "uploads/#{model.class.to_s.underscor...

Django-pagination for Django 1.4

stackoverflow.com - 2012-06-07 23:54:43 - Similar - Report/Block

The docs for django-pagination are out of date for 1.4. When following them, I don't receive errors but the pagination doesn't work. The pagination page counter loads, but there is no pagination. Here is what I have: settings.py here: TEMPLATE_CONTEXT_PROCESSORS = ( "django.contrib.auth.context_processors. auth", "django.core.context_proce...

Django how to delete from ManyToManyField with extra field?

stackoverflow.com - 2013-06-10 03:11:41 - Similar - Report/Block

In my django app I have models set up similar to these models on the django site - Extra fields on many-to-many relationships . Further down the page, I read The remove() method is disabled for similar reasons. However, the clear() method can be used to remove all many-to-many relationships for an instance: If the remove method is disable...

Backbone Collection of polymorphic Models

stackoverflow.com - 2013-03-20 15:06:54 - Similar - Report/Block

I have a collection of Animals. App.Collections.Animals extends Backbone.Collection model: App.Animal url: '/animals/' #returns json And these animal classes: App.Models.Animal extends Backbone.Model App.Models.Monkey extends App.Models.Animal defaults:{type:'Monkey'} App.Models.Cat extends App.Models.Animal defaults:{type:'Cat'} App.

Specifying multiple "through" tables on the same field in Django

stackoverflow.com - 2013-03-15 16:27:40 - Similar - Report/Block

I'm creating a Django model with two ManyToManyFields that point to the same field. In my example, Talents and Interests are both "Skills" but have a different through table. class Skills(models.Model): def __unicode__(self): return self.name name = models.CharField(max_length=255, unique=True) users = models.ManyToManyField(UserProfi...

How do I go from a MySQLWorkbench EER model (ERD) to Django?

stackoverflow.com - 2012-02-24 18:03:18 - Similar - Report/Block

I designed a database using MySQLWorkbench EER model with many foreign key relationships and tables using Django default naming conventions (like using for primary keys, for foreign keys). Now that I feel that I have a good back-end design, how do I convert that into a Django Python code for models.py ? Do I have to manually type out e...


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