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• Is there a simple way for QuerySet addition and subtraction in django?

  - by Jonathan

  Consider two QuerySet objects of the same class. Is there a simple way to unify them into a single QuerySet, similar to addition but without duplicates. Also, is there a simple way to subtract them? Removing all elements that appear in both sets from one of the sets?

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• How do I create an empty Django formset using modelformset_factory?

  - by nbolton

  I'm creating a formset, but it seems to populate it with all of the existing data in the table for that object. I can't figure out how to start with a blank formset; the only way seems to be to delete all of the data from the table, but clearly this isn't an option. I will post code if necessary (but there's lots of it, so knowing what is relevant is tricky).

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• Django: How can I add weight/ordering to a many to many relationship?

  - by Klaas van Schelven

  I'm having Pages with TextBlocks on them. Text Blocks may appear on different pages, pages may have several text blocks on them. Every page may have these blocks in an ordering of it's own. This can be solved by using a separate through parameter. Like so: class TextBlock(models.Model): title = models.CharField(max_length=255) text = models.TextField() class Page(models.Model): textblocks = models.ManyToManyField(TextBlock, through=OrderedTextBlock) class OrderedTextBlock(models.Model): text_block = models.ForeignKey(TextBlock) product_page = models.ForeignKey(ProductPage) weight = models.IntegerField() class Meta: ordering = ('weight',) But I'm not very enthousiastic about the violations of DRY for my app. (There's a lot of ordered ManyToMany relations). Is there a recommended way to go about this?

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• How can I have multiple navigation paths with Django, like a simplifies wizard path and a full path?

  - by Zeta

  Lets say I have an application with a structure such as: System set date set name set something Other set death ray target calibrate and I want to have "back" and "next" buttons on a page. The catch is, if you're going in via the "wizard", I want the nav path to be something like "set name" - "set death ray target" - "set name". If you go via the Advanced options menu, I want to just iterate options... "set date" - "set name" - "set something" - "set death ray target" - calibrate. So far, I'm thinking I have to use different URIs, but that's that. Any ideia how this could be done? Thanks.

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• In django, how can I include some default records in my models.py?

  - by kdt

  If I have a models.py like class WidgetType(models.Model): name = models.CharField(max_length=200) class Widget(models.Model): typeid = models.ForeignKey(WidgetType) data = models.CharField(max_length=200) How can I build in a set of built in constant values for WidgetType when I know I'm only going to have a certain few types of widget? Clearly I could fire up my admin interface and add them by hand, but I'd like to simplify configuration by having it built into the python.

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• Where does Django store auth's superuser / pw / e-mail data?

  - by fooba

  After running syncdb and creating a su, where does that get recorded? Settings.py doesn't seem to change.

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• Is there a django template filter to display percentages?

  - by jbochi

  I would like something similar to the string formatting from the standard library. '%' Percentage. Multiplies the number by 100 and displays in fixed ('f') format, followed by a percent sign.

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• Is there a way to get direct_to_template to pass RequestContext in django?

  - by BigJason

  I have found myself writing the same view over and over. It is basically this: def home_index(request): return render_to_response('home/index.html', RequestContext(request)) To keep with the dry principal, I would like to utilize a generic view. I have seen direct_to_template, but it passes an empty context. So how can I use a generic view and still get the power of RequestContext?

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• Django: How can I get a block from a template?

  - by Mark

  Suppose my template has in it something like {% block subject %}my subject{% endblock %} and I load this template with tmpl = loader.get_template('mytemplate.html'), how can I extract "my subject"?

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• In django : how to renew expiry date for current session ?

  - by Rohit

  I have a user logged in. How can i extend/renew expiry date of session received from the request ? Thanks in advance!

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• How do I require a login for a user in Django?

  - by Di Zou

  In my urls.py I have this: (r'^myapp/$', 'myapp.views.views.index'), (r'^myapp/login/$', 'myapp.views.views.login_user'), In my settings.py I have this: LOGIN_URL = '/myapp/login' In my views.py I have this: @login_required((login_url='/myapp/login/') def index(request): return render_to_response('index.html') def login_user(request): #login stuff return render(request, 'registration/login.html', {'state':state, 'username': username}) I can go to mysite.com/myapp/login and the login page works. However, when I go to mysite.com/myapp/index I do not get redirected to the login page even though I am logged out. Why is that and how do I fix it?

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• How do I filter values in a Django form using ModelForm?

  - by malandro95

  I am trying to use the ModelForm to add my data. It is working well, except that the ForeignKey dropdown list is showing all values and I only want it to display the values that a pertinent for the logged in user. Here is my model for ExcludedDate, the record I want to add: class ExcludedDate(models.Model): date = models.DateTimeField() reason = models.CharField(max_length=50) user = models.ForeignKey(User) category = models.ForeignKey(Category) recurring = models.ForeignKey(RecurringExclusion) def __unicode__(self): return self.reason Here is the model for the category, which is the table containing the relationship that I'd like to limit by user: class Category(models.Model): name = models.CharField(max_length=50) user = models.ForeignKey(User, unique=False) def __unicode__(self): return self.name And finally, the form code: class ExcludedDateForm(ModelForm): class Meta: model = models.ExcludedDate exclude = ('user', 'recurring',) How do I get the form to display only the subset of categories where category.user equals the logged in user?

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• Changing a field's nullable attribute in Django after the model is committed?

  - by Rhubarb

  So I have a model that has a field, which originally defaulted to not allow nulls. I want to change it to allow nulls, but syncdb doesn't make the change. Is it as simple as changing it in the database and reflecting it in the models.py file just for the next time its run against a new database?

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• Django: Is it possible to attach media files (css, javascript etc) to a View-class?

  - by mrmclovin

  I can't fins any information on how to define css or javascript files in a view like: class MyView(View): .... class Media: css = { 'all' : 'mystyle.css' } If you have a form you can do like: class MyForm(ModelForm): .... class Media: css = { 'all' : 'mystyle.css' } And then in the template you can print the files like; {{ form.media.css }} I like that Syntax very much and I like to keep the View-specific css files in the app-directory. Does anyone know if it's possible? Thanks!

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• Django: Passing the result of {% trans %} via a filter.

  - by Murkin

  Hello everyone, I have a string that I want passed via the "linebreaks" filter. {% trans "my string"|linebreaks %} Doesn't work. Is there another way ?

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• Playframework and Django

  - by n002213f

  I have worked with Django before and have recently seen the Play framework. Is this the Java community's answer to Django? Any experiences with it? Any performance comparisons with other Java web frameworks? Edit:Almost similar to http://stackoverflow.com/questions/1597086/any-experience-with-play-java-web-development-framework, the responses, unfortunately don't say much about the framework.

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• Convert and convert back datetime in Django

  - by Anshuma

  I am parsing feeds using feedparser and I am trying to store updated or updated_parsed attributes of feeds in Django db. But it shows an error as [u'Enter a valid date/time in YYYY-MM-DD HH:MM[:ss[.uuuuuu]] format.'] Please tell me how to convert updated and updated_parsed such that it can be stored in the Django db such that I can (convert and reuse) or just reuse the date stored in db while parsing in this way: feedparser.parse("url", modified = lastupdate)

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• Node.js as a custom (streaming) upload handler for Django

  - by Gijs

  I want to build an upload-centric app using Django. One way to do this is with nginx's upload module (nonblocking) but it has its problems. Node.js is supposed to be a good candidate for this type of application. But how can I make node.js act as an upload_handler() for Django (http://docs.djangoproject.com/en/1.1/topics/http/file-uploads/#modifying-upload-handlers-on-the-fly) I'm not sure where to look for examples?

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• Having a POST'able API and Django's CSRF Middleware

  - by T. Stone

  I have a Django webapp that has both a front-end, web-accessible component and an API that is accessed by a desktop client. However, now with the new CSRF middleware component, API requests from the desktop client that are POST'ed get a 403. I understand why this is happening, but what is the proper way to fix this without compromising security? Is there someway I can signal in the HTTP header that it's an API request and that Django shouldn't be checking for CSRF or is that a bad strategy?

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• Make CSRF middleware work in Django's 404 error pages

  - by jack

  I put a login box alone with a keyword search box in 404.html in a Django project so in case a 404 error is raised, visitors get more options to jump to other parts. But the CSRF middleware doesn't work in 404 error page with no csrf token rendered. I tried move 'django.middleware.csrf.CsrfViewMiddleware' to first of MIDDLEWARE_CLASSES in settings.py but did not work either. Anyone knows a solution?

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• jQuery as a replacement for Django or Web2Py

  - by ganjod

  Hi all, I was planning to write a new webapp, I figured out two options for my backend - web2py or django. I recently came across jQuery and found it to be very cool. Could I just use jQuery as a replacement for django and web2py and finish this webapp. Some features that I'm going to implement - user profiles, users can add content to the website, etc. Is it possible to do solely in jQuery ?

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• django flatpages in rails?

  - by rakeham

  Hi How can I build a minimal CMS like Django does it with django-flatpages? I prefer a build in solution not a plugin. I heard of controller caching, maybe someone knows a other solution. thanks!

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• Advice on Python/Django and message queues

  - by Andy Hume

  I have an application in Django, that needs to send a large number of emails to users in various use cases. I don't want to handle this synchronously within the application for obvious reasons. Has anyone any recommendations for a message queuing server which integrates well with Python, or they have used on a Django project? The rest of my stack is Apache, mod_python, MySQL.

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• Tornado or Django works with CGI ?

  - by xRobot

  Hi at all, Tornado is a webserver + framework like Django but for real-time features. On my server I don't have a python module or wsgi module so I thought CGI. Is there a way to get Tornado ( or Django ) works by using CGI folder ? If yes, Could you explain me how do I do that ?

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• Activating Eclipse Django Editor on OS X

  - by hekevintran

  I installed a plugin for Eclipse called Django Editor. I can't figure out how to use it. The editor is not in my list of editors so I cannot do "Open with Django Editor" on a file nor associate a file extension with it. It appears nowhere in my preferences. How can I activate this editor? I am running Mac OS X 10.5.8 and Eclipse 3.5.2 Galileo.

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