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• How to add an additional field to a queryset?

  - by Mark

  I've got a list of affiliates (users who have referred someone to the site): affiliates = User.objects.annotate(referral_count=Count('referrals')).filter(referral_count__gt=0) And a count of the number of users each affiliate has referred within a time frame: new_users = User.objects.filter(date_joined__gt=sd, date_joined__lte=ed) new_referrals = User.objects.filter(referrals__user__in=new_users).annotate(referral_count=Count('referrals')) How can I do something like new_referrals['affiliate.username'].referral_count from within my template? Note that this is not just a syntax issue, I also need to index new_referrals somehow so that I'm able to do this. Either this, or if I can somehow add a new_referral_count to the first query, that'd work too.

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• Template does not exist: 500.html

  - by xRobot

  I have created a template for 500 http error. I have insert my template 500.html in: 1) /project/ 2) /project/templates/ 3) /python2.5/ 4) /python2.5/templates/ . but I always get this error: TemplateDoesNotExist: 500.html Same problem for Http 404 error. WHY ???

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• Auto-arrange <li> elements into equal columns

  - by 47

  I have several values I'm rendering as elements on my template and I want to further this by having them arranged into equal (or near-equal columns) automatically in the template. How can I achieve this? So far I'm rendering all the values as <ul> {% for feature in features %} <li>{{ feature }}</li> {% endfor %} </ul>

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• Automark model names/attributes for translation

  - by Saosin

  Is there any way one could automatically mark all model names and attributes for translation, without specifying verbose_name/_plural on each one of them? Doesn't feel very DRY to do this every time: class Profile(models.Model): length = models.IntegerField(_('length')) weight = models.IntegerField(_('weight')) favorite_movies = models.CharField(_('favorite movies'), max_length=100) favorite_quote = models.CharField(_('favorite quote'), max_length=30) religious_views = models.CharField(_('religious views'), max_length=30) political_views = models.CharField(_('political views'), max_length=30) class Meta: verbose_name = _('profile') verbose_name_plural = _('profiles')

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• Model next available primary key

  - by hrundelok

  How can i know the next free primary key of some model?

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• Loading from pickled data causes database error with new saves

  - by hibbie

  In order to save time moving data I pickled some models and dumped them to file. I then reloaded them into another database using the same exact model. The save worked fine and the objects kept their old id which is what I wanted. However, when saving new objects I run into nextval errors. Not being very adept with postgres, I'm not sure how to fix this so I can keep old records with their existing ID while being able to continue adding new data. Thanks, Thomas

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• How to display more things in admin.StackedInline

  - by FurtiveFelon

  Hi all, I have Article model and a Comment model. Comment is created in admin.py as admin.StackedInline, and it has several fields, notably content and lastUpdate. For lastUpdate, i have specified as follows: lastUpdate = models.DateTimeField('last update', auto_now=True). Understandably, lastUpdate is not displayed when i try to add new comment (or edit old ones). However, i would like it to display for older comments if possible, as a read only thing. Is there anyway of accomplishing that? Thanks a lot! Jason

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• Extending a form field to add new validations.

  - by duallain

  I've written an app that uses forms to collect information that is then sent in an email. Many of these forms have a filefield used to attach files to the email. I'd like to validate two things, the size of the file (to ensure the emails are accepted by our mail server. I'd also like to check the file extension, to discourage attaching file types not useable for our users. (This is the python class I'm trying to extend) class FileField(Field): widget = FileInput default_error_messages = { 'invalid': _(u"No file was submitted. Check the encoding type on the form."), 'missing': _(u"No file was submitted."), 'empty': _(u"The submitted file is empty."), 'max_length': _(u'Ensure this filename has at most %(max)d characters (it has %(length)d).'), } def __init__(self, *args, **kwargs): self.max_length = kwargs.pop('max_length', None) super(FileField, self).__init__(*args, **kwargs) def clean(self, data, initial=None): super(FileField, self).clean(initial or data) if not self.required and data in EMPTY_VALUES: return None elif not data and initial: return initial # UploadedFile objects should have name and size attributes. try: file_name = data.name file_size = data.size except AttributeError: raise ValidationError(self.error_messages['invalid']) if self.max_length is not None and len(file_name) > self.max_length: error_values = {'max': self.max_length, 'length': len(file_name)} raise ValidationError(self.error_messages['max_length'] % error_values) if not file_name: raise ValidationError(self.error_messages['invalid']) if not file_size: raise ValidationError(self.error_messages['empty']) return data

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• HttpResponseRedirect question

  - by Hulk

  Cant we send a dictionary variable when using HttpResponseRedirect render_to_response('edited/display.html',context_instance=RequestContext(request,{'newlist': newlist})) //How can the dictionary and the request sent back again //sumthing like this return HttpResponseRedirect('edited/display.html',context_instance=RequestContext(request,{'newlist': newlist}))

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• passing an argument to a custom save() method

  - by Nick

  How do I pass an argument to my custom save method, preserving proper *args, **kwargs for passing to te super method? I was trying something like: form.save(my_value) and def save(self, my_value=None, *args, **kwargs): super(MyModel, self).save(*args, **kwargs) print my_value But this doesn't seem to work. What am I doing wrong?

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• Get value of selected field from a dropdown list

  - by 47

  I have this class in my model: class ServiceCharge(models.Model): name = models.CharField(max_length=30) amount = models.PositiveIntegerField() extends_membership = models.BooleanField(default=False) def __unicode__(self): return str(self.name) What I want to have is in the form for charging users a service charge, when a charge is selected from the dropdown menu, the two values for amount and extends_membership are updated on the form depending on the selected charge. My forms.py: class vModelChoiceField(forms.ModelChoiceField): def label_from_instance(self, obj): return "%s" % obj.name class PayServiceChargeForm(PaymentsForm): service_charge = vModelChoiceField(queryset=ServiceCharge.objects.all(), empty_label=" ") class Meta(PaymentsForm.Meta): exclude = ('member', 'payment_type', 'transacted_by', 'description') Then the form template: <table border="0"> <tr> <td><strong>{% trans "Service Charge" %}</strong></td> <td>{{ form.service_charge }}</td> <td><strong>{% trans "Extends Membership" %}</strong></td> <td>{{ form.extends_membership }}</td> </tr> <tr> <td valign="top"><strong>{% trans "Expiry Date" %}</strong></td> <td valign="top">{{ form.expiry_date }}</td> <td valign="top"><strong>{% trans "Amount" %}</strong></td> <td>{{ form.amount }}</td> </tr> </table> I was trying out some jQuery but I got stuck after getting the currently selected charge: <script type="text/javascript"> $(document).ready(function(){ $("#id_service_charge").change(onSelectChange); }); function onSelectChange(){ var selected = $("#id_service_charge option:selected"); var output = ""; if(selected.val() != 0){ charge = selected.val(); .... (update values) .... } } </script>

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• Post and Comment with the same Model.

  - by xRobot

  I have created a simple project where everyone can create one or more Blog. I want to use this models for Post and for Comment: class Post_comment(models.Model): content_type = models.ForeignKey(ContentType) object_id = models.PositiveIntegerField(_('object ID')) content_object = generic.GenericForeignKey() # Hierarchy Field parent = models.ForeignKey('self', null=True, blank=True, default=None, related_name='children') # User Field user = models.ForeignKey(User) # Date Fields date_submitted = models.DateTimeField(_('date/time submitted'), default = datetime.now) date_modified = models.DateTimeField(_('date/time modified'), default = datetime.now) title = models.CharField(_('title'), max_length=60, blank=True, null=True) post_comment = models.TextField(_('post_comment')) markup = models.IntegerField(choices=MARKUP_CHOICES, default=DEFAULT_MARKUP, null=True, blank=True) if it is a comment the parent is not null. So in most case the text field will contain a little bit of text. Can I use this model for both Post and Comment ?

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• How to design model for multi-tiered data?

  - by Chris

  Say I have three types of object: Area, Subarea and Topic. I want to be able to display an Area, which is just a list of Subareas and the Topics contained in those Subareas. I never want to be able to display Subareas separately - they're just for breaking up the Topics. Topics can, however, appear in multiple Areas (but probably under the same Subarea). How would I design a model for this? I could use ForeignKey from Topic to Subarea and from Subarea to Area, but it seems unnecessarily complex given that I never want to interact with subareas themselves. Also, none of these objects are ever altered or added to by the user. They're just for me to represent information. Maybe there is a better way to represent it all?

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• URL redirection if wrong url

  - by xRobot

  I have this method in my book model: def get_absolute_url(self): return "/book/%s/%s/%i/%i/" % ( self.book_title, self.book_editor, self.book_pages, self.id) So the urls of each book are like this: example.com/book/the-bible/gesu-crist/938/12/ I want that if there is an error in the url, then I get redirected to the real url by using book.id in the end of the url. For example if I go to: example.com/book/A-bible/gesu-crist/938/12/ the I will get redirected to: example.com/book/the-bible/gesu-crist/938/12/ How can I do that ?

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• ManyToManyField error when having recursive structure. How to solve it?

  - by luc

  Hello, I have the following table in the model with a recursive structure (a page can have children pages) class DynamicPage(models.Model): name = models.CharField("Titre",max_length=200) parent = models.ForeignKey('self',null=True,blank=True) I want to create another table with manytomany relation with this one: class UserMessage(models.Model): name = models.CharField("Nom", max_length=100) page = models.ManyToManyField(DynamicPage) The generated SQL creates the following constraint: ALTER TABLE `website_dynamicpage` ADD CONSTRAINT `parent_id_refs_id_29c58e1b` FOREIGN KEY (`parent_id`) REFERENCES `website_dynamicpage` (`id`); I would like to have the ManyToMany with the page itself (the id) and not with the parent field. How to modify the model to make the constraint using the id and not the parent? Thanks in advance

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• How to set title and class in the HTML for the options of a ModelChoiceField?

  - by celopes

  I have a model class MyModel(models.Model): name = models.CharField(max_length=80, unique=True) parent = models.ForeignKey('self', null=True, blank=True) I want to render a ModelChoiceField for that model that looks like: <select name="mymodel" id="id_mymodel"> <option value="1" title="Value 1" class="">Value 1</option> <option value="2" title="Value 2" class="Value 1">Value 2</option> </select> The differences between this output and the default output for a ModelChoiceField are the title and class elements in the OPTION tag. They don't exist in ModelChoiceField's default output. For my purposes: The title element is supposed to be the Option Name. The class element is supposed to be self.parent.name. (this is my problem) So, in the HTML snippet above, Value 1 has no parent and Value 2 has a parent of Value 1. What is the best mechanism to change ModelChoiceField's default HTML output? EDIT: I understand how to create a new Widget for rendering HTML. The problem is how to render a value from the underlying model in each of the options.

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• How to save links in TextFields

  - by xRobot

  I have a simple Blog model with a TextField. What is the best way to save links in the TextField ? 1) Saving link in the database in this form: http://www.example.com and then using some filter in the template to trasform it in form: <a rel="nofollow" href="http://www.example.com>http://www.example.com</a> 2) Saving link in the database directly in this form: <a rel="nofollow" href="http://www.example.com>http://www.example.com</a>

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• How retrieve first 6 element in the template

  - by xRobot

  In my template I have this for loop: {% for member in blog.members.all %} {{ member.first_name }} {% endfor %} Is there a way to retrieve only the first 10 members and not all the members ?

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• Best Practice for Context Processors vs. Template Tags?

  - by mawimawi

  In which cases is it better to create template tags (and load them into the template), than creating a context processor (which fills the request automatically)? e.g. I have a dynamic menu that has to be included into all templates, so I'm putting it into my base.html. What is the preferred usage: context processor or custom template tag? And why?

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• Getting the last member of a group on an intermediary M2M

  - by rh0dium

  If we look at the existing docs, what is the best way to get the last member added? This is similar to this but what I want to do is to be able to do this. group = Group.objects.get(id=1) group.get_last_member_added() #This is by ('-date_added') <Person: FOO> I think the best way is through a manager but how do you do this on an intermediary model? class Person(models.Model): name = models.CharField(max_length=128) def __unicode__(self): return self.name class Group(models.Model): name = models.CharField(max_length=128) members = models.ManyToManyField(Person, through='Membership') def __unicode__(self): return self.name class Membership(models.Model): person = models.ForeignKey(Person) group = models.ForeignKey(Group) date_joined = models.DateField() invite_reason = models.CharField(max_length=64)

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• What is an alternative to eval in this situation?

  - by CppLearner

  Many of my view functions do similar things. For the most part, they reverse to a different views upon clicking a button / a text link. So I wrote a helper function render_reverse def render_reverse(f, args): # args are all string type return eval('reverse(' + f + ', ' + args + ')' ) eval is a bad practice, and is pretty slow. It takes 3 seconds to start redirecting, whereas calling reverse directly takes less than 1 second to start redirecting. What alternative do I have? By the way, the function above doesn't work properly. I was modelling after this line (which works) eval('reverse("homepage", args=["abcdefg"])') Thanks.

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• Select_related() backwards relation - auto model population

  - by Nick

  Hi. If I have the following model: class Contact(models.Model) name = models.CharField(max_length=100) ... class ContactAddress(models.Model) line1 = models.CharField(max_length=100) line2 = models.CharField(max_length=100) ... contact = models.ForeignKey(Contact) I now want to grab all Contacts and for the address to be auto populated. What would be the best way to do this? The only way I have found so far is to filter out the Contacts I want and loop around each contact and assign this to Contact.addresses. I then use this for outputting each Contacts address within a template. Is there a better way of doing this? Select_related() almost does what I want, but doesn't seem to be able to work in the opposite direction. Thanks in advance for your help on this one!

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• What are the requirements for gettings django translations to work?

  - by Espen Christensen

  Hi, I am hosting several djangosites on a CentOS 5 box. But I'm having difficulties with translations. So first i had to upgrade the gettext package from 0.14 to 0.16, but that didn't help. Now i can make and compile tranlsations files with the managment commands, but the translations does not show. I am sure that the translation files are located at the right place since they work with the same setup on a local installation, and django's own translation files does not work. (e.g the admin is not translated). What could i be missing in my server setup that makes this happen?

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• Painless deployment of a Django app (port from Drupal). Do I have to switch to a VPS?

  - by Monden

  I'm about to complete porting my Drupal based community site to Django. My Drupal site is hosted at a shared hosting (Dreamhost) for last 4 years, and stability & performance has been satisfactory. The site gets around 5k unique visitors with 70-80k page views a day. This will be my first deployment of a Django application and I'm not comfortable with managing my own VPS. I use Ubuntu as a dev. server, but I don't have experience with it at the production env. I have an unrelated internal CRM app (Django) that I host with Webfaction. However security and performance isn't an issue as it's only accessed by 5 people. Unfortunately, I don't have much time to learn and maintain a VPS at this moment. I would like to know if I can host a site with this much traffic at Webfaction's shared environment? How would performance differ in comparison to Linode or Slicehost? Google AppEngine isn't an option at the moment as I'll be using my current Postgresql database.

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• How to run django on localhost with nginx and uwsgi?

  - by user2426362

  How to run django on localhost with nginx and uwsgi? This im my config but not works. nginx: server { listen 80; server_name localhost; access_log /var/log/nginx/localhost_access.log; error_log /var/log/nginx/localhost_error.log; location / { uwsgi_pass unix:///tmp/localhost.sock; include uwsgi_params; } location /media/ { alias /home/user/projects/zt/myproject/myproject/media/; } location /static/ { alias /home/user/projects/zt/myproject/myproject/static/; } } uwsgi: [uwsgi] vhost = true plugins = python socket = /tmp/localhost.sock master = true enable-threads = true processes = 2 wsgi-file = /home/user/projects/zt/myproject/myproject/wsgi.py virtualenv = /home/user/projects/zt chdir = /home/user/projects/zt/myproject touch-reload = /home/user/projects/zt/myproject/reload This config work on my ubuntu server with normal domain (not localhost) but on localhost not working. If I run localhost in web browser I have Welcome to nginx!

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