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• Testing a Django view cause "AttributeError: 'NoneType' object has no attribute 'handler500'" error

  - by jack

  I just wanted to start testing a Django view using the code below: from django.test.client import Client c = Client() response = c.get('/search/keyword') print response.content It just throws out following error message: "/usr/local/lib/python2.6/dist-packages/django/test/client.py", line 286, in get response = self.request(**r) File "/usr/local/lib/python2.6/dist-packages/django/test/client.py", line 230, in request response = self.handler(environ) File "/usr/local/lib/python2.6/dist-packages/django/test/client.py", line 74, in __call__ response = self.get_response(request) File "/usr/local/lib/python2.6/dist-packages/django/core/handlers/base.py", line 143, in get_response return self.handle_uncaught_exception(request, resolver, exc_info) File "/usr/local/lib/python2.6/dist-packages/django/core/handlers/base.py", line 178, in handle_uncaught_exception callback, param_dict = resolver.resolve500() File "/usr/local/lib/python2.6/dist-packages/django/core/urlresolvers.py", line 268, in resolve500 return self._resolve_special('500') File "/usr/local/lib/python2.6/dist-packages/django/core/urlresolvers.py", line 258, in _resolve_special callback = getattr(self.urlconf_module, 'handler%s' % view_type) AttributeError: 'NoneType' object has no attribute 'handler500' The view works in browser. What's wrong with above code?

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• How do I mock a custom field that is deleted so that south migrations run?

  - by muhuk

  I have removed an app that contained a couple of custom fields from my project. Now when I try to run my migrations I get ImportError, naturally. These fields were very basic customizations like below: from django.db.models.fields import IntegerField class SomeField(IntegerField): def get_internal_type(self): return "SomeField" def db_type(self, connectio=None): return 'integer' def clean(self, value): # some custom cleanup pass So, none of them contain any database level customizations. When I removed this code, I've created migrations so the subsequent migration all ran fine. But when I try to run them on a pre-deletion database I realized my mistake. I can re-create a bare-bones app and make these imports work, but Ideally I would like to know if South has a mechanism to resolve these issues? Or is there any best practises? It would be cool if I could solve these issues just by modifying my migrations and not touching the codebase. (Django 1.3, South 0.7.3)

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• django threadedcomments

  - by Patrick

  Hi folks, I would like to setup a comment systems on my site, using django threadedcomments, and I follow all the steps in the Tutorial, however, I get the following error: No module named newforms.util I am not sure what causing this issue, here is my configuration: #settings.py INSTALLED_APPS = ( 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'myproject.myapp', 'threadedcomments', ) #urls.py from django.conf import settings from django.conf.urls.defaults import * from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', (r'^admin/', include(admin.site.urls)), (r'^threadedcomments/', include('threadedcomments.urls')), ) Please let me know if there is another better choice for commenting, as long as the comment system is flexible and able to do lot of customization, as well as threadedcomment, of coz, integrating with Rating, I am happy to use the other one. Thanks guys.

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• The Business case for Big Data

  - by jasonw

  The Business Case for Big Data Part 1 What's the Big Deal Okay, so a new buzz word is emerging. It's gone beyond just a buzzword now, and I think it is going to change the landscape of retail, financial services, healthcare....everything. Let me spend a moment to talk about what i'm going to talk about. Massive amounts of data are being collected every second, more than ever imaginable, and the size of this data is more than can be practically managed by today’s current strategies and technologies. There is a revolution at hand centering on this groundswell of data and it will change how we execute our businesses through greater efficiencies, new revenue discovery and even enable innovation. It is the revolution of Big Data. This is more than just a new buzzword is being tossed around technology circles.This blog series for Big Data will explain this new wave of technology and provide a roadmap for businesses to take advantage of this growing trend. Cases for Big Data There is a growing list of use cases for big data. We naturally think of Marketing as the low hanging fruit. Many projects look to analyze twitter feeds to find new ways to do marketing. I think of a great example from a TED speech that I recently saw on data visualization from Facebook from my masters studies at University of Virginia. We can see when the most likely time for breaks-ups occurs by looking at status changes and updates on users Walls. This is the intersection of Big Data, Analytics and traditional structured data. Ted Video Marketers can use this to sell more stuff. I really like the following piece on looking at twitter feeds to measure mood. The following company was bought by a hedge fund. They could predict how the S&P was going to do within three days at an 85% accuracy. Link to the article Here we see a convergence of predictive analytics and Big Data. So, we'll look at a lot of these business cases and start talking about what this means for the business. It's more than just finding ways to use Hadoop + NoSql and we'll talk about that too. How do I start in Big Data? That's what is coming next post.

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• Auto filling polymorphic table on save or on delete in django

  - by Mo J. Mughrabi

  Hi, Am working on an project in which I made an app "core" it will contain some of the reused models across my projects, most of those are polymorphic models (Generic content types) and will be linked to different models. Example below am trying to create audit model and will be linked to several models which may require auditing. This is the polls/models.py from django.db import models from django.contrib.auth.models import User from core.models import * from django.contrib.contenttypes import generic class Poll(models.Model): ## TODO: Document question = models.CharField(max_length=300) question_slug=models.SlugField(editable=False) start_poll_at = models.DateTimeField(null=True) end_poll_at = models.DateTimeField(null=True) is_active = models.BooleanField(default=True) audit_obj=generic.GenericRelation(Audit) def __unicode__(self): return self.question class Choice(models.Model): ## TODO: Document choice = models.CharField(max_length=200) poll=models.ForeignKey(Poll) audit_obj=generic.GenericRelation(Audit) class Vote(models.Model): ## TODO: Document choice=models.ForeignKey(Choice) Ip_Address=models.IPAddressField(editable=False) vote_at=models.DateTimeField("Vote at", editable=False) here is the core/modes.py from django.db import models from django.contrib.auth.models import User from django.contrib.contenttypes.models import ContentType from django.contrib.contenttypes import generic class Audit(models.Model): ## TODO: Document # Polymorphic model using generic relation through DJANGO content type created_at = models.DateTimeField("Created at", auto_now_add=True) created_by = models.ForeignKey(User, db_column="created_by", related_name="%(app_label)s_%(class)s_y+") updated_at = models.DateTimeField("Updated at", auto_now=True) updated_by = models.ForeignKey(User, db_column="updated_by", null=True, blank=True, related_name="%(app_label)s_%(class)s_y+") content_type = models.ForeignKey(ContentType) object_id = models.PositiveIntegerField(unique=True) content_object = generic.GenericForeignKey('content_type', 'object_id') and here is polls/admin.py from django.core.context_processors import request from polls.models import Poll, Choice from core.models import * from django.contrib import admin class ChoiceInline(admin.StackedInline): model = Choice extra = 3 class PollAdmin(admin.ModelAdmin): inlines = [ChoiceInline] admin.site.register(Poll, PollAdmin) Am quite new to django, what am trying to do here, insert a record in audit when a record is inserted in polls and then update that same record when a record is updated in polls.

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• Sumproduct using Django's aggregation

  - by Matthew Rankin

  Question Is it possible using Django's aggregation capabilities to calculate a sumproduct? Background I am modeling an invoice, which can contain multiple items. The many-to-many relationship between the Invoice and Item models is handled through the InvoiceItem intermediary table. The total amount of the invoice—amount_invoiced—is calculated by summing the product of unit_price and quantity for each item on a given invoice. Below is the code that I'm currently using to accomplish this, but I was wondering if there is a better way to handle this using Django's aggregation capabilities. Current Code class Item(models.Model): item_num = models.SlugField(unique=True) description = models.CharField(blank=True, max_length=100) class InvoiceItem(models.Model): item = models.ForeignKey(Item) invoice = models.ForeignKey('Invoice') unit_price = models.DecimalField(max_digits=10, decimal_places=2) quantity = models.DecimalField(max_digits=10, decimal_places=4) class Invoice(models.Model): invoice_num = models.SlugField(max_length=25) invoice_items = models.ManyToManyField(Item,through='InvoiceItem') def _get_amount_invoiced(self): invoice_items = self.invoiceitem_set.all() amount_invoiced = 0 for invoice_item in invoice_items: amount_invoiced += (invoice_item.unit_price * invoice_item.quantity) return amount_invoiced amount_invoiced = property(_get_amount_invoiced)

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• How to implement full text search in Django?

  - by Jannis

  I would like to implement a search function in a django blogging application. The status quo is that I have a list of strings supplied by the user and the queryset is narrowed down by each string to include only those objects that match the string. See: if request.method == "POST": form = SearchForm(request.POST) if form.is_valid(): posts = Post.objects.all() for string in form.cleaned_data['query'].split(): posts = posts.filter( Q(title__icontains=string) | Q(text__icontains=string) | Q(tags__name__exact=string) ) return archive_index(request, queryset=posts, date_field='date') Now, what if I didn't want do concatenate each word that is searched for by a logical AND but with a logical OR? How would I do that? Is there a way to do that with Django's own Queryset methods or does one have to fall back to raw SQL queries? In general, is it a proper solution to do full text search like this or would you recommend using a search engine like Solr, Whoosh or Xapian. What are there benefits? Thanks for taking the time

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• django-rest-framework: api versioning

  - by w--

  so googling around it appears that the general consensus is that embedding version numbers in REST URIs is a bad practice and a bad idea. even on SO there are strong proponents supporting this. e.g. Best practices for API versioning? My question is about how to accomplish the proposed solution of using the accept header / content negotiation in the django-rest-framework to accomplish this. It looks like content negotiation in the framework, http://django-rest-framework.org/api-guide/content-negotiation.html is already configured to automatically return intended values based on accepted MIME types. If I start using the Accept header for custom types, I'll lose this benefit of the framework. Is there a better way to accomplish this in the framework?

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• Django URL resolving infrastructure stops working

  - by btol45

  We recently launched a new Django-powered website, and we are experiencing the oddest bug: The site is running under Apache with mod_fastcgi. Everything works fine for a while, and then the URL tag and reverse() functionality stops working. Instead of returning the expected URL, they return "". We haven't noticed anything in Apache's log file; there are no errors being generated by Django. And (the kicker) the problem only occurs in production mode; we can't reproduce it when DEBUG=True. Any thoughts on where we should be looking for the problem?

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• Inline editing of ManyToMany relation in Django

  - by vorpyg

  After working through the Django tutorial I'm now trying to build a very simple invoicing application. I want to add several Products to an Invoice, and to specify the quantity of each product in the Invoice form in the Django admin. Now I've to create a new Product object if I've got different quantites of the same Product. Right now my models look like this (Company and Customer models left out): class Product(models.Model): description = models.TextField() quantity = models.IntegerField() price = models.DecimalField(max_digits=10,decimal_places=2) tax = models.ForeignKey(Tax) class Invoice(models.Model): company = models.ForeignKey(Company) customer = models.ForeignKey(Customer) products = models.ManyToManyField(Product) invoice_no = models.IntegerField() invoice_date = models.DateField(auto_now=True) due_date = models.DateField(default=datetime.date.today() + datetime.timedelta(days=14)) I guess the quantity should be left out of the Product model, but how can I make a field for it in the Invoice model?

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• Django Admin interface with pickled set

  - by Rosarch

  I have a model that has a pickled set of strings. (It has to be pickled, because Django has no built in set field, right?) class Foo(models.Model): __bar = models.TextField(default=lambda: cPickle.dumps(set()), primary_key=True) def get_bar(self): return cPickle.loads(str(self.__bar)) def set_bar(self, values): self.__bar = cPickle.dumps(values) bar = property(get_bar, set_bar) I would like the set to be editable in the admin interface. Obviously the user won't be working with the pickled string directly. Also, the interface would need a widget for adding/removing strings from a set. What is the best way to go about doing this? I'm not super familiar with Django's admin system. Do I need to build a custom admin widget or something? Update: If I do need a custom widget, this looks helpful: http://www.fictitiousnonsense.com/archives/22

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• Django South Foreign Keys referring to pks with Custom Fields

  - by Rory Hart

  I'm working with a legacy database which uses the MySQL big int so I setup a simple custom model field to handle this: class BigAutoField(models.AutoField): def get_internal_type(self): return "BigAutoField" def db_type(self): return 'bigint AUTO_INCREMENT' # Note this won't work with Oracle. This works fine with django south for the id/pk fields (mysql desc "| id | bigint(20) | NO | PRI | NULL | auto_increment |") but the ForeignKey fields in other models the referring fields are created as int(11) rather than bigint(20). I assume I have to add an introspection rule to the BigAutoField but there doesn't seem to be a mention of this sort of rule in the documentation (http://south.aeracode.org/docs/customfields.html). Update: Currently using Django 1.1.1 and South 0.6.2

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• Django , Break Page like wordpress Break Page?

  - by Asinox

  Hi guys, there is any way to make a Break Page with django for using with large articles? thanks

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• Django - categories & sub-categories

  - by Bluey

  Some advice needed on how I can structure my models for my site. I have seen this post from Django project but still a little lost. Also come across Django-MPTT - but that's no help and possibly overkill. I'm looking to have categories & subcategories that are shown in the URLs like this: mysite.com/Level1/Maths/Calculations/Addition/ mysite.com/Level3/English/ mysite.com/Level2/English/Storytelling/ In my admin interface I'm looking to have drop downs for each level of category or subcategory. Also at each level I will be querying items (another model) like get all items that have the category 'Level1' AND 'Maths'. There could also be a situation where I have five or more subcategories. How is it best to create my models for best performance? It it worth using tagging instead?

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• django 'if' statement improperly formatted

  - by Zayatzz

  Im getting strangest error in django so far: 'if' statement improperly formatted Template that raises the error is this: {% if diff >= 0 %} <span class="pos">+{{ diff }} {% else %} <span class="neg">-{{ diff }} {% endif %} </span> <span>{{ a }}</span> view that has a and diff in context is this: def add(request, kaart_id): if request.is_ajax() and request.method == 'POST': x = Kaart.objects.get(id=kaart_id) x.pos += 1 x.save x = Kaart.objects.get(id=kaart_id) from django.utils import simplejson diff = x.pos - x.neg a = "(+1)" context = { 'diff':diff, 'a':a } return render_to_response('sum.html', context, context_instance=RequestContext(request)) It does not matter what equation i use in if, , =, ==.. they all raise the same error. and as far as i can tell its all by the book: http://docs.djangoproject.com/en/dev/ref/templates/builtins/#id5 Alan.

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• error about django to connecct newes mssql2008

  - by qq263020776

  I am using django-mssql and SQL Server 2008, but I found that it always errors when I do some commands,for example: python manage.py syncdb the error is below: raise OperationalError(e, "Error opening connection: " + connection_string) ngo.db.backends.sqlserver_ado.dbapi.OperationalError: (com_error(-2147352567, xb7\xa2\xc9\xfa\xd2\xe2\xcd\xe2\xa1\xa3', (0, u'Microsoft OLE DB Provider for L Server', u'[DBNETLIB][ConnectionOpen (Connect()).]SQL Server \u4e0d \u5b58\u 8\u6216\u62d2\u7edd\u8bbf\u95ee\u3002', None, 0, -2147467259), None), 'Error ning connection: PROVIDER=SQLOLEDB;DATA SOURCE=115.238.106.100,60433;Network rary=DBMSSOCN;Initial Catalog=rvdb_1;UID=sa;PWD=xxxx') When I use Microsoft SQL Server Management studio client, I can successfully connect the database. I got some infomation from: http://code.google.com/p/django-mssql/issues/detail?id=76 but I still tried I got wrong and I think the solution provided is wrong.

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• Error connecting to SQL Server 2008 with Django

  - by qq263020776

  I am using django-mssql and SQL Server 2008, but I found that it always errors when I do some commands,for example: python manage.py syncdb the error is below: raise OperationalError(e, "Error opening connection: " + connection_string) ngo.db.backends.sqlserver_ado.dbapi.OperationalError: (com_error(-2147352567, xb7\xa2\xc9\xfa\xd2\xe2\xcd\xe2\xa1\xa3', (0, u'Microsoft OLE DB Provider for L Server', u'[DBNETLIB][ConnectionOpen (Connect()).]SQL Server \u4e0d \u5b58\u 8\u6216\u62d2\u7edd\u8bbf\u95ee\u3002', None, 0, -2147467259), None), 'Error ning connection: PROVIDER=SQLOLEDB;DATA SOURCE=115.238.106.100,60433;Network rary=DBMSSOCN;Initial Catalog=rvdb_1;UID=sa;PWD=xxxx') When I use Microsoft SQL Server Management studio client, I can successfully connect the database. I got some infomation from: http://code.google.com/p/django-mssql/issues/detail?id=76 but I still tried I got wrong and I think the solution provided is wrong.

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• How to use sessions with django piston auth?

  - by xyld

  The problem is that I want to store authentication in a cookie that I can present to django piston rather than requiring user/password to be typed in each time (without hardcoding or storing the user/pass combo somewhere on disk). I was hoping to accomplish this with cookies like someone would without the piston API. Am I missing something? Django Piston doesn't seem to care about session cookies at all? Or can someone suggest a good alternative? Maybe I shouldn't use Piston?

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• Confusion on using django socialauth

  - by Fedor

  http://github.com/uswaretech/Django-Socialauth/tree/master/socialauth/ I'm a bit confused on how I should use this. Of course, I read the notes at the bottom but I'm a Django novice so I'll need a little hand holding. The structure of this looks like a project structure since it contains a urls.py but I'm also aware that applications can also have that. It also has a manage.py which leads me to believe it's a project ( plus the subdirectories ). So should I just be integrating portions of this into my existing project? This isn't an application, right? The README also mentions grabbing API Keys. So if I want a standard interface where you click on a google/yahoo logo and it forwards itself via Javascript to the authentication page where you login if you already aren't logged in, kicks you back to your own page, would I need API keys? Any other special tips are appreciated.

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• Django ValueError at /admin/

  - by mjaz

  Hello, I am running Django with mod_python on a Red Hat Linux box in production. A little while ago, for a reason unknown to me, the admin stopped working, throwing a 500 error. The error is as follows: ValueError at /admin/ Empty module name Request Method: GET Exception Type: ValueError Exception Value: Empty module name Exception Location: /usr/local/lib/python2.6/site-packages/django/utils/importlib.py in import_module, line 35 Python Executable: /usr/bin/python Python Version: 2.6.2 Has anyone encountered this before? I have absolutely no idea how to fix this problem. Thank you for any help.

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• Problems with contenttypes when loading a fixture in Django

  - by gerdemb

  I am having trouble loading Django fixtures into my MySQL database because of contenttypes conflicts. First I tried dumping the data from only my app like this: ./manage.py dumpdata escola > fixture.json but I kept getting missing foreign key problems, because my app "escola" uses tables from other applications. I kept adding additional apps until I got to this: ./manage.py dumpdata contenttypes auth escola > fixture.json Now the problem is the following constraint violation when I try to load the data as a test fixture: IntegrityError: (1062, "Duplicate entry 'escola-t23aluno' for key 2") It seems the problem is that Django is trying to dynamically recreate contenttypes with different primary key values that conflict with the primary key values from the fixture. This appears to be the same as bug documented here: http://code.djangoproject.com/ticket/7052 The problem is that the recommended workaround is to dump the contenttypes app which I'm already doing!? What gives? If it makes any difference I do have some custom model permissions as documented here: http://docs.djangoproject.com/en/dev/ref/models/options/#permissions

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• django model fields comparison

  - by Weiwei

  is there a way l can compare two columns | fields in django like Invoice.objects.filter(amountdue_lt=invoiceamount) where amountdue and invoiceamount are two columns of Invoice object Thanks

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• haystack's RealTimeSearchIndex causes django to hang on data entry

  - by lsc

  I'm using django-haystack and a xapian backend with real time indexing (haystack.indexes.RealTimeSearchIndexing) of model data and it works fine on my Ubuntu server. However, it causes django to hang upon data entry when I deployed the app on a RHEL5 server. Everything is hunky dory if I switch to a standard SearchIndex. Running ./manage.py rebuild_index manually works fine too. The major differences between the two setups would be the versions of Python (2.4.3 vs 2.6.4) and the xapian (1.0.4-1 vs 1.0.15). Any suggestions on what may be the problem? Nothing interesting appears in the logs, and I've tried different databases (mysql, sqlite3) and deployment methods (mod_python, wsgi) with no luck yet. I have noted the warning on the haystack docs stating that RealTimeSearchIndex is only handled gracefully with a Solr backend, however I'm running a very traffic site with only occasional writes so I'm fine with some CPU overheads on writes.

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• Django as S3 proxy

  - by schneck

  Hi there, I extended a ModelAdmin with a custom field "Download file", which is a link to a URL in my Django project, like: http://www.myproject.com/downloads/1 There, I want to serve a file which is stored in a S3-bucket. The files in the bucket are not public readable, and the user may not have direct access to it. Now I want to avoid that the file has to be loaded in the server memory (these are multi-gb-files) avoid to have temp files on the server The ideal solution would be to let django act as a proxy that streams S3-chunks directly to the user. I use boto, but did not find a possibility to stream the chunks. Any ideas? Thanks.

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• Putting a block inside another in Django

  - by hekevintran

  I have a Django template that I want to extend in multiple places. In some the div must be inside a form, and in others it must not be. To do this I put a block above and below the div so I could add and in them respectively. Desired: <form> <div class="my_div"> {% block div_content %} ... {% endblock %} </div> </form> Template: {% block div_top %}{% endblock %} <div class="my_div"> {% block div_content %} {% endblock %} </div> {% block div_bottom %}{% endblock %} Looking at this I can't help but think that there is a better way to do it. What is the standard Django way of doing this?

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