django-database

I am trying to make a very simple Subquery that uses OuterRef (not for practical purposes, just to get it working), but keep running into same error. posts/models.py from django.db import models class Tag(models.Model): name = models.CharField(max_length=120) def __str__(self): return self.name class Post(models.Model): title = models.CharField(max_length=120) tags = models.ManyToManyField(Tag) def __str__(self): return self.title manage.py shell code >>> from django.db.models import OuterRef, Subquery >>> from posts.models import Tag, Post >>> tag1 = Tag.objects.create(name='tag1') >>> post1

I'm using django-taggit , which handles the attachment of tags to arbitrary content types. I imported a large tag list, which contains many uppercase words, as well as lowercase words. Now, I' trying to get objects of another class containing a set of tags, but I want to compare case insensitively. When I do this: Media.objects.filter(tags__name__in=['tag1', 'tag2']) objects containing e.g. the tag "Tag1" are not found, only those ones with "tag1" or "tag2". Is there any possibility in the django orm to do something like: Media.objects.filter(tags__name__iin=['tag1', 'tag2']) that acts like

I'm building a csv import form for my Django application and want to display the to-be-imported rows in a ModelFormSet for validational purposes. Therefore I added a view to the relevant ModelAdmin which reads the lines from the csv and prints a ModelFormSet(queryset=an_empty_queryset, initial={data_from_the_csv}) . The problem is that the model references three other models via ForeignKey fields and for each field in each form in the formset a database query is issued in order to populate the ModelChoiceField 's options. Why doesn't Django cache the form (as it is used several times) or is

I am writing a multi-tenant application with python-django. I want to set database connection based on each request.I thought i could write a middleware where we set the database to be used for that particular database. import re from django.db import connections class SetTenantDatabase(object): def process_request(self, request): pattern = re.compile("\\b(http://|https://|www.|.com|8000|:|//)\\W\\d+", re.I) words = request.get_host() db_name = [pattern.sub("", words)][0].split('.')[0] connections.databases['new-alias'] = { 'default': { 'ENGINE': 'django.db.backends.postgresql_psycopg2', 'NAME

Is there a way to specify that a model (or app, even) should only ever use one particular database? I am working with a legacy database that I don't want to change. I have two databases - the 'default' is an sqlite one that could be used for admin etc, and the legacy one. I used inspectdb to create a model for (part of) the legacy database, and it has managed = False . But is there a way to specify in the model itself that it only applies to a particular database? I see that you can specify using=databasename in some query sets etc but this is no good for things like Databrowse (and possibly

I am trying to create a view where I save an object but I'd like to undo that save if some exception is raised. This is what I tried: class MyView(View): @transation.atomic def post(self, request, *args, **kwargs): try: some_object = SomeModel(...) some_object.save() if something: raise exception.NotAcceptable() # When the workflow comes into this condition, I think the previous save should be undome # Whant am I missing? except exception.NotAcceptable, e: # do something What am I doing wrong? even when the exception is raised some_object is still in DataBase. Atomicity Documentation To