I want to serialize a model, but want to include an additional field that requires doing some database lookups on the model instance to be serialized: class FooSerializer(serializers.ModelSerializer): my_field = … # result of some database queries on the input Foo object class Meta: model = Foo fields = (‘id’, ‘name’, ‘myfield’) What is the … Read more
How do I change some models name from “Categorys” to “Categories” on admin site in the new dev django version? In the old version (whithout admin sites and admin models) you could just do this; http://www.the-dig.com/blog/post/customize-plural-name-django-admin/ However – now setting verbose_name_plural inside my modeladmin based class does nothing. Anyone encouter the same issue? 2 Answers … Read more
There is a lot of documentation on how to serialize a Model QuerySet but how do you just serialize to JSON the fields of a Model Instance? 18 Answers 18
I want to write a unit test for a Django manage.py command that does a backend operation on a database table. How would I invoke the management command directly from code? I don’t want to execute the command on the Operating System’s shell from tests.py because I can’t use the test environment set up using … Read more
I’d like to update a table with Django – something like this in raw SQL: update tbl_name set name=”foo” where name=”bar” My first result is something like this – but that’s nasty, isn’t it? list = ModelClass.objects.filter(name=”bar”) for obj in list: obj.name=”foo” obj.save() Is there a more elegant way? 7 Answers 7
I have this fields in form: city = forms.ModelChoiceField(label=”city”, queryset=MyCity.objects.all()) district = forms.ModelChoiceField(label=”district”, queryset=MyDistrict.objects.all()) area = forms.ModelChoiceField(label=”area”, queryset=MyArea.objects.all()) district comes from click on city and area comes from click on area. With queryset=MyDistrict.objects.all() and queryset=MyArea.objects.all() form will be very heavy. How can I make querysets empty by default? 2 Answers 2
Before Django 1.0 there was an easy way to get the admin url of an object, and I had written a small filter that I’d use like this: <a href=”https://stackoverflow.com/questions/694477/{{ object”admin_url }}” …. > … </a> Basically I was using the url reverse function with the view name being ‘django.contrib.admin.views.main.change_stage’ reverse( ‘django.contrib.admin.views.main.change_stage’, args=[app_label, model_name, object_id] … Read more
I want to trigger a special action in the save() method of a Django model object when I’m saving a new record (not updating an existing record.) Is the check for (self.id != None) necessary and sufficient to guarantee the self record is new and not being updated? Any special cases this might overlook? 13 … Read more
I’d like to do the following: raise HttpResponseForbidden() But I get the error: exceptions must be old-style classes or derived from BaseException, not HttpResponseForbidden How should I do this? 4 Answers 4
Ok, so this seems like a really silly thing to ask, and I’m sure I’m missing something somewhere. How do you perform a backwards migration using South on Django? So I’ve tweaked my models, created a migration with schemamigration, run the migration with migrate, and now I realise that’s not quite what I wanted and … Read more
