django-orm

My database has the following schema: class Product(models.Model): pass class Tag(models.Model): product = models.ForeignKey(Product) attr1 = models.CharField() attr2 = models.CharField() attr3 = models.CharField() class AlternatePartNumber(models.Model): product = models.ForeignKey(Product) In other words, a Product has many Tag s, and a Product has many AlternatePartNumber s. Tag s are a collection of attributes of the Product . Given the three attributes in a Tag , I want to select the associated Product s that match (could be more than one), as well as all of the AlternatePartNumber s of

I'm trying to call a stored procedure on a multi-db Django installation, but am not having any luck getting results. The stored procedure (which is on the secondary database) always returns an empty array in Django, but the expected result does appear when executed in a mysql client. My view.py file from SomeDBModel import models from django.db import connection def index(request, someid): #Some related django-style query that works here loc = getLocationPath(someid, 1) print(loc) def getLocationPath(id, someval): cursor = connection.cursor() cursor.callproc("SomeDB.spGetLocationPath", [id,

I'm trying to implement a filter for hour range, it should returns records with a date between hourA and hourB (ie: "give me the records saved between 16pm and 18pm"). My attempts: 1) Using new 1.6 __hour filter and __in or __range : MyModel.objects.filter(date__hour__in=(16, 17, 18)) MyModel.objects.filter(date__hour__range=(16, 18)) The code above generates exceptions 2) Using Q objects: hList = [Q(date__hour=h) for h in (16, 17, 18)] MyModel.objects.filter(reduce(operator.or_, hList)) This version works, but is very inefficient, since for each hour in the range it repeats the extract() call

I must be missing something obvious, as the behavior is not as expected for this simple requirement. Here is my model class: class Encounter(models.Model): activity_type = models.CharField(max_length=2, choices=(('ip','ip'), ('op','op'), ('ae', 'ae'))) cost = models.DecimalField(max_digits=8, decimal_places=2) I want to find the total cost for each activity type. My query is: >>> Encounter.objects.values('activity_type').annotate(Sum('cost')) Which yields: >>> [{'cost__sum': Decimal("140.00"), 'activity_type': u'ip'}, {'cost__sum': Decimal("100.00"), 'activity_type': u'op'}, {'cost__sum':

I'm making an "infinite"/continuous scrolling list (like twitter) and want to be able to navigate to a specific item. Finding the item is straight forward, but I need to get a few items before and after it. I'm using a similar approach to the answers suggested here: Getting next and previous objects in Django before = list(reversed(models.MyModel.objects.filter(pk__lt=pk).order_by('-pk')[:10])) after = list(models.MyModel.objects.filter(pk__gte=pk).order_by('pk')[:11]) objects = before + after Is there any way to combine these into the one query? I can't simply combine the two with the |