252 lines
13 KiB
Python
252 lines
13 KiB
Python
# coding: utf-8
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from django.db import models
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from django.conf import settings
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try:
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sorted
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except NameError:
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from django.utils.itercompat import sorted # For Python 2.3
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class Author(models.Model):
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name = models.CharField(max_length=100)
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age = models.IntegerField()
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friends = models.ManyToManyField('self', blank=True)
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def __unicode__(self):
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return self.name
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class Publisher(models.Model):
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name = models.CharField(max_length=300)
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num_awards = models.IntegerField()
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def __unicode__(self):
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return self.name
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class Book(models.Model):
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isbn = models.CharField(max_length=9)
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name = models.CharField(max_length=300)
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pages = models.IntegerField()
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rating = models.FloatField()
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price = models.DecimalField(decimal_places=2, max_digits=6)
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authors = models.ManyToManyField(Author)
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contact = models.ForeignKey(Author, related_name='book_contact_set')
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publisher = models.ForeignKey(Publisher)
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pubdate = models.DateField()
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class Meta:
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ordering = ('name',)
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def __unicode__(self):
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return self.name
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class Store(models.Model):
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name = models.CharField(max_length=300)
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books = models.ManyToManyField(Book)
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original_opening = models.DateTimeField()
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friday_night_closing = models.TimeField()
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def __unicode__(self):
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return self.name
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#Extra does not play well with values. Modify the tests if/when this is fixed.
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__test__ = {'API_TESTS': """
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>>> from django.core import management
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>>> from django.db.models import get_app, F
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# Reset the database representation of this app.
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# This will return the database to a clean initial state.
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>>> management.call_command('flush', verbosity=0, interactive=False)
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>>> from django.db.models import Avg, Sum, Count, Max, Min, StdDev, Variance
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# Ordering requests are ignored
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>>> Author.objects.all().order_by('name').aggregate(Avg('age'))
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{'age__avg': 37.4...}
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# Implicit ordering is also ignored
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>>> Book.objects.all().aggregate(Sum('pages'))
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{'pages__sum': 3703}
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# Baseline results
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>>> Book.objects.all().aggregate(Sum('pages'), Avg('pages'))
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{'pages__sum': 3703, 'pages__avg': 617.1...}
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# Empty values query doesn't affect grouping or results
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>>> Book.objects.all().values().aggregate(Sum('pages'), Avg('pages'))
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{'pages__sum': 3703, 'pages__avg': 617.1...}
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# Aggregate overrides extra selected column
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>>> Book.objects.all().extra(select={'price_per_page' : 'price / pages'}).aggregate(Sum('pages'))
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{'pages__sum': 3703}
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# Annotations get combined with extra select clauses
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>>> sorted(Book.objects.all().annotate(mean_auth_age=Avg('authors__age')).extra(select={'manufacture_cost' : 'price * .5'}).get(pk=2).__dict__.items())
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[('contact_id', 3), ('id', 2), ('isbn', u'067232959'), ('manufacture_cost', ...11.545...), ('mean_auth_age', 45.0), ('name', u'Sams Teach Yourself Django in 24 Hours'), ('pages', 528), ('price', Decimal("23.09")), ('pubdate', datetime.date(2008, 3, 3)), ('publisher_id', 2), ('rating', 3.0)]
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# Order of the annotate/extra in the query doesn't matter
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>>> sorted(Book.objects.all().extra(select={'manufacture_cost' : 'price * .5'}).annotate(mean_auth_age=Avg('authors__age')).get(pk=2).__dict__.items())
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[('contact_id', 3), ('id', 2), ('isbn', u'067232959'), ('manufacture_cost', ...11.545...), ('mean_auth_age', 45.0), ('name', u'Sams Teach Yourself Django in 24 Hours'), ('pages', 528), ('price', Decimal("23.09")), ('pubdate', datetime.date(2008, 3, 3)), ('publisher_id', 2), ('rating', 3.0)]
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# Values queries can be combined with annotate and extra
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>>> sorted(Book.objects.all().annotate(mean_auth_age=Avg('authors__age')).extra(select={'manufacture_cost' : 'price * .5'}).values().get(pk=2).items())
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[('contact_id', 3), ('id', 2), ('isbn', u'067232959'), ('manufacture_cost', ...11.545...), ('mean_auth_age', 45.0), ('name', u'Sams Teach Yourself Django in 24 Hours'), ('pages', 528), ('price', Decimal("23.09")), ('pubdate', datetime.date(2008, 3, 3)), ('publisher_id', 2), ('rating', 3.0)]
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# The order of the values, annotate and extra clauses doesn't matter
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>>> sorted(Book.objects.all().values().annotate(mean_auth_age=Avg('authors__age')).extra(select={'manufacture_cost' : 'price * .5'}).get(pk=2).items())
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[('contact_id', 3), ('id', 2), ('isbn', u'067232959'), ('manufacture_cost', ...11.545...), ('mean_auth_age', 45.0), ('name', u'Sams Teach Yourself Django in 24 Hours'), ('pages', 528), ('price', Decimal("23.09")), ('pubdate', datetime.date(2008, 3, 3)), ('publisher_id', 2), ('rating', 3.0)]
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# A values query that selects specific columns reduces the output
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>>> sorted(Book.objects.all().annotate(mean_auth_age=Avg('authors__age')).extra(select={'price_per_page' : 'price / pages'}).values('name').get(pk=1).items())
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[('mean_auth_age', 34.5), ('name', u'The Definitive Guide to Django: Web Development Done Right')]
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# The annotations are added to values output if values() precedes annotate()
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>>> sorted(Book.objects.all().values('name').annotate(mean_auth_age=Avg('authors__age')).extra(select={'price_per_page' : 'price / pages'}).get(pk=1).items())
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[('mean_auth_age', 34.5), ('name', u'The Definitive Guide to Django: Web Development Done Right')]
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# Check that all of the objects are getting counted (allow_nulls) and that values respects the amount of objects
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>>> len(Author.objects.all().annotate(Avg('friends__age')).values())
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9
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# Check that consecutive calls to annotate accumulate in the query
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>>> Book.objects.values('price').annotate(oldest=Max('authors__age')).order_by('oldest', 'price').annotate(Max('publisher__num_awards'))
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[{'price': Decimal("30..."), 'oldest': 35, 'publisher__num_awards__max': 3}, {'price': Decimal("29.69"), 'oldest': 37, 'publisher__num_awards__max': 7}, {'price': Decimal("23.09"), 'oldest': 45, 'publisher__num_awards__max': 1}, {'price': Decimal("75..."), 'oldest': 57, 'publisher__num_awards__max': 9}, {'price': Decimal("82.8..."), 'oldest': 57, 'publisher__num_awards__max': 7}]
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# Aggregates can be composed over annotations.
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# The return type is derived from the composed aggregate
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>>> Book.objects.all().annotate(num_authors=Count('authors__id')).aggregate(Max('pages'), Max('price'), Sum('num_authors'), Avg('num_authors'))
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{'num_authors__sum': 10, 'num_authors__avg': 1.66..., 'pages__max': 1132, 'price__max': Decimal("82.80")}
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# Bad field requests in aggregates are caught and reported
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>>> Book.objects.all().aggregate(num_authors=Count('foo'))
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Traceback (most recent call last):
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...
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FieldError: Cannot resolve keyword 'foo' into field. Choices are: authors, contact, id, isbn, name, pages, price, pubdate, publisher, rating, store
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>>> Book.objects.all().annotate(num_authors=Count('foo'))
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Traceback (most recent call last):
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...
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FieldError: Cannot resolve keyword 'foo' into field. Choices are: authors, contact, id, isbn, name, pages, price, pubdate, publisher, rating, store
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>>> Book.objects.all().annotate(num_authors=Count('authors__id')).aggregate(Max('foo'))
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Traceback (most recent call last):
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...
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FieldError: Cannot resolve keyword 'foo' into field. Choices are: authors, contact, id, isbn, name, pages, price, pubdate, publisher, rating, store, num_authors
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# Old-style count aggregations can be mixed with new-style
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>>> Book.objects.annotate(num_authors=Count('authors')).count()
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6
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# Non-ordinal, non-computed Aggregates over annotations correctly inherit
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# the annotation's internal type if the annotation is ordinal or computed
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>>> Book.objects.annotate(num_authors=Count('authors')).aggregate(Max('num_authors'))
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{'num_authors__max': 3}
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>>> Publisher.objects.annotate(avg_price=Avg('book__price')).aggregate(Max('avg_price'))
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{'avg_price__max': 75.0...}
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# Aliases are quoted to protected aliases that might be reserved names
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>>> Book.objects.aggregate(number=Max('pages'), select=Max('pages'))
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{'number': 1132, 'select': 1132}
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# Regression for #10064: select_related() plays nice with aggregates
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>>> Book.objects.select_related('publisher').annotate(num_authors=Count('authors')).values()[0]
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{'rating': 4.0, 'isbn': u'013790395', 'name': u'Artificial Intelligence: A Modern Approach', 'pubdate': datetime.date(1995, 1, 15), 'price': Decimal("82.8..."), 'contact_id': 8, 'id': 5, 'num_authors': 2, 'publisher_id': 3, 'pages': 1132}
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# Regression for #10010: exclude on an aggregate field is correctly negated
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>>> len(Book.objects.annotate(num_authors=Count('authors')))
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6
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>>> len(Book.objects.annotate(num_authors=Count('authors')).filter(num_authors__gt=2))
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1
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>>> len(Book.objects.annotate(num_authors=Count('authors')).exclude(num_authors__gt=2))
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5
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>>> len(Book.objects.annotate(num_authors=Count('authors')).filter(num_authors__lt=3).exclude(num_authors__lt=2))
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2
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>>> len(Book.objects.annotate(num_authors=Count('authors')).exclude(num_authors__lt=2).filter(num_authors__lt=3))
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2
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# Aggregates can be used with F() expressions
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# ... where the F() is pushed into the HAVING clause
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>>> Publisher.objects.annotate(num_books=Count('book')).filter(num_books__lt=F('num_awards')/2).order_by('name').values('name','num_books','num_awards')
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[{'num_books': 1, 'name': u'Morgan Kaufmann', 'num_awards': 9}, {'num_books': 2, 'name': u'Prentice Hall', 'num_awards': 7}]
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>>> Publisher.objects.annotate(num_books=Count('book')).exclude(num_books__lt=F('num_awards')/2).order_by('name').values('name','num_books','num_awards')
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[{'num_books': 2, 'name': u'Apress', 'num_awards': 3}, {'num_books': 0, 'name': u"Jonno's House of Books", 'num_awards': 0}, {'num_books': 1, 'name': u'Sams', 'num_awards': 1}]
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# ... and where the F() references an aggregate
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>>> Publisher.objects.annotate(num_books=Count('book')).filter(num_awards__gt=2*F('num_books')).order_by('name').values('name','num_books','num_awards')
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[{'num_books': 1, 'name': u'Morgan Kaufmann', 'num_awards': 9}, {'num_books': 2, 'name': u'Prentice Hall', 'num_awards': 7}]
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>>> Publisher.objects.annotate(num_books=Count('book')).exclude(num_books__lt=F('num_awards')/2).order_by('name').values('name','num_books','num_awards')
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[{'num_books': 2, 'name': u'Apress', 'num_awards': 3}, {'num_books': 0, 'name': u"Jonno's House of Books", 'num_awards': 0}, {'num_books': 1, 'name': u'Sams', 'num_awards': 1}]
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# Regression for #10089: Check handling of empty result sets with aggregates
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>>> Book.objects.filter(id__in=[]).count()
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0
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>>> Book.objects.filter(id__in=[]).aggregate(num_authors=Count('authors'), avg_authors=Avg('authors'), max_authors=Max('authors'), max_price=Max('price'), max_rating=Max('rating'))
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{'max_authors': None, 'max_rating': None, 'num_authors': 0, 'avg_authors': None, 'max_price': None}
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>>> Publisher.objects.filter(pk=5).annotate(num_authors=Count('book__authors'), avg_authors=Avg('book__authors'), max_authors=Max('book__authors'), max_price=Max('book__price'), max_rating=Max('book__rating')).values()
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[{'max_authors': None, 'name': u"Jonno's House of Books", 'num_awards': 0, 'max_price': None, 'num_authors': 0, 'max_rating': None, 'id': 5, 'avg_authors': None}]
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# Regression for #10113 - Fields mentioned in order_by() must be included in the GROUP BY.
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# This only becomes a problem when the order_by introduces a new join.
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>>> Book.objects.annotate(num_authors=Count('authors')).order_by('publisher__name', 'name')
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[<Book: Practical Django Projects>, <Book: The Definitive Guide to Django: Web Development Done Right>, <Book: Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp>, <Book: Artificial Intelligence: A Modern Approach>, <Book: Python Web Development with Django>, <Book: Sams Teach Yourself Django in 24 Hours>]
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# Regression for #10127 - Empty select_related() works with annotate
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>>> books = Book.objects.all().filter(rating__lt=4.5).select_related().annotate(Avg('authors__age'))
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>>> sorted([(b.name, b.authors__age__avg, b.publisher.name, b.contact.name) for b in books])
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[(u'Artificial Intelligence: A Modern Approach', 51.5, u'Prentice Hall', u'Peter Norvig'), (u'Practical Django Projects', 29.0, u'Apress', u'James Bennett'), (u'Python Web Development with Django', 30.3..., u'Prentice Hall', u'Jeffrey Forcier'), (u'Sams Teach Yourself Django in 24 Hours', 45.0, u'Sams', u'Brad Dayley')]
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"""
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}
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if settings.DATABASE_ENGINE != 'sqlite3':
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__test__['API_TESTS'] += """
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# Stddev and Variance are not guaranteed to be available for SQLite.
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>>> Book.objects.aggregate(StdDev('pages'))
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{'pages__stddev': 311.46...}
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>>> Book.objects.aggregate(StdDev('rating'))
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{'rating__stddev': 0.60...}
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>>> Book.objects.aggregate(StdDev('price'))
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{'price__stddev': 24.16...}
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>>> Book.objects.aggregate(StdDev('pages', sample=True))
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{'pages__stddev': 341.19...}
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>>> Book.objects.aggregate(StdDev('rating', sample=True))
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{'rating__stddev': 0.66...}
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>>> Book.objects.aggregate(StdDev('price', sample=True))
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{'price__stddev': 26.46...}
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>>> Book.objects.aggregate(Variance('pages'))
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{'pages__variance': 97010.80...}
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>>> Book.objects.aggregate(Variance('rating'))
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{'rating__variance': 0.36...}
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>>> Book.objects.aggregate(Variance('price'))
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{'price__variance': 583.77...}
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>>> Book.objects.aggregate(Variance('pages', sample=True))
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{'pages__variance': 116412.96...}
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>>> Book.objects.aggregate(Variance('rating', sample=True))
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{'rating__variance': 0.44...}
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>>> Book.objects.aggregate(Variance('price', sample=True))
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{'price__variance': 700.53...}
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"""
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