| 1 | >>> Cat.objects.annotate(nb_friends=models.Count('dog_friends'))
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| 2 | Traceback (most recent call last):
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| 3 | File "<console>", line 1, in <module>
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| 4 | File "/data/.virtualenvs/bugproxy/local/lib/python2.7/site-packages/django/db/models/manager.py", line 122, in manager_method
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| 5 | return getattr(self.get_queryset(), name)(*args, **kwargs)
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| 6 | File "/data/.virtualenvs/bugproxy/local/lib/python2.7/site-packages/django/db/models/query.py", line 908, in annotate
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| 7 | clone.query.add_annotation(annotation, alias, is_summary=False)
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| 8 | File "/data/.virtualenvs/bugproxy/local/lib/python2.7/site-packages/django/db/models/sql/query.py", line 987, in add_annotation
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| 9 | summarize=is_summary)
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| 10 | File "/data/.virtualenvs/bugproxy/local/lib/python2.7/site-packages/django/db/models/aggregates.py", line 19, in resolve_expression
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| 11 | c = super(Aggregate, self).resolve_expression(query, allow_joins, reuse, summarize)
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| 12 | File "/data/.virtualenvs/bugproxy/local/lib/python2.7/site-packages/django/db/models/expressions.py", line 509, in resolve_expression
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| 13 | c.source_expressions[pos] = arg.resolve_expression(query, allow_joins, reuse, summarize, for_save)
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| 14 | File "/data/.virtualenvs/bugproxy/local/lib/python2.7/site-packages/django/db/models/expressions.py", line 466, in resolve_expression
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| 15 | return query.resolve_ref(self.name, allow_joins, reuse, summarize)
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| 16 | File "/data/.virtualenvs/bugproxy/local/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1464, in resolve_ref
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| 17 | self.get_initial_alias(), reuse)
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| 18 | File "/data/.virtualenvs/bugproxy/local/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1405, in setup_joins
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| 19 | names, opts, allow_many, fail_on_missing=True)
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| 20 | File "/data/.virtualenvs/bugproxy/local/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1330, in names_to_path
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| 21 | "Choices are: %s" % (name, ", ".join(available)))
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| 22 | FieldError: Cannot resolve keyword 'dog_friends' into field. Choices are: id, name
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| 23 | >>> Mammal.objects.annotate(nb_friends=models.Count('dog_friends'))
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| 24 | [<Mammal: Mammal object>, <Mammal: Mammal object>]
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