python - Django 1.8 selecting distinct on lower() function throws AttributeError -


i have simple table:

class author(models.model):     name = models.charfield(max_length=40)

i want write query using django orm similar to:

select distinct lower(name) my_app_author;

i ended with:

author.objects.annotate(     name_lower=func(f('name'), function='lower') ).distinct('name_lower')

but i'm receiving error:

traceback (most recent call last):   file "/opt/venv/lib/python3.4/site-packages/django/db/models/query.py", line 138, in __repr__     data = list(self[:repr_output_size + 1])   file "/opt/venv/lib/python3.4/site-packages/django/db/models/query.py", line 162, in __iter__     self._fetch_all()   file "/opt/venv/lib/python3.4/site-packages/django/db/models/query.py", line 965, in _fetch_all     self._result_cache = list(self.iterator())   file "/opt/venv/lib/python3.4/site-packages/django/db/models/query.py", line 238, in iterator     results = compiler.execute_sql()   file "/opt/venv/lib/python3.4/site-packages/django/db/models/sql/compiler.py", line 829, in execute_sql     sql, params = self.as_sql()   file "/opt/venv/lib/python3.4/site-packages/django/db/models/sql/compiler.py", line 381, in as_sql     distinct_fields = self.get_distinct()   file "/opt/venv/lib/python3.4/site-packages/django/db/models/sql/compiler.py", line 545, in get_distinct     result.append("%s.%s" % (qn(alias), qn2(target.column))) attributeerror: 'func' object has no attribute 'column'

but when write:

author.objects.annotate(     name_lower=func(f('name'), function='lower') ).distinct('something')

i'm receiving error:

django.core.exceptions.fielderror:  cannot resolve keyword 'something' field.  choices are: id, name, name_lower, src_id

thx @knbk ,

this django bug #24986

the workaround use:

author.objects.annotate(     name_lower=func(f('name'), function='lower') ).values('name_lower').distinct()

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