Django values_list vs values
The values() method returns a QuerySet containing dictionaries:
<QuerySet [{'comment_id': 1}, {'comment_id': 2}]>The values_list() method returns a QuerySet containing tuples:
<QuerySet [(1,), (2,)]>If you are using values_list() with a single field, you can use flat=True to return a QuerySet of single values instead of 1-tuples:
<QuerySet [1, 2]>
values()
Returns a QuerySet that returns dictionaries, rather than model instances, when used as an iterable.
values_list()
Returns a QuerySet that returns list of tuples, rather than model instances, when used as an iterable.
distinct()
distinct are used to eliminate the duplicate elements.
Example:
>>> list(Article.objects.values_list('id', flat=True)) # flat=True will remove the tuples and return the list [1, 2, 3, 4, 5, 6]>>> list(Article.objects.values('id'))[{'id':1}, {'id':2}, {'id':3}, {'id':4}, {'id':5}, {'id':6}]
You can get the different values with:
set(Article.objects.values_list('comment_id', flat=True))