如何仅从 Django 查询集中获取值？

Question

So I have a filtered QuerySet with a specific field, that looks like this:
[{'category':'book'}, {'category':'food'}, {'category':'movie'}, {'category':'book'}, {'category':'style'}, ...] .
I now want to make a list that only contains the values(book, food, movie, style), with no duplicates. How do I make it possible? Thanks. :)

Answer 1

You add .distinct() on it to retrieve the value only once. Furthermore instead of using .values('category') , you can use .values_list('category' ) to obtain a collection that only contains the categories.

So the queryset should look like:

SomeModel.objects.'category'

That being said, based on how you retrieve data, it looks like you have data duplication . You for example store the name of a category, instead of making a Category model and link to that category.