Question

I should be able to use the queryset ‘_contains’ on my Django object variables to filter my results, according to this documentation

But when I implement this code:

cookbooks = Books.objects.filter (category_contains = 'cooking')

I get the following error:

Cannot resolve keyword 'category_contains' into field. Choices are: category, adder, date etc.

Why is this happening? I also saw this StackOverflow question where someone explains that just using variable category implies category_exact. But if I write category_exact I get a similar error.

Answer 1

You need to use a double underscore __ not a single underscore _.