为什么django queryset不包含适合我的工作？(Why doesn't the django queryset contains work for me?)

为什么django queryset不包含适合我的工作？(Why doesn't the django queryset contains work for me?)

根据此文档 ，我应该可以在我的Django对象变量上使用queryset'_contains'来过滤我的结果

但是当我实现这个代码时：

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

我收到以下错误：

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

这是为什么发生？ 我还看到了这个StackOverflow问题 ，有人解释说只是使用变量category意味着category_exact 。 但是如果我编写category_exact我会得到一个类似的错误。

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.

最满意答案

您需要使用双下划线__而不是单个下划线_ 。

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