Good afternoon,
下午好,
I'd like to make some of my page content available to sort by users themselves. I create a user-friendly form and after submitting I get the values needed for ordering.
我想让我的一些页面内容可以被用户自己排序。我创建了一个用户友好的表单，提交后我得到了排序所需的值。
For example (shoes):
例如(鞋):
ordering_string = "size,-price"
I write this string to my database so that users will no longer need to set these values again.
我将这个字符串写入我的数据库，以便用户不再需要再次设置这些值。
Now, how should I pass these arguments in a format like...
现在，我该如何以这样的格式传递这些参数呢?
shoes = ShoesModel.objects.some_kind_of_filter.order_by('size', '-price')
Yes, I can split the string by ',' and then make a tuple of values, but order_by demands *field_names (not a tuple).
是的，我可以将字符串分割为'，然后创建一个值的元组，但是order_by需要*field_names(而不是元组)。
1 个解决方案
#1
2
Python has your back here. If you want to pass all the items in a tuple to a function as arguments, you can pass the tuple into the function with an asterisk * in front of it, like this:
Python有你的支持。如果要将元组中的所有项作为参数传递给函数，可以将元组传递到函数中，并在其前面加上星号*，如下所示:
shoes = ShoesModel.objects.some_kind_of_filter.order_by(*('size', '-price'))
#1
2
Python has your back here. If you want to pass all the items in a tuple to a function as arguments, you can pass the tuple into the function with an asterisk * in front of it, like this:
Python有你的支持。如果要将元组中的所有项作为参数传递给函数，可以将元组传递到函数中，并在其前面加上星号*，如下所示:
shoes = ShoesModel.objects.some_kind_of_filter.order_by(*('size', '-price'))