获取字段查询值的元组

Question

我想要一些物体的身份证。什么是让它们进入元组的干净方法？在

A.values（）queryset返回：

MyModel.objects.filter(name__startwith='A').values('id')
>>>> [{'id': 20L}, {'id': 21L}, {'id': 84L}]

我想把它们转换成一个元组，比如：

^{pr2}$

Answer 1

生成器表达式呢？在

tuple(d['id'] for d in MyModel.objects.filter(name__startwith='A').values('id'))

或者：

^{pr2}$

或者，正如出于某种原因被删除的答案所建议的那样，您可以这样做：

^{3}$

或者：

import operator
getter = operator.attrgetter('id')
tpl = tuple(map(getter, MyModel.objects.filter(name__startwith='A')))

Answer 2

最简单的解决方案是用flat=True得到{}

models.MyModel.objects.all().values_list('id', flat=True)

This is similar to values() except that instead of returning dictionaries, it returns tuples when iterated over. Each tuple contains the value from the respective field passed into the values_list() call — so the first item is the first field, etc.

If you only pass in a single field, you can also pass in the flat parameter. If True, this will mean the returned results are single values, rather than one-tuples. An example should make the difference clearer: