如何在Django的queryset结果中创建相关字段的列表？

Question

I would like to create a queryset from another one which is obtained from a filter search query.

There are my models :

class A(models.Model):
    b   = models.ForeignKey(B)
    c   = models.ForeignKey(C)
    score   = models.FloatField(default=5) 

My first query is to filter A objects related to a particular B instance " b_instance ":

a_list  = A.objects.filter(b=b_instance)

How can I obtain form " a_list ", a " c_list " regrouping all " c " fields objects without refer to make a loop ?

Answer 1

c_list = a_list.values_list('c', flat=True)

将给出来自过滤后的A对象的所有c值的列表