[英]Querying related model-attributes in django
I have the following custom user model arrangement.我有以下自定义用户模型安排。
```
class User(AbstractUser):
is_student = models.BooleanField(default=False)
is_teacher = models.BooleanField(default=False)
class StudentProfile(models.Model):
student = models.OneToOneField(User, on_delete=models.CASCADE, primary_key=True)
location = models.CharField(max_length=8, blank=False, default='')
class TeacherProfile(models.Model):
teacher = models.OneToOneField(User, on_delete=models.CASCADE, primary_key=True)
location = models.CharField(max_length=8, blank=False, default='')
gender = models.CharField(max_length=8, choices=GENDER_CHOICES, default='')
```
I am able to a query the students based on the location of their teacher (current user).我可以根据老师(当前用户)的位置查询学生。
Student.objects.filter(location=request.user.teacher.location)
I can also query the user model & find all teachers/students我还可以查询用户模型并找到所有教师/学生
User.objects.filter(is_teacher=True)
QUESTION: Without relying on the profile models (Student & Teacher) How can I extend the query on abstractuser using profile attributes.问题:不依赖配置文件模型(学生和教师)如何使用配置文件属性扩展对抽象用户的查询。
[X]-This is wrong but the idea is something like; [X]-这是错误的,但想法是这样的;
User.objects.filter(is_teacher=True).filter(is_teacher.location=newyork)
You can follow the OneToOneField
in reverse:您可以反向遵循
OneToOneField
:
User.objects.filter(
teacherprofile__location='newyork')
You thus do not need to store is_teacher
and is_student
explicitly.因此,您不需要显式存储
is_teacher
和is_student
。 You can simply filter Student
s with:您可以简单地过滤
Student
s:
# Users with a related StudentProfile record
User.objects.filter(
studentprofile__isnull=False)
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