Why do we need userassist if we already have prefetch?

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  I am trying to reduce my complexity by doing the following. I am trying to get all the teachers in active classrooms.

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  Teacher(models.Model):
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  classroom/models.py:
  
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      teacher = models.ForeignKey(Teacher)
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  Thanks
• Django multiple queries with foreign keys

  Let's say I have two different apps :

  teacher/models.py:
  
    Teacher(models.Model):
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       teacher = models.ForeignKey(Teacher)
       students = models.ManyToManyField(Student)
  

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     classes: ['20L','14L','30L'] #list of Class objects or ids with the above teacher
  ],
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  }
  

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  teachers = Teacher.objects.filter(id__in=classes.value_list('teacher',flat=True).distinct())
  for teacher in teachers:
      classes_for_teachers = classes.objects.filter(teacher=teacher)
  

  In the above code, there are four queries made with a loop which certainly increases the time complexity. Is there a better solution to this? Thanks in advance.
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