[英]'Registered_Courses' object has no attribute 'course_set' Django
我真的被这个错误困住了,当我使用 course_set 时,为什么它不遵循课程外键上的 Registered_Courses 上的关系是没有意义的
视图.py
def registered_coursesView(request, username):
'''Page to display the registered courses of a user.'''
registeredCourses = Registered_Courses.objects.get(owner = request.user)
courseInfo = registeredCourses.course_set.all()
context = {'registeredCourses': registeredCourses, 'courseInfo':courseInfo}
return render(request, 'safetyCourseApp/registered_courses.html', context)
模型.py
class Course(models.Model):
'''Offered Course information.'''
subject = models.ForeignKey(Subject, on_delete=models.CASCADE)
name = models.CharField(max_length=200, primary_key=True)
description = models.TextField()
date_added = models.DateTimeField(auto_now_add=True)
start_date = models.DateField()
end_date = models.DateField()
price = models.DecimalField(max_digits=10, decimal_places=2)
capacity = models.IntegerField()
registered_ppl = models.IntegerField()
def __str__(self):
"""Return a string representation of the model."""
return self.name
class Registered_Courses(models.Model):
"""Something specific learned about a Course."""
registered_course = models.ForeignKey(Course, on_delete=models.CASCADE, null=True)
owner = models.ForeignKey(User, on_delete=models.CASCADE, null=True)
def __str__(self):
"""Return a string representation of the model."""
return f'{self.owner}'
请让我知道你们的想法。 我想不出这不起作用的原因。 谢谢!
正如您在模型中指定的那样,每个Registered_Courses
将有一个 FK to Course
,因此每个Course
可以有多个Registered_Courses
。
但是您正在尝试从单个Registered_Courses
获取多个Course
对象
落后的关系是这样的:
>>> course = Course.objects.first()
>>> course.registered_courses_set
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