未定义基于 Django class 的视图查询集模型

Question

我正在 Django 制作一个网络应用程序来存储和分类课程。我遇到的问题是查询集无法识别模型。我已经设法将所有内容都拉入基于 class 的视图中并弄乱了数据，但是，当我尝试执行查询集时，它只是说模型 "Course" 未定义。我导入了以下模型：

class Course(models.Model):

    provider = models.ForeignKey(Provider)

    title = models.CharField('Course Title',
    max_length=200,
    )

    first_line = models.CharField('Address Line: 1',
    max_length=200,
    )
    second_line = models.CharField('Address Line: 2',
    max_length=200,
    )
    third_line = models.CharField('Address Line: 3',
    max_length=200,
    )
    city = models.CharField('City',
    max_length=200,
    )
    post_code = models.CharField('Post Code',
    max_length=200,
    )
    course_description = models.TextField('Description')
    date = models.DateField('Date')

    start_time = models.TimeField('Starting time')
    finish_time = models.TimeField('Finishing time')
    duration = models.IntegerField('Number of hours')
    CPD = models.IntegerField('CPD points')
    link = models.CharField('Link', max_length=200)
    category = models.ForeignKey(Categories)
    gen_cat = models.ForeignKey(Gen_Categories)
    location = models.ForeignKey(Gen_Location)
    cost = models.FloatField('Cost')

我有以下基于 class 的观点。像 date_screen() 这样的函数是在另一个文件中编写并导入的，它们在我基于函数的视图中工作。问题是它一直说 Course 未定义。如果您发现基于 class 的视图有任何其他问题，请提醒我。我可以开发一个基于 class 的视图来提取所有数据，但目前任何更多的细微差别都是令人头晕的。

class Courses_By_Location(ListView):
    template_name = 'courses/course_list.html'
    model = Course

    def get_queryset(self):
        self.Course = get_object_or_404(Course, name=self.args[0].order_by('date'))
        raw_courses = Course.objects.filter(location=self.location)
        courses = date_screen(raw_courses)
        categories = category_screen(courses)
       locations = location_screen(courses)

    def get_context_data(self, **kwargs):
        context = super(searchView, self).get_context_data(**kwargs)
    context.update({'locations': self.locations,
               'categories': self.categories,
               'courses': self.courses,
               'count': self.count,})
        return context

Answer 1

您是否从 models.py 导入了模型？

您应该通过以下方式导入模型，

from .models import Course

Answer 2

我不确定到底是什么问题，但看起来你把一些东西放在了不合适的地方。

# URLs
url(
    r'^local/(?P<location>[-\w]+)/$',
    views.Courses_By_Location.as_view(),
    name='by_location',
),

# Views
class Courses_By_Location(ListView):
    model = Course
    context_object_name = 'courses'

    def dispatch(self, request, *args, **kwargs):
        self.location = kwargs.get('location', 'DEFAULT-LOCATION')
        return super().dispatch(request, *args, **kwargs)

    def get_queryset(self):
        # `date_screen` must return a QuerySet
        return date_screen(
            # assuming the `Gen_Location` model has a `name` field
            super().get_queryset().filter(location__name__iexact=self.location),
        )

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        context['locations'] = location_screen(self.object_list)
        context['categories'] = category_screen(self.object_list)
        context['count'] = self.object_list.count()

        return context

未定义基于 Django class 的视图查询集模型

Django class based views queryset model isn't defined

django

django-models

django-views

django-class-based-views