class CourseCommentView(LoginRequiredMixin, View):

    def get(self, request, course_id):

        course = Course.objects.get(id=course_id)

        return render(request, 'course-comment.html', {

            'course': course,

        })

...

from .views import  CourseCommentView

urlpatterns = [

    ...

    url(r'comment/(?P<course_id>\d+)/$', CourseCommentView.as_view(), name='course_comment'),

]

class CourseCommentView(LoginRequiredMixin, View):

    def get(self, request, course_id):

        course = Course.objects.get(id=course_id)

        all_resource = CourseResource.objects.filter(course=course)

        # 查询用户是否已经关联了该数据

        user_course = UserCourse.objects.filter(user=request.user, course=course)

        if not user_course:

            # 如果没有则写入数据库

            my_course = UserCourse(user=request.user, course=course)

            my_course.save()

        # 该同学还学过

        user_courses = UserCourse.objects.filter(course=course) #获取“用户课程”表里面该课程的所有记录

        user_ids = [user_course.user.id for user_course in user_courses] #获取学过该课程的所有用户id

        all_user_courses = UserCourse.objects.filter(user_id__in=user_ids) #获取这些用户学过的课程记录

        course_ids = [user_course.id for user_course in all_user_courses] #获取这些课程的id

        relate_courses = Course.objects.filter(id__in=course_ids).order_by('-click_nums')[:5] #根据点击量取出5个

        return render(request, 'course-comment.html', {

            'course': course,

            'all_resource': all_resource,

            'relate_courses': relate_courses,

        })

...

from operation.models import CourseComments

from django.http import HttpResponse

class AddCommentView(View):

    def post(self, request):

        if not request.user.is_authenticated():

            # 判断用户登录状态

            return HttpResponse('{"status":"fail", "msg":"用户未登录"}', content_type='application/json')

        course_id = request.POST.get('course_id', 0)

        comments = request.POST.get('comments', '')

        if int(course_id) > 0 and comments:

            course_comments = CourseComments()

            course = Course.objects.get(id=int(course_id))

            course_comments.course = course

            course_comments.comments = comments

            course_comments.user = request.user

            course_comments.save()

            return HttpResponse('{"status":"success", "msg":"添加成功"}', content_type='application/json')

        else:

            return HttpResponse('{"status":"fail", "msg":"添加失败"}', content_type='application/json')

...

from .views import AddCommentView

urlpatterns = [

    ...

    url(r'add_comment/$', AddCommentView.as_view(), name='add_comment'),

]

class Course(models.Model):

    name = models.CharField(max_length=50, verbose_name='课程名')

    course_org = models.ForeignKey(CourseOrg, verbose_name='课程机构')

    desc = models.CharField(max_length=300, verbose_name='课程描述')

    details = models.TextField(verbose_name='课程详情')

    degree = models.CharField(verbose_name='课程难度', choices=(('cj', '初级'), ('zj', '中级'), ('gj', '高级')), max_length=2)

    learn_times = models.IntegerField(default=0, verbose_name='学习时长（分钟）')

    students = models.IntegerField(default=0, verbose_name='学习人数')

    fav_nums = models.IntegerField(default=0, verbose_name='收藏人数')

    image = models.ImageField(upload_to='courses/%Y/%m', verbose_name='封面图', max_length=100)

    click_nums = models.IntegerField(default=0, verbose_name='点击数')

    category = models.CharField(max_length=10, verbose_name=u'类别', default='')

    tag = models.CharField(max_length=10, verbose_name=u'标签', default='')

    teacher = models.ForeignKey(Teacher, verbose_name='课程讲师', null=True, blank=True)

    youneed_know = models.CharField(default='', max_length=300, verbose_name='课程须知')

    teacher_tell = models.CharField(default='', max_length=300, verbose_name='你能学到')

    add_time = models.DateTimeField(default=datetime.now, verbose_name='添加时间')

    class Meta:

        verbose_name = '课程'

        verbose_name_plural = verbose_name

    def get_lesson_nums(self):

        """获取章节数"""

        return self.lesson_set.count()

    def get_lesson(self):

        """获取章节"""

        return self.lesson_set.all()

    def get_students(self):

        """获取3个学习用户"""

        return self.usercourse_set.all()[:3]

    def get_comment(self):

        """获取评论"""

        return self.coursecomments_set.all()

    def __str__(self):

        return self.name