chapter 8 课程页面-白红宇

chapter 8 课程页面

阅读量：2349 次

发布时间：2019-05-10

本文共 9141 字，大约阅读时间需要 30 分钟。

8.1 将课进行分页和筛选，文档链接 https://github.com/jamespacileo/django-pure-pagination

前端分页代码，注意第一行的

all_courses.object_list

插入课程页表

{% for course in all_courses.object_list %}    
           
                                
                
                     {
  { course.name }}
                        
     时长：{
  { course.learn_times }}0            
     学习人数：{
  { course.student }}          
    
        
                
     {
  { course.course_org.name }}            
                     {
  { course.fav_number }}                    
    
    
   
{% endfor %}

改变下标页码


   
                                        {% if all_courses.has_previous %}                                    
    上一页                                    
                                {% endif %}                                {% for page in all_courses.pages %}                                    {% if page %}                                        {% ifequal page all_courses.number %}                                            
    {
  { page }}
                                        {% else %}                                            
    {
  { page }}
                                        {% endifequal %}                                    {% else %}                                        
    ...
                                    {% endif %}                                {% endfor %}                                {% if all_courses.has_next %}                                    
    下一页
                                {% endif %}

views.py

class CourseList(View):    def get(self,request):        all_courses = Course.objects.all()        try:            page = int(request.GET.get('page', 1))#这里要做一下int转换,这里的request.GET.get('page', 1)中的page是Django在分页时自动生成的        except PageNotAnInteger:            page = 1        paginator = Paginator(all_courses,6,request=request)#每页显示条数3        courses = paginator.page(page)        return render(request,'course-list.html',{            'all_courses': courses,            # 'sort':sort        })

排序：

views.py

def get(self,request):        all_courses = Course.objects.all()        #课程排序        sort = request.GET.get('sort','')        if sort:            if sort == 'hot':                all_courses = all_courses.order_by('-click_number')            elif sort == 'students':                all_courses = all_courses.order_by('-students')        try:            page = int(request.GET.get('page', 1))#这里要做一下int转换,这里的request.GET.get('page', 1)中的page是Django在分页时自动生成的        except PageNotAnInteger:            page = 1        paginator = Paginator(all_courses,6,request=request)#每页显示条数3        courses = paginator.page(page)        return render(request,'course-list.html',{            'all_courses': courses,            'sort':sort        })

前端代码

8.2课程内容设置

后台代码

courses.views.py

class CourseDetail(View):    def get(self,request,course_id):        if request.user.is_authenticated:            username = request.user        else:            username = '未登录，请点击登陆'        course = Course.objects.get(id = course_id)        course.click_nums+=1        course.save()#记录点击课程的次数        return render(request,'course-detail.html',{            'course':course,            'username': username,        })

courses.uels.py

urlpatterns = [    #name 的作用是在前端配置路由的时候使用 url 'message:getpost'这个getpost是name = 'getpost'中的getpost    path('list/',CourseList.as_view(), name="course_list"),    re_path('detail/(?P
   
    \d)/$',CourseDetail.as_view(), name="course_detail"),]

courses.models.py

class Course(models.Model):#定义课程    course_org = models.ForeignKey(CourseOrg,verbose_name="课程机构",null=True,on_delete=models.CASCADE)    name = models.CharField(max_length=50,verbose_name=u"课程")    desc = models.CharField(max_length=300,verbose_name=u"课程描述")    detail = models.TextField(verbose_name=u"课程详情")    degree = models.CharField(choices=(("cj",u"初级"),('zj',u"中级"),('gj',u"高级")),max_length=5)#课程难度    learn_times = models.IntegerField(default=0,verbose_name=u"学习时长（分钟数）")    student = models.IntegerField(default=0,verbose_name=u"学习人数")    fav_nums= models.IntegerField(default=0,verbose_name=u"收藏人数")    image = models.ImageField(upload_to="courses/%Y/%m",verbose_name=u"封面")    click_nums = models.IntegerField(default=0,verbose_name=u"课程点击数")    add_time = models.DateTimeField(default=datetime.now,verbose_name=u"课程添加时间")    class Meta:        verbose_name = u"课程"        verbose_name_plural = verbose_name    def __str__(self):        return self.name    def get_lesson_count(self):        lesson_count = self.lesson_set.all().count()#获取到这门课程的所有章节数，前提是course是lesson的外键,不在同一文件下也可以用        return  lesson_count

部分后台代码

章 节 数：{
  { course.get_lesson_count }}

直接在前端调用course中的一个方法（get_lesson_count）

8.3 课程相对应的课程机构信息，并做收藏

courses.views.py

class CourseDetail(View):    def get(self,request,course_id):        course = Course.objects.get(id = course_id)        course.click_nums+=1        course.save()#记录点击课程的次数        course_has_fav = False        org_has_fav = False        if request.user.is_authenticated:            username = request.user            user = UserProfile.objects.get(Q(username=username) | Q(email=username))            user_id = user.id            if UserFavorate.objects.filter(user_id=user_id, fav_id=course.id, fav_type=1):#从数据库中查询                course_has_fav = True            if UserFavorate.objects.filter(user_id = user_id ,fav_id = course.course_org.id,fav_type = 2):                org_has_fav = True        else:            username = '未登录，请点击登陆'        tag = course.tag        if tag:            relate_course = Course.objects.filter(tag = tag)            relate_course = relate_course.exclude(id = course.id)[:1]#將當前課程排除在推薦課程之外        else:            relate_course = []        return render(request,'course-detail.html',{            'course':course,            'username': username,            'relate_course':relate_course,            'course_has_fav':course_has_fav,            'org_has_fav':org_has_fav        })

收藏前端代码：

js相应（course_detail）：

{% block js %}    {% endblock %}

判断是否已收藏：


   
        {% ifequal org_has_fav False %}        收藏    {% endifequal %}    {% ifequal org_has_fav True %}        已收藏    {% endifequal %}

8.4课程章节页面

8.5 忘记写了

8.6 comment 评论页面

8.7该同学还学过，其他什么课程，登陆验证，再将课程和用户进行关联：

后台，先判断是否登陆，再通过user_id拿到改用户所学过的所有课程

class CourseCommentView(View):    def get(self,request,course_id):        course = Course.objects.get(id = int(course_id))        resources = CourseResource.objects.filter(course = course)        all_comments = CourseComment.objects.filter(course = course)        # pdb.set_trace()        if request.user.is_authenticated:            username = request.user            user = UserProfile.objects.get(Q(username=username) | Q(email=username))            user_id = user.id            usercourse = UserCourse.objects.filter(user_id = user_id)[:5]        return render(request,'course-comment.html',{            'course':course,            'resources':resources,            'all_comments':all_comments,            'usercourse': usercourse        })

前端：一般操作

登陆验证：

后台：在utils文件夹下新增mixin_utils.py文件（前提是utils已经在sittings中注册过路径了）

sittings.py:

sys.path.insert(2,os.path.join(BASE_DIR,"utils"))

mixin_utils.py

from django.contrib.auth.decorators import login_requiredfrom django.utils.decorators import method_decoratorclass LoginRequiredMixin(object):    @method_decorator(login_required(login_url='/index/login/'))#调用装饰器    def dispatch(self,request,*args,**kwargs):#函数名称和参数是固定的，不可修改        return super(LoginRequiredMixin,self).dispatch(request,*args,**kwargs)

courses.views.py

class CourseInfoVideo(LoginRequiredMixin,View):#继承登陆验证函数，如果未登录则调转到登陆页面

class CourseCommentView(LoginRequiredMixin,View):

将课程和用户进行关联

后台关联代码：

class CourseInfoVideo(LoginRequiredMixin,View):#继承登陆验证函数，如果未登录则调转到登陆页面    def get(self,request,course_id):        course = Course.objects.get(id = int(course_id))        resources = CourseResource.objects.filter(course = course)        # pdb.set_trace()        if request.user.is_authenticated:#该同学还学过哪些课程            username = request.user            user = UserProfile.objects.get(Q(username=username) | Q(email=username))            user_id = user.id            usercourse = UserCourse.objects.filter(user_id = user_id)[:5]            user_course = UserCourse.objects.filter(user = username,course = course)            if not user_course:#如果当前用户的课程学习没有保存这个门课程，这将这门课程保存到，这样用户的信息下                user_course = UserCourse(user = username,course = course)                user_course.save()        return render(request,'course-video.html',{            'course':course,            'resources':resources,            'usercourse':usercourse        }) if not user_course:#如果当前用户的课程学习没有保存这个门课程，这将这门课程保存到，这样用户的信息下                user_course = UserCourse(user = username,course = course)                user_course.save()        return render(request,'course-video.html',{            'course':course,            'resources':resources,            'usercourse':usercourse        })