【Django在线教育平台】11.机构收藏功能实现

专题：Django2.0.8+xadmin2实现在线学习网站

Django2.0.8+xadmin2实现在线学习网站，课程、讲师、机构、用户收藏功能。GitHub地址：https://github.com/xyliurui/OnlineLearningPlatform ；Django版本：2.0.8

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机构收藏功能

机构模型增加收藏数更新函数

# 课程机构信息
class CourseOrg(models.Model):
    ORG_CHOICES = (
        ("pxjg", "培训机构"),
        ("gx", "高校"),
        ("gr", "个人"),
    )

    name = models.CharField(max_length=50, verbose_name='机构名称')
    desc = models.TextField(verbose_name='机构描述')
    category = models.CharField(choices=ORG_CHOICES, max_length=10, default='pxjg', verbose_name='机构类别')
    click_nums = models.IntegerField(default=0, verbose_name='点击数')
    fav_nums = models.IntegerField(default=0, verbose_name='收藏数')
    students = models.IntegerField(default=0, verbose_name='学习人数')
    course_nums = models.IntegerField(default=0, verbose_name='课程数')
    image = models.ImageField(upload_to='org/%Y/%m', max_length=100, blank=True, null=True, verbose_name='封面图')
    address = models.CharField(max_length=150, verbose_name='机构地址')
    city = models.ForeignKey(CityDict, on_delete=models.CASCADE, verbose_name='所在城市')
    add_time = models.DateTimeField(default=datetime.now, verbose_name='添加时间')

    class Meta:
        verbose_name_plural = verbose_name = '课程机构'

    def change_fav_nums(self, add=1):
        self.fav_nums += add
        self.save(update_fields=['fav_nums'])

    def __str__(self):
        return self.name

用于收藏和取消收藏时值加减

机构收藏ajax视图AddFavView(View)

# 机构收藏或取消收藏
class AddFavView(View):
    def post(self, request):
        # 收藏的不管是课程，讲师，还是机构，都是记录他们的id，如果没取到把它设置未0，避免查询时异常
        fav_id = request.POST.get('fav_id', 0)
        # 表明收藏的类别
        fav_type = request.POST.get('fav_type', 0)

        # 收藏与已收藏取消收藏
        # 判断用户是否登录:即使没登录会有一个匿名的user
        if not request.user.is_authenticated:
            # 未登录时返回json提示未登录，跳转到登录页面是在ajax中做的
            return HttpResponse('{"fav_status":"fail", "fav_msg":"用户未登录"}', content_type='application/json')

        exist_records = UserFavorite.objects.filter(user=request.user, fav_id=fav_id, fav_type=fav_type)

        if exist_records:
            # 如果已经存在，表明用户取消收藏
            exist_records.delete()
            # 机构模型中存储的收藏数减1
            CourseOrg.objects.get(id=fav_id).change_fav_nums(add=-1)
            return HttpResponse('{"fav_status":"success", "fav_msg":"添加收藏"}', content_type='application/json')
        else:
            user_fav = UserFavorite()
            # 如果取到了id值才进行收藏
            if int(fav_id) > 0 and int(fav_type) > 0:
                user_fav.fav_id = fav_id
                user_fav.fav_type = fav_type
                user_fav.user = request.user
                user_fav.save()
                # 机构模型中存储的收藏数加1
                CourseOrg.objects.get(id=fav_id).change_fav_nums(add=1)
                return HttpResponse('{"fav_status":"success", "fav_msg":"取消收藏"}', content_type='application/json')
            else:
                return HttpResponse('{"fav_status":"fail", "fav_msg":"收藏出错"}', content_type='application/json')

收藏功能url

from organization.views import OrgListView, AddUserAskView, OrgHomeView, OrgCourseView, OrgDescView, OrgTeacherView, AddFavView

app_name = 'organization'

urlpatterns = [
    # 课程机构列表url
    path('list/', OrgListView.as_view(), name="org_list"),
    path('add_ask/', AddUserAskView.as_view(), name='add_ask'),
    re_path('home/(?P<org_id>\d+)/', OrgHomeView.as_view(), name='org_home'),  # 机构详情首页
    re_path('id/(?P<org_id>\d+)/courses/', OrgCourseView.as_view(), name='org_course'),  # 机构课程列表
    re_path('id/(?P<org_id>\d+)/desc/', OrgDescView.as_view(), name='org_desc'),  # 机构介绍
    re_path('id/(?P<org_id>\d+)/teacher/', OrgTeacherView.as_view(), name='org_teacher'),  # 机构讲师
    path('add_fav/', AddFavView.as_view(), name="add_fav"),  # 添加机构收藏
]

机构收藏模板按钮

监听按钮点击动作，post提交，改变按钮的样式和文字

<p>
    {% if has_fav %}
        <button id="add_fav_org_button" class="btn-round btn-light" style="background: #FFA042">取消收藏</button>
    {% else %}
        <button id="add_fav_org_button" class="btn-round btn-light" style="background: #02DF82">添加收藏</button>
    {% endif %}
</p>


<script type="text/javascript">

//添加或取消收藏
function add_fav_org(current_elem, fav_id, fav_type){
    $.ajax({
        cache: false,
        type: "POST",
        url:"{% url 'org:add_fav' %}",
        data:{'fav_id':fav_id, 'fav_type':fav_type},
        async: true,
        beforeSend:function(xhr, settings){
            xhr.setRequestHeader("X-CSRFToken", "{{ csrf_token }}");
        },
        success: function(data) {
            if(data.fav_status === 'fail'){
                if(data.fav_msg === '用户未登录'){
                    window.location.href="/login/?next={{ request.path }}";
                }else{
                    alert(data.fav_msg)
                }

            }else if(data.fav_status === 'success'){
                current_elem.text(data.fav_msg);
                // 修改按钮的颜色
                if (data.fav_msg === '取消收藏') {
                    document.getElementById('add_fav_org_button').style.background = '#FFA042';
                } else if (data.fav_msg === '添加收藏') {
                    document.getElementById('add_fav_org_button').style.background = '#02DF82';
                }
            }
        },
    });
}

$('#add_fav_org_button').on('click', function(){
    add_fav_org($(this), {{ course_org.id }}, 2);
});

</script>

BLOG_20190604_140507_46

机构信息页面视图添加收藏状态

例如机构首页，添加has_fav来检测是否已收藏，且需要用户登录的，同事还需要将课程页面、讲师页面、介绍页面都添加上

        has_fav = False
        if request.user.is_authenticated:
            if UserFavorite.objects.filter(user=request.user, fav_id=course_org.id, fav_type=2):
                has_fav = True

例如

# 机构首页
class OrgHomeView(View):
    def get(self, request, org_id):
        # 通过id找到机构
        course_org = CourseOrg.objects.get(id=org_id)

        # 通过机构找到这个机构的课程和教师，并按一些数据进行排序
        all_course = course_org.courses.all().order_by('-students', '-fav_nums', 'click_nums')[:4]
        all_teacher = course_org.teachers.all().order_by('-fav_nums', '-click_nums')[:4]

        # TYPE_CHOICES = (
        #     (1, "课程"),
        #     (2, "课程机构"),
        #     (3, "讲师")
        # )
        has_fav = False
        if request.user.is_authenticated:
            if UserFavorite.objects.filter(user=request.user, fav_id=course_org.id, fav_type=2):
                has_fav = True

        return render(request, 'org-detail-homepage.html', locals())

标记访问页面

可以在org中每个视图添加一个参数，用于选中激活

        # 标记当前页，用于页面选中active
        current_access_url = 'org'

然后前端判断

<li {% ifequal current_access_url 'org' %} class="active" {% endifequal %}><a href="{% url 'org:org_list' %}">授课机构</a></li>