django框架之BBS项目之文章详情和点赞

 <a href="/blog/{{ user_obj.username }}/p/{{ article.id }} "><h4 class="media-heading">{{ article.title }}</h4></a>

url(r‘^blog/(\w+)/p/(\d+)/$‘,views.article),

def article(request,username,id):
    ‘‘‘
    文章详情页面
    :param request: 请求对象
    :param username:用户名
    :param id:id
    :return:
    ‘‘‘
    user_obj = models.UserInfo.objects.filter(username=username).first()
    blog = user_obj.blog
    category_list = models.Category.objects.filter(blog=blog)
    tag_list = models.Tag.objects.filter(blog=blog)
    article_list = models.Article.objects.filter(user=user_obj)
    archive_list = models.Article.objects.filter(user=user_obj).extra(
        select={‘y_m‘: ‘DATE_FORMAT(create_time,"%%Y-%%m")‘}
    ).values(‘y_m‘).annotate(c=Count(‘id‘)).values(‘y_m‘, ‘c‘)
    article_obj = models.Article.objects.filter(id = id).first()
    print(article_obj.title)
    return render(request,‘article.html‘,{
        ‘article_obj‘:article_obj,
        ‘article_list‘: article_list,
        ‘user_obj‘: user_obj,
        ‘category_list‘: category_list,
        ‘tag_list‘: tag_list,
        ‘archive_list‘: archive_list
    })

from django import template
# 实例必须叫这个名字
register = template.Library()

from django import template
from blog import models
from django.db.models import Count

#实例必须叫这个名字
register = template.Library()

@register.inclusion_tag(filename=‘left_menu.html‘)
def left_con(username):
    print(username)
    user_obj = models.UserInfo.objects.filter(username=username).first()
    print(user_obj)
    blog = user_obj.blog
    category_list = models.Category.objects.filter(blog=blog)
    tag_list = models.Tag.objects.filter(blog=blog)
    archive_list = models.Article.objects.filter(user=user_obj).extra(
        select={‘y_m‘: ‘DATE_FORMAT(create_time,"%%Y-%%m")‘}
    ).values(‘y_m‘).annotate(c=Count(‘id‘)).values(‘y_m‘, ‘c‘)
    return {
        ‘user_obj‘:user_obj,
        ‘category_list‘: category_list,
        ‘tag_list‘: tag_list,
        ‘archive_list‘: archive_list
    }

　　{% load left_memu %}

    {% left_con user_obj.username %}

<!--点赞开始-->
    <div id="div_digg">
        <div class="diggit digg">
            <span class="diggnum" id="digg_count">{{ article_obj.up_count }}</span>
        </div>
        <div class="buryit digg">
            <span class="burynum" id="bury_count">{{ article_obj.down_count }}</span>
        </div>
        <div class="clear"></div>
        <!--提示信息-->
        <div class="diggword" id="digg_tips">

        </div>
    </div>
<!--点赞结束-->

$(‘.digg‘).click(function () {
            if(!‘{{ request.user.username }}‘){ //如果不加引号，就会被当成是变量
                //先判断有没有登陆，没有登陆就跳转到登陆页面
                location.href = ‘/login/?next={{ request.get_full_path }}‘
            }
            //已经登陆就可以点赞或反对
            var userid = ‘{{ request.user.id }}‘;
            var articleid = ‘{{ article_obj.id }}‘;
            //区分点赞还是反对
            var isup = $(this).hasClass(‘diggit‘);
            // 像后端发请求
            $.ajax({
                url:‘/up_down/‘,
                type:‘post‘,
                data:{
                    csrfmiddlewaretoken:$(‘[name="csrfmiddlewaretoken"]‘).val(),
                    userid:userid,
                    articleid:articleid,
                    isup:isup,
                },
                success:function (res) {
                    if(res.code!==0){
                        //只需要把错误提示显示出来就可以
                        $(‘.diggword‘).text(res.msg)
                    }else{
                        //1.更新点赞数或反对数
                        if(isup){
                            //点赞数加一
                            var $UpSpan = $("#digg_count");
                            $UpSpan.text(+$UpSpan.text()+1);
                            $(‘.diggword‘).text(res.msg)
                        }else{
                            // 反对数加一
                            var $downSpan = $("#bury_count");
                            $downSpan.text(+$downSpan.text()+1);
                            // 打印提示信息 
                            $(‘.diggword‘).text(res.msg)
                        }
                    }
                }
            })
        });

def up_down(request):
    if request.method == ‘POST‘:
        print(request.POST)
        res={‘code‘:0}
        userid = request.POST.get(‘userid‘)
        articleid = request.POST.get(‘articleid‘)
        isup = request.POST.get(‘isup‘)
        isup = True if isup.upper() == ‘TRUE‘ else False
        # 5. 不能给自己点赞
        is_own_article= models.Article.objects.filter(user_id=userid,id=articleid).first()
        print(is_own_article)
        if is_own_article:
            res[‘code‘] = 1
            res[‘msg‘] = ‘不能给自己点赞或反对‘
        else:
            # 3.同一个人只能给同一篇文章点赞一次
            # 4. 点赞和反对两个只能选一个
            # 判断一下 当前这个人和这篇文章在点赞表里有没有记录
            is_exit = models.ArticleUpDown.objects.filter(user_id=userid,article_id=articleid).first()
            # 如果存在
            if is_exit:
                res[‘code‘] = 1
                # 表示已经点赞过
                if is_exit.is_up == True:
                    res[‘msg‘] = ‘已经点赞过了‘
                # 表示已经反对过
                else:
                    res[‘msg‘] = ‘已经反对过了‘
            else:
                from django.db import transaction
                from django.db.models import Count, F
                  # 事务操作
                with transaction.atomic():
                    # 1.先创建点赞记录
                    models.ArticleUpDown.objects.create(user_id=userid,article_id=articleid,is_up=isup)
                    # 2.在更新文章表
                    if isup:
                        # 点赞数加1
                        models.Article.objects.filter(id=articleid).update(up_count=F(‘up_count‘)+1)
                        res[‘msg‘] = ‘点赞成功‘
                    else:
                        #反对数加1
                        models.Article.objects.filter(id=articleid).update(down_count=F(‘down_count‘)+1)
                        res[‘msg‘] = ‘反对成功‘
        return JsonResponse(res)