2018-10-01-找了两个小时的bug

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layout: post
title: 找了两个小时的bug
date: 2018-10-01 21:52:00
comments: true
subtitle: A.B_set.all()！！11月1日居然发现bug自己修复了？
author: dzt
tags:

python
Django

ORM的反向查找 .all() 使用for循环无法取出数据

课程机构表：

class CourseOrg(models.Model):
    name = models.CharField(max_length=50, verbose_name='机构名称')
    desc = models.TextField(verbose_name='机构描述')
    category = models.CharField(default='pxjg', verbose_name='培训机构', max_length=20, choices=(('pxjg', '培训机构'), ('gr', '个人'), ('gx', '高校')))
    click_nums = models.IntegerField(default=0, verbose_name='点击数')
    fav_nums = models.IntegerField(default=0, verbose_name='收藏数')
    image = models.ImageField(upload_to='org/%Y/%m', verbose_name='logo', max_length=100)
    address = models.CharField(max_length=150, verbose_name='机构地址')
    city = models.ForeignKey(CityDict, verbose_name='所在城市')
    students = models.IntegerField(default=0, verbose_name='学习人数')
    courses_nums = models.IntegerField(default=0, verbose_name='课程数')
    add_time = models.DateTimeField(default=datetime.now)

课程表（外键关联课程机构）：

class Course(models.Model):
    course_org = models.ForeignKey(CourseOrg, verbose_name='课程机构', null=True, blank=True)
    name = models.CharField(max_length=50, verbose_name='课程名')
    desc = models.CharField(max_length=300, verbose_name='课程描述')
    detail = models.TextField(verbose_name='课程详情')
    degree = models.CharField(verbose_name='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(分钟数)')
    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')
    add_time = models.DateTimeField(default=datetime.now, verbose_name='添加时间')

视图函数：

class OrgHomeView(View):
    '''
    机构首页
    '''
    def get(self, request, org_id):
        course_org = CourseOrg.objects.get(id=int(org_id))
        all_courses = course_org.course_set.all()[:3]
        all_teachers = course_org.teacher_set.all()[:1]
        return render(request, 'org-detail-homepage.html', locals())

前端页面：

<div class="brief group_list">
    {% for course in all_courses %}
        <div class="module1_5 box">
            <a href="course-detail.html"><img width="214" src="{{ MEDIA_URL }}{{ course.image }}"/></a>
            <div class="des">
                <a href="course-detail.html"><h2>{{ course.name }}</h2></a>
                <span class="fl">课时：<i class="key">{{ course.learn_times }}</i></span>
                <span class="fr">参加人数：{{ course.students }}</span>
            </div>
            <div class="bottom">
                <span class="fl">{{ course.course_org.name }}</span>
                 <span class="star fr  notlogin
                    " data-favid="13"  data-fav-type="4">
                    {{ course.fav_nums }}
                </span>
            </div>
        </div>
    {% endfor %}
</div>