实验楼表关系建立 (课程模块·5张表）

实验楼表关系图

from utils.MyBaseModel import Base
from django.db import models
#

# Create your models here.
# 课程类别
class CourseType(Base):
    title = models.CharField('课程类别', max_length=32)
    sequence = models.IntegerField('顺序显示', default=10)

    class Meta:
        db_table = 'tb_coursetype'

    def __str__(self):
        return self.title

#
#课程标签
class CourseTag(Base):
    title = models.CharField('课程标签', max_length=32)
    sequence = models.IntegerField('展示顺序', default=10)

    class Meta:
        db_table = 'tb_coursetag'

    def __str__(self):
        return self.title

# 课程表
class Course(Base):
    STATUS = (
        ('0', '即将上线'),
        ('1', '已上线'),
        ('2', '已下线'),
    )
    title = models.CharField('课程名', max_length=24)
    desc = models.CharField('课程名', max_length=256)
    img = models.ImageField('课程logo', upload_to='course', null=True)
    course_type = models.ForeignKey(CourseType, verbose_name='课程类别', on_delete=models.CASCADE, default=None, null=True)
    course_tag = models.ManyToManyField(CourseTag, verbose_name='课程标签')
    status = models.CharField('课程状态', choices=STATUS, max_length=8, default='1')
    attention = models.IntegerField('关注人数', default=0)
    learner = models.IntegerField('学习人数', default=0)

    class Meta:
        db_table = 'tb_course'

    def __str__(self):
        return self.title

# zhang
class Chapters(Base):
    title = models.CharField('章标题', max_length=24)
    serial_num=models.IntegerField('章序号')
    course=models.ForeignKey(Course,related_name='chapters',on_delete=models.SET_NULL,null=True)

    class Meta:
        db_table = 'tb_chapters'

    def __str__(self):
        return self.title
# 节表
class Sections(Base):
    title = models.CharField('节标题', max_length=32)
    serial_num=models.IntegerField('节序号')
    chapters=models.ForeignKey(Chapters,related_name='sections',on_delete=models.SET_NULL,null=True)
    learn_time=models.IntegerField('学习小时',default=1)
    video=models.FileField('上传视频',upload_to='videos/%Y%m%d/',blank=True,max_length=1024)
    seq_num = models.IntegerField('序号', default=1)

    class Meta:
        db_table = 'tb_sections'
    def __str__(self):
        return self.title