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python/路飞项目/6-课程模块/2-课程主页之课程表分析

2020-01-10

课程表分析

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class Course(models.Model):
name = models.CharField(max_length=64)
title = models.CharField(max_length=64)
students = models.IntegerField(default=0)
level = models.IntegerField(choices=((0, '入门'), (1, '进阶')), default=0)
time = models.IntegerField(default=0)
detail = models.TextField() # 可以关联详情表
type = models.IntegerField(choices=((0, 'Python'), (1, 'Linux')), default=0)
is_show = models.BooleanField(default=False)

class Meta:
abstract = True

# 免费课
class FreeCourse(Course):
image = models.ImageField(upload_to='course/free')
attachment = models.FileField(upload_to='attachment')

# 实战课
class ActualCourse(Course):
image = models.ImageField(upload_to='course/actual')
price = models.DecimalField(max_digits=7, decimal_places=2)
cost = models.DecimalField(max_digits=7, decimal_places=2)

# 轻课
class LightCourse(Course):
image = models.ImageField(upload_to='course/light')
price = models.DecimalField(max_digits=7, decimal_places=2)
cost = models.DecimalField(max_digits=7, decimal_places=2)
period = models.IntegerField(verbose_name='学习建议周期(month)', default=0)

# 评论表:分三个表、(id,ctx,date,user_id,free_course_id, comment_id)
# 老师表:在课程表建立多对一外键
# 章节表:在章节表建立多对一外键关联课程
# 课时表:在课时表建立多对一外键关联章节

免费课案例

创建models:course/models.py
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class CourseCategory(BaseModel):
"""分类"""
name = models.CharField(max_length=64, unique=True, verbose_name="分类名称")
class Meta:
db_table = "luffy_course_category"
verbose_name = "分类"
verbose_name_plural = verbose_name

def __str__(self):
return "%s" % self.name
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class Course(BaseModel):
"""课程"""
course_type = (
(0, '付费'),
(1, 'VIP专享'),
(2, '学位课程')
)
level_choices = (
(0, '初级'),
(1, '中级'),
(2, '高级'),
)
status_choices = (
(0, '上线'),
(1, '下线'),
(2, '预上线'),
)
name = models.CharField(max_length=128, verbose_name="课程名称")
course_img = models.ImageField(upload_to="courses", max_length=255, verbose_name="封面图片", blank=True, null=True)
course_type = models.SmallIntegerField(choices=course_type, default=0, verbose_name="付费类型")
# 使用这个字段的原因
brief = models.TextField(max_length=2048, verbose_name="详情介绍", null=True, blank=True)
level = models.SmallIntegerField(choices=level_choices, default=0, verbose_name="难度等级")
pub_date = models.DateField(verbose_name="发布日期", auto_now_add=True)
period = models.IntegerField(verbose_name="建议学习周期(day)", default=7)
attachment_path = models.FileField(upload_to="attachment", max_length=128, verbose_name="课件路径", blank=True,
null=True)
status = models.SmallIntegerField(choices=status_choices, default=0, verbose_name="课程状态")
course_category = models.ForeignKey("CourseCategory", on_delete=models.SET_NULL, db_constraint=False, null=True, blank=True,
verbose_name="课程分类")
students = models.IntegerField(verbose_name="学习人数", default=0)
sections = models.IntegerField(verbose_name="总课时数量", default=0)
pub_sections = models.IntegerField(verbose_name="课时更新数量", default=0)
price = models.DecimalField(max_digits=6, decimal_places=2, verbose_name="课程原价", default=0)
teacher = models.ForeignKey("Teacher", on_delete=models.DO_NOTHING, null=True, blank=True, verbose_name="授课老师")

class Meta:
db_table = "luffy_course"
verbose_name = "课程"
verbose_name_plural = "课程"

def __str__(self):
return "%s" % self.name
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class Teacher(BaseModel):
"""导师"""
role_choices = (
(0, '讲师'),
(1, '导师'),
(2, '班主任'),
)
name = models.CharField(max_length=32, verbose_name="导师名")
role = models.SmallIntegerField(choices=role_choices, default=0, verbose_name="导师身份")
title = models.CharField(max_length=64, verbose_name="职位、职称")
signature = models.CharField(max_length=255, verbose_name="导师签名", help_text="导师签名", blank=True, null=True)
image = models.ImageField(upload_to="teacher", null=True, verbose_name="导师封面")
brief = models.TextField(max_length=1024, verbose_name="导师描述")

class Meta:
db_table = "luffy_teacher"
verbose_name = "导师"
verbose_name_plural = verbose_name

def __str__(self):
return "%s" % self.name
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class CourseChapter(BaseModel):
"""章节"""
course = models.ForeignKey("Course", related_name='coursechapters', on_delete=models.CASCADE, verbose_name="课程名称")
chapter = models.SmallIntegerField(verbose_name="第几章", default=1)
name = models.CharField(max_length=128, verbose_name="章节标题")
summary = models.TextField(verbose_name="章节介绍", blank=True, null=True)
pub_date = models.DateField(verbose_name="发布日期", auto_now_add=True)

class Meta:
db_table = "luffy_course_chapter"
verbose_name = "章节"
verbose_name_plural = verbose_name

def __str__(self):
return "%s:(第%s章)%s" % (self.course, self.chapter, self.name)
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class CourseSection(BaseModel):
"""课时"""
section_type_choices = (
(0, '文档'),
(1, '练习'),
(2, '视频')
)
chapter = models.ForeignKey("CourseChapter", related_name='coursesections', on_delete=models.CASCADE,
verbose_name="课程章节")
name = models.CharField(max_length=128, verbose_name="课时标题")
orders = models.PositiveSmallIntegerField(verbose_name="课时排序")
section_type = models.SmallIntegerField(default=2, choices=section_type_choices, verbose_name="课时种类")
section_link = models.CharField(max_length=255, blank=True, null=True, verbose_name="课时链接",
help_text="若是video,填vid,若是文档,填link")
duration = models.CharField(verbose_name="视频时长", blank=True, null=True, max_length=32) # 仅在前端展示使用
pub_date = models.DateTimeField(verbose_name="发布时间", auto_now_add=True)
free_trail = models.BooleanField(verbose_name="是否可试看", default=False)

class Meta:
db_table = "luffy_course_Section"
verbose_name = "课时"
verbose_name_plural = verbose_name

def __str__(self):
return "%s-%s" % (self.chapter, self.name)
注册models:course/adminx.py
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import xadmin
from . import models
xadmin.site.register(models.CourseCategory)
xadmin.site.register(models.Course)
xadmin.site.register(models.Teacher)
xadmin.site.register(models.CourseChapter)
xadmin.site.register(models.CourseSection)
数据库迁移
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>: python manage.py makemigrations
>: python manage.py migrate
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