33 课程模块——课程主页之课程表分析
一、课程表分析
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
思路
# 课程分类表
# 课程表（可能每个表字段不一样）
-所有类型课程都放到一个表中
-免费课：
-实战课：
-轻课：
-每个类型的课程设计成一个表
-Course表
# 章节表
# 课时表
# 老师表
二、免费课案例
每个应用放到一个APP里，所以创建课程app
cd luffy/apps
python ../../manage.py startapp course
记得settings.py中注册app
创建models：course/models.py
from django.db import models from utils.models import BaseModel # 分类表 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
# 课程表() 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'), ) # 课程名字 name = models.CharField(max_length=128, verbose_name="课程名称") # 课程图片 course_img = models.ImageField(upload_to="courses", max_length=255, verbose_name="封面图片", blank=True, null=True) # 课程付费类型 course_type = models.SmallIntegerField(choices=course_type, default=0, verbose_name="付费类型") # 课程介绍（bbs的文章内容） brief = models.TextField(max_length=2048, verbose_name="详情介绍", null=True, blank=True) # 课程难度等级 level = models.SmallIntegerField(choices=level_choices, default=0, verbose_name="难度等级") # 课程发布日期 pub_date = models.DateField(verbose_name="发布日期", auto_now_add=True) #建议学习周期 period = models.IntegerField(verbose_name="建议学习周期(day)", default=7) # 文档（zip，课程资料） attachment_path = models.FileField(upload_to="attachment", max_length=128, verbose_name="课件路径", blank=True, null=True) # 课程状态 status = models.SmallIntegerField(choices=status_choices, default=0, verbose_name="课程状态") # 学习人数 students = models.IntegerField(verbose_name="学习人数", default=0) #总课时数量 sections = models.IntegerField(verbose_name="总课时数量", default=0) # 课时更新数量 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) # 课程分类，跟分类表一对多，关联字段写在多的一方 # db_constraint=False:实际编码中，外键关联是人为约束，不是直接使用关联 # 不建立外键，但是orm使用跟之前一样 # blank=True 后台管理，录入的时候，blank=True可以为空 course_category = models.ForeignKey('CourseCategory', on_delete=models.SET_NULL, db_constraint=False, null=True, blank=True, verbose_name="课程分类") # 一套课程是一个老师讲，一对多 teacher = models.ForeignKey("Teacher", on_delete=models.DO_NOTHING, null=True,db_constraint=False, 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
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") # 身份 role = models.SmallIntegerField(choices=role_choices, default=0, verbose_name="导师身份") # 头衔 title = models.CharField(max_length=64, verbose_name="职位、职称") # 导师签名 signature = models.CharField(max_length=255, verbose_name="导师签名", help_text="导师签名", blank=True, null=True) # 导师图片 image = models.ImageField(upload_to="teacher", null=True, verbose_name="导师封面") # 导师描述 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
class CourseChapter(BaseModel): """章节""" # 一对多，章节多 # related_name：基于对象的跨表查询，反向操作替换掉 表名小写_set.all() # related_query_name:反向查询操作时，使用的连接前缀，用于替换表名 course = models.ForeignKey("Course", related_name='coursechapters', on_delete=models.CASCADE, verbose_name="课程名称") # 第几章 chapter = models.SmallIntegerField(verbose_name="第几章", default=1) # 章节名字 name = models.CharField(max_length=128, verbose_name="章节标题") # 介绍 summary = models.TextField(verbose_name="章节介绍", blank=True, null=True) #发布日期 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)
class CourseSection(BaseModel): """课时""" section_type_choices = ( (0, '文档'), (1, '练习'), (2, '视频') ) # 一个章节下多个课时 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
from . import models admin.site.register(models.CourseCategory) admin.site.register(models.Course) admin.site.register(models.Teacher) admin.site.register(models.CourseChapter) admin.site.register(models.CourseSection)
数据库迁移
>: python manage.py makemigrations
>: python manage.py migrate
数据录入
# 老师表 INSERT INTO luffy_teacher(id, orders, is_show, is_delete, created_time, updated_time, name, role, title, signature, image, brief) VALUES (1, 1, 1, 0, '2019-07-14 13:44:19.661327', '2019-07-14 13:46:54.246271', 'Alex', 1, '老男孩Python教学总监', '金角大王', 'teacher/alex_icon.png', '老男孩教育CTO & CO-FOUNDER 国内知名PYTHON语言推广者 51CTO学院2016\2017年度最受学员喜爱10大讲师之一 多款开源软件作者 曾任职公安部、飞信、中金公司、NOKIA中国研究院、华尔街英语、ADVENT、汽车之家等公司'); INSERT INTO luffy_teacher(id, orders, is_show, is_delete, created_time, updated_time, name, role, title, signature, image, brief) VALUES (2, 2, 1, 0, '2019-07-14 13:45:25.092902', '2019-07-14 13:45:25.092936', 'Mjj', 0, '前美团前端项目组架构师', NULL, 'teacher/mjj_icon.png', '是马JJ老师, 一个集美貌与才华于一身的男人，搞过几年IOS，又转了前端开发几年，曾就职于美团网任高级前端开发，后来因为不同意王兴(美团老板)的战略布局而出家做老师去了，有丰富的教学经验，开起车来也毫不含糊。一直专注在前端的前沿技术领域。同时，爱好抽烟、喝酒、烫头(锡纸烫)。 我的最爱是前端，因为前端妹子多。'); INSERT INTO luffy_teacher(id, orders, is_show, is_delete, created_time, updated_time, name, role, title, signature, image, brief) VALUES (3, 3, 1, 0, '2019-07-14 13:46:21.997846', '2019-07-14 13:46:21.997880', 'Lyy', 0, '老男孩Linux学科带头人', NULL, 'teacher/lyy_icon.png', 'Linux运维技术专家，老男孩Linux金牌讲师，讲课风趣幽默、深入浅出、声音洪亮到爆炸'); ### 分类表 INSERT INTO luffy_course_category(id, orders, is_show, is_delete, created_time, updated_time, name) VALUES (1, 1, 1, 0, '2019-07-14 13:40:58.690413', '2019-07-14 13:40:58.690477', 'Python'); INSERT INTO luffy_course_category(id, orders, is_show, is_delete, created_time, updated_time, name) VALUES (2, 2, 1, 0, '2019-07-14 13:41:08.249735', '2019-07-14 13:41:08.249817', 'Linux'); ### 课程表 INSERT INTO luffy_course(id, orders, is_show, is_delete, created_time, updated_time, name, course_img, course_type, brief, level, pub_date, period, attachment_path, status, students, sections, pub_sections, price, course_category_id, teacher_id) VALUES (1, 1, 1, 0, '2019-07-14 13:54:33.095201', '2019-07-14 13:54:33.095238', 'Python开发21天入门', 'courses/alex_python.png', 0, 'Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土', 0, '2019-07-14', 21, '', 0, 231, 120, 120, 0.00, 1, 1); INSERT INTO luffy_course(id, orders, is_show, is_delete, created_time, updated_time, name, course_img, course_type, brief, level, pub_date, period, attachment_path, status, students, sections, pub_sections, price, course_category_id, teacher_id) VALUES (2, 2, 1, 0, '2019-07-14 13:56:05.051103', '2019-07-14 13:56:05.051142', 'Python项目实战', 'courses/mjj_python.png', 0, '', 1, '2019-07-14', 30, '', 0, 340, 120, 120, 99.00, 1, 2); INSERT INTO luffy_course(id, orders, is_show, is_delete, created_time, updated_time, name, course_img, course_type, brief, level, pub_date, period, attachment_path, status, students, sections, pub_sections, price, course_category_id, teacher_id) VALUES (3, 3, 1, 0, '2019-07-14 13:57:21.190053', '2019-07-14 13:57:21.190095', 'Linux系统基础5周入门精讲', 'courses/lyy_linux.png', 0, '', 0, '2019-07-14', 25, '', 0, 219, 100, 100, 39.00, 2, 3); # 章节表 INSERT INTO luffy_course_chapter(id, orders, is_show, is_delete, created_time, updated_time, chapter, name, summary, pub_date, course_id) VALUES (1, 1, 1, 0, '2019-07-14 13:58:34.867005', '2019-07-14 14:00:58.276541', 1, '计算机原理', '', '2019-07-14', 1); INSERT INTO luffy_course_chapter(id, orders, is_show, is_delete, created_time, updated_time, chapter, name, summary, pub_date, course_id) VALUES (2, 2, 1, 0, '2019-07-14 13:58:48.051543', '2019-07-14 14:01:22.024206', 2, '环境搭建', '', '2019-07-14', 1); INSERT INTO luffy_course_chapter(id, orders, is_show, is_delete, created_time, updated_time, chapter, name, summary, pub_date, course_id) VALUES (3, 3, 1, 0, '2019-07-14 13:59:09.878183', '2019-07-14 14:01:40.048608', 1, '项目创建', '', '2019-07-14', 2); INSERT INTO luffy_course_chapter(id, orders, is_show, is_delete, created_time, updated_time, chapter, name, summary, pub_date, course_id) VALUES (4, 4, 1, 0, '2019-07-14 13:59:37.448626', '2019-07-14 14:01:58.709652', 1, 'Linux环境创建', '', '2019-07-14', 3); ### 课时表 INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (1, 1, 0, '2019-07-14 14:02:33.779098', '2019-07-14 14:02:33.779135', '计算机原理上', 1, 2, NULL, NULL, '2019-07-14 14:02:33.779193', 1, 1); INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (2, 1, 0, '2019-07-14 14:02:56.657134', '2019-07-14 14:02:56.657173', '计算机原理下', 2, 2, NULL, NULL, '2019-07-14 14:02:56.657227', 1, 1); INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (3, 1, 0, '2019-07-14 14:03:20.493324', '2019-07-14 14:03:52.329394', '环境搭建上', 1, 2, NULL, NULL, '2019-07-14 14:03:20.493420', 0, 2); INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (4, 1, 0, '2019-07-14 14:03:36.472742', '2019-07-14 14:03:36.472779', '环境搭建下', 2, 2, NULL, NULL, '2019-07-14 14:03:36.472831', 0, 2); INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (5, 1, 0, '2019-07-14 14:04:19.338153', '2019-07-14 14:04:19.338192', 'web项目的创建', 1, 2, NULL, NULL, '2019-07-14 14:04:19.338252', 1, 3); INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (6, 1, 0, '2019-07-14 14:04:52.895855', '2019-07-14 14:04:52.895890', 'Linux的环境搭建', 1, 2, NULL, NULL, '2019-07-14 14:04:52.895942', 1, 4);
