from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation

from django.contrib.contenttypes.models import ContentType

from django.db.models import Q

from django.utils.safestring import mark_safe

from django.db import models

import hashlib

#

class CourseCategory(models.Model):

    """课程大类, e.g 前端  后端..."""

    name = models.CharField(max_length=64, unique=True)

    def __str__(self):

        return "%s" % self.name

    class Meta:

        verbose_name_plural = "01.课程大类"

class CourseSubCategory(models.Model):

    """课程子类, e.g python linux """

    category = models.ForeignKey("CourseCategory", on_delete=models.CASCADE)

    name = models.CharField(max_length=64, unique=True)

    def __str__(self):

        return "%s" % self.name

    class Meta:

        verbose_name_plural = "02.课程子类"

class DegreeCourse(models.Model):

    """学位课程"""

    name = models.CharField(max_length=128, unique=True)

    course_img = models.CharField(max_length=255, verbose_name="缩略图")

    brief = models.TextField(verbose_name="学位课程简介", )

    total_scholarship = models.PositiveIntegerField(verbose_name="总奖学金(贝里)", default=40000)

    mentor_compensation_bonus = models.PositiveIntegerField(verbose_name="本课程的导师辅导费用(贝里)", default=15000)

    period = models.PositiveIntegerField(verbose_name="建议学习周期(days)", default=150)  # 为了计算学位奖学金

    prerequisite = models.TextField(verbose_name="课程先修要求", max_length=1024)

    teachers = models.ManyToManyField("Teacher", verbose_name="课程讲师")

    # 用于GenericForeignKey反向查询， 不会生成表字段，切勿删除

    # coupon = GenericRelation("Coupon")

    # 用于GenericForeignKey反向查询，不会生成表字段，切勿删除

    degreecourse_price_policy = GenericRelation("PricePolicy")

    # 查询常见问题

    asked_question = GenericRelation("OftenAskedQuestion")

    def __str__(self):

        return self.name

    class Meta:

        verbose_name_plural = "03.学位课"

#

class Teacher(models.Model):

    """讲师、导师表"""

    name = models.CharField(max_length=32)

    role_choices = ((0, '讲师'), (1, '导师'))

    role = models.SmallIntegerField(choices=role_choices, default=0)

    title = models.CharField(max_length=64, verbose_name="职位、职称")

    signature = models.CharField(max_length=255, help_text="导师签名", blank=True, null=True)

    image = models.CharField(max_length=128)

    brief = models.TextField(max_length=1024)

    def __str__(self):

        return self.name

    class Meta:

        verbose_name_plural = "04.导师或讲师"

class Scholarship(models.Model):

    """学位课程奖学金"""

    degree_course = models.ForeignKey("DegreeCourse", on_delete=models.CASCADE)

    time_percent = models.PositiveSmallIntegerField(verbose_name="奖励档位(时间百分比)", help_text="只填百分值，如80,代表80%")

    value = models.PositiveIntegerField(verbose_name="奖学金数额")

    def __str__(self):

        return "%s:%s" % (self.degree_course, self.value)

    class Meta:

        verbose_name_plural = "05.学位课奖学金"

class Course(models.Model):

    """专题课程 OR 学位课模块"""

    name = models.CharField(max_length=128, unique=True)  # Python基础

    course_img = models.CharField(max_length=255)

    sub_category = models.ForeignKey("CourseSubCategory", on_delete=models.CASCADE)  #

    course_type_choices = ((0, '付费'), (1, 'VIP专享'), (2, '学位课程'))

    course_type = models.SmallIntegerField(choices=course_type_choices)

    degree_course = models.ForeignKey("DegreeCourse", blank=True, null=True, help_text="若是学位课程，此处关联学位表",

                                      on_delete=models.CASCADE)

    brief = models.TextField(verbose_name="课程（模块）概述", max_length=2048)

    level_choices = ((0, '初级'), (1, '中级'), (2, '高级'))

    level = models.SmallIntegerField(choices=level_choices, default=1)

    pub_date = models.DateField(verbose_name="发布日期", blank=True, null=True)

    period = models.PositiveIntegerField(verbose_name="建议学习周期(days)", default=7)

    order = models.IntegerField("课程顺序", help_text="从上一个课程数字往后排")

    attachment_path = models.CharField(max_length=128, verbose_name="课件路径", blank=True, null=True)

    status_choices = ((0, '上线'), (1, '下线'), (2, '预上线'))

    status = models.SmallIntegerField(choices=status_choices, default=0)

    template_id = models.SmallIntegerField("前端模板id", default=1)

    # 如果是专题课时，获取相关优惠券

    # coupon = GenericRelation("Coupon")

    # 用于GenericForeignKey反向查询，不会生成表字段，切勿删除

    price_policy = GenericRelation("PricePolicy")

    # 查询常见问题

    asked_question = GenericRelation("OftenAskedQuestion")

    def __str__(self):

        return "%s(%s)" % (self.name, self.get_course_type_display())

    class Meta:

        verbose_name_plural = "06.专题课或学位课模块"

class CourseDetail(models.Model):

    """课程详情页内容"""

    course = models.OneToOneField("Course", on_delete=models.CASCADE)

    hours = models.IntegerField("课时")

    course_slogan = models.CharField(max_length=125, blank=True, null=True)

    video_brief_link = models.CharField(verbose_name='课程介绍', max_length=255, blank=True, null=True)

    why_study = models.TextField(verbose_name="为什么学习这门课程")

    what_to_study_brief = models.TextField(verbose_name="我将学到哪些内容")

    career_improvement = models.TextField(verbose_name="此项目如何有助于我的职业生涯")

    prerequisite = models.TextField(verbose_name="课程先修要求", max_length=1024)

    recommend_courses = models.ManyToManyField("Course", related_name="recommend_by", blank=True)

    teachers = models.ManyToManyField("Teacher", verbose_name="课程讲师")

    def __str__(self):

        return "%s" % self.course

    class Meta:

        verbose_name_plural = "07.课程或学位模块详细"

#

#

class OftenAskedQuestion(models.Model):

    """常见问题"""

    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)  # 关联course or degree_course

    object_id = models.PositiveIntegerField()

    content_object = GenericForeignKey('content_type', 'object_id')

    question = models.CharField(max_length=255)

    answer = models.TextField(max_length=1024)

    def __str__(self):

        return "%s-%s" % (self.content_object, self.question)

    class Meta:

        unique_together = ('content_type', 'object_id', 'question')

        verbose_name_plural = "08. 常见问题"

class CourseOutline(models.Model):

    """课程大纲"""

    course_detail = models.ForeignKey("CourseDetail", on_delete=models.CASCADE)

    # 前端显示顺序

    order = models.PositiveSmallIntegerField(default=1)

    title = models.CharField(max_length=128)

    content = models.TextField("内容", max_length=2048)

    def __str__(self):

        return "%s" % self.title

    class Meta:

        unique_together = ('course_detail', 'title')

        verbose_name_plural = "09. 课程大纲"

class CourseChapter(models.Model):

    """课程章节"""

    course = models.ForeignKey("Course", related_name='coursechapters', on_delete=models.CASCADE)

    chapter = models.SmallIntegerField(verbose_name="第几章", default=1)

    name = models.CharField(max_length=128)

    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:

        unique_together = ("course", 'chapter')

        verbose_name_plural = "10. 课程章节"

    def __str__(self):

        return "%s:(第%s章)%s" % (self.course, self.chapter, self.name)

class CourseSection(models.Model):

    """课时目录"""

    chapter = models.ForeignKey("CourseChapter", related_name='coursesections', on_delete=models.CASCADE)

    name = models.CharField(max_length=128)

    order = models.PositiveSmallIntegerField(verbose_name="课时排序", help_text="建议每个课时之间空1至2个值，以备后续插入课时")

    section_type_choices = ((0, '文档'), (1, '练习'), (2, '视频'))

    section_type = models.SmallIntegerField(default=2, choices=section_type_choices)

    # 59EE3275E977AADB9C33DC5901307461

    section_link = models.CharField(max_length=255, blank=True, null=True, help_text="若是video，填vid,若是文档，填link")

    video_time = 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("是否可试看", default=False)

    class Meta:

        unique_together = ('chapter', 'section_link')

        verbose_name_plural = "11. 课时"

    def __str__(self):

        return "%s-%s" % (self.chapter, self.name)

class Homework(models.Model):

    chapter = models.ForeignKey("CourseChapter", on_delete=models.CASCADE)

    title = models.CharField(max_length=128, verbose_name="作业题目")

    order = models.PositiveSmallIntegerField("作业顺序", help_text="同一课程的每个作业之前的order值间隔1-2个数")

    homework_type_choices = ((0, '作业'), (1, '模块通关考核'))

    homework_type = models.SmallIntegerField(choices=homework_type_choices, default=0)

    requirement = models.TextField(max_length=1024, verbose_name="作业需求")

    threshold = models.TextField(max_length=1024, verbose_name="踩分点")

    recommend_period = models.PositiveSmallIntegerField("推荐完成周期(天)", default=7)

    scholarship_value = models.PositiveSmallIntegerField("为该作业分配的奖学金(贝里)")

    note = models.TextField(blank=True, null=True)

    enabled = models.BooleanField(default=True, help_text="本作业如果后期不需要了，不想让学员看到，可以设置为False")

    class Meta:

        unique_together = ("chapter", "title")

        verbose_name_plural = "12. 章节作业"

    def __str__(self):

        return "%s - %s" % (self.chapter, self.title)

#

# #

# # class CourseReview(models.Model):

# #     """课程评价"""

# #     enrolled_course = models.OneToOneField("EnrolledCourse")

# #     about_teacher = models.FloatField(default=0, verbose_name="讲师讲解是否清晰")

# #     about_video = models.FloatField(default=0, verbose_name="内容实用")

# #     about_course = models.FloatField(default=0, verbose_name="课程内容通俗易懂")

# #     review = models.TextField(max_length=1024, verbose_name="评价")

# #     disagree_number = models.IntegerField(default=0, verbose_name="踩")

# #     agree_number = models.IntegerField(default=0, verbose_name="赞同数")

# #     tags = models.ManyToManyField("Tags", blank=True, verbose_name="标签")

# #     date = models.DateTimeField(auto_now_add=True, verbose_name="评价日期")

# #     is_recommend = models.BooleanField("热评推荐", default=False)

# #     hide = models.BooleanField("不在前端页面显示此条评价", default=False)

# #

# #     def __str__(self):

# #         return "%s-%s" % (self.enrolled_course.course, self.review)

# #

# #     class Meta:

# #         verbose_name_plural = "13. 课程评价（购买课程后才能评价）"

# #

# #

# # class DegreeCourseReview(models.Model):

# #     """学位课程评价

# #     为了以后可以定制单独的评价内容，所以不与普通课程的评价混在一起，单独建表

# #     """

# #     enrolled_course = models.ForeignKey("EnrolledDegreeCourse")

# #     course = models.ForeignKey("Course", verbose_name="评价学位模块", blank=True, null=True,

# #                                help_text="不填写即代表评价整个学位课程", limit_choices_to={'course_type': 2})

# #     about_teacher = models.FloatField(default=0, verbose_name="讲师讲解是否清晰")

# #     about_video = models.FloatField(default=0, verbose_name="视频质量")

# #     about_course = models.FloatField(default=0, verbose_name="课程")

# #     review = models.TextField(max_length=1024, verbose_name="评价")

# #     disagree_number = models.IntegerField(default=0, verbose_name="踩")

# #     agree_number = models.IntegerField(default=0, verbose_name="赞同数")

# #     tags = models.ManyToManyField("Tags", blank=True, verbose_name="标签")

# #     date = models.DateTimeField(auto_now_add=True, verbose_name="评价日期")

# #     is_recommend = models.BooleanField("热评推荐", default=False)

# #     hide = models.BooleanField("不在前端页面显示此条评价", default=False)

# #

# #     def __str__(self):

# #         return "%s-%s" % (self.enrolled_course, self.review)

# #

# #     class Meta:

# #         verbose_name_plural = "14. 学位课评价（购买课程后才能评价）"

# #

#

class PricePolicy(models.Model):

    """价格与有课程效期表"""

    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)  # 关联course or degree_course

    object_id = models.PositiveIntegerField()

    content_object = GenericForeignKey('content_type', 'object_id')

    # course = models.ForeignKey("Course")

    valid_period_choices = ((1, '1天'), (3, '3天'),

                            (7, '1周'), (14, '2周'),

                            (30, '1个月'),

                            (60, '2个月'),

                            (90, '3个月'),

                            (180, '6个月'), (210, '12个月'),

                            (540, '18个月'), (720, '24个月'),

                            )

    valid_period = models.SmallIntegerField(choices=valid_period_choices)

    price = models.FloatField()

    class Meta:

        unique_together = ("content_type", 'object_id', "valid_period")

        verbose_name_plural = "15. 价格策略"

    def __str__(self):

        return "%s(%s)%s" % (self.content_object, self.get_valid_period_display(), self.price)

#

# # #############深科技############################################

# class ArticleSource(models.Model):

#     """文章来源"""

#     name = models.CharField(max_length=64, unique=True)

#

#     class Meta:

#         verbose_name_plural = "16. 文章来源"

#

#     def __str__(self):

#         return self.name

#

# class Article(models.Model):

#     """文章资讯"""

#     title = models.CharField(max_length=255, unique=True, db_index=True, verbose_name="标题")

#     source = models.ForeignKey("ArticleSource", verbose_name="来源")

#     article_type_choices = ((0, '资讯'), (1, '视频'))

#     article_type = models.SmallIntegerField(choices=article_type_choices, default=0)

#     brief = models.TextField(max_length=512, verbose_name="摘要")

#     head_img = models.CharField(max_length=255)

#     content = models.TextField(verbose_name="文章正文")

#     pub_date = models.DateTimeField(verbose_name="上架日期")

#     offline_date = models.DateTimeField(verbose_name="下架日期")

#     status_choices = ((0, '在线'), (1, '下线'))

#     status = models.SmallIntegerField(choices=status_choices, default=0, verbose_name="状态")

#     order = models.SmallIntegerField(default=0, verbose_name="权重", help_text="文章想置顶，可以把数字调大，不要超过1000")

#     vid = models.CharField(max_length=128, verbose_name="视频VID", help_text="文章类型是视频, 则需要添加视频VID", blank=True, null=True)

#     comment_num = models.SmallIntegerField(default=0, verbose_name="评论数")

#     agree_num = models.SmallIntegerField(default=0, verbose_name="点赞数")

#     view_num = models.SmallIntegerField(default=0, verbose_name="观看数")

#     collect_num = models.SmallIntegerField(default=0, verbose_name="收藏数")

#

#     # tags = models.ManyToManyField("Tags", blank=True, verbose_name="标签")

#     date = models.DateTimeField(auto_now_add=True, verbose_name="创建日期")

#

#     position_choices = ((0, '信息流'), (1, 'banner大图'), (2, 'banner小图'))

#     position = models.SmallIntegerField(choices=position_choices, default=0, verbose_name="位置")

#

#

#     #comment = GenericRelation("Comment")

#

#     class Meta:

#         verbose_name_plural = "17. 文章"

#

#     def __str__(self):

#         return "%s-%s" % (self.source, self.title)

#

# class Collection(models.Model):

#     """收藏"""

#     content_type = models.ForeignKey(ContentType)

#     object_id = models.PositiveIntegerField()

#     content_object = GenericForeignKey('content_type', 'object_id')

#

#     account = models.ForeignKey("Account")

#     date = models.DateTimeField(auto_now_add=True)

#

#     class Meta:

#         unique_together = ('content_type', 'object_id', 'account')

#         verbose_name_plural = "18. 通用收藏表"

#

# class Comment(models.Model):

#     """通用的评论表"""

#     content_type = models.ForeignKey(ContentType, blank=True, null=True, verbose_name="类型")

#     object_id = models.PositiveIntegerField(blank=True, null=True)

#     content_object = GenericForeignKey('content_type', 'object_id')

#

#     p_node = models.ForeignKey("self", blank=True, null=True, verbose_name="父级评论")

#     content = models.TextField(max_length=1024)

#     account = models.ForeignKey("Account", verbose_name="会员名")

#     disagree_number = models.IntegerField(default=0, verbose_name="踩")

#     agree_number = models.IntegerField(default=0, verbose_name="赞同数")

#     date = models.DateTimeField(auto_now_add=True)

#

#     def __str__(self):

#         return self.content

#

#     class Meta:

#         verbose_name_plural = "19. 通用评论表"

class Account(models.Model):

    username = models.CharField("用户名", max_length=64, unique=True)

    password = models.CharField("密码", max_length=64)

class UserAuthToken(models.Model):

    """

    用户Token表

    """

    user = models.OneToOneField(to="Account", on_delete=models.CASCADE)

    token = models.CharField(max_length=64, unique=True)

#

# # ########################### 优惠券 ################################

# class Coupon(models.Model):

#     """优惠券生成规则"""

#     name = models.CharField(max_length=64, verbose_name="活动名称")

#     brief = models.TextField(blank=True, null=True, verbose_name="优惠券介绍")

#     coupon_type_choices = ((0, '通用券'), (1, '满减券'), (2, '折扣券'))

#     coupon_type = models.SmallIntegerField(choices=coupon_type_choices, default=0, verbose_name="券类型")

#

#     """

#     通用：

#         money_equivalent_value=100

#         off_percent=null

#         minimum_consume=0

#     满减：

#         money_equivalent_value=100

#         off_percent=null

#         minimum_consume=1000

#     折扣：

#         money_equivalent_value=0

#         off_percent=79

#         minimum_consume=0

#     """

#     money_equivalent_value = models.IntegerField(verbose_name="等值货币")

#     off_percent = models.PositiveSmallIntegerField("折扣百分比", help_text="只针对折扣券，例7.9折，写79", blank=True, null=True)

#     minimum_consume = models.PositiveIntegerField("最低消费", default=0, help_text="仅在满减券时填写此字段")

#

#     content_type = models.ForeignKey(ContentType, blank=True, null=True)

#     object_id = models.PositiveIntegerField("绑定课程", blank=True, null=True, help_text="可以把优惠券跟课程绑定")

#     content_object = GenericForeignKey('content_type', 'object_id')

#

#     quantity = models.PositiveIntegerField("数量(张)", default=1)

#     open_date = models.DateField("优惠券领取开始时间")

#     close_date = models.DateField("优惠券领取结束时间")

#     valid_begin_date = models.DateField(verbose_name="有效期开始时间", blank=True, null=True)

#     valid_end_date = models.DateField(verbose_name="有效结束时间", blank=True, null=True)

#     coupon_valid_days = models.PositiveIntegerField(verbose_name="优惠券有效期（天）", blank=True, null=True,

#                                                     help_text="自券被领时开始算起")

#     date = models.DateTimeField(auto_now_add=True)

#

#     class Meta:

#         verbose_name_plural = "31. 优惠券生成记录"

#

#     def __str__(self):

#         # 得到票的显示方式

#         return "%s(%s)" % (self.get_coupon_type_display(), self.name)

#

# # 为了保存前的时候主动报错

#     def save(self, *args, **kwargs):

#         # 如果 优惠券有效期（天） 或者 有效期开始时间 和 有效结束时间

#         if not self.coupon_valid_days or (self.valid_begin_date and self.valid_end_date):

#                     # 有效期开始时间 和 有效结束时间

#             if self.valid_begin_date and self.valid_end_date:

#                     # 有效结束时间 小于或者等于 有效期开始时间

#                 if self.valid_end_date <= self.valid_begin_date:

#                     raise ValueError("valid_end_date 有效期结束日期必须晚于 valid_begin_date ")

#

#                 # 优惠券有效期（天）

#             if self.coupon_valid_days == 0:

#                 raise ValueError("coupon_valid_days 有效期不能为0")

#

#             # 优惠券领取结束时间 小于 优惠券领取开始时间

#         if self.close_date < self.open_date:

#             raise ValueError("close_date 优惠券领取结束时间必须晚于 open_date优惠券领取开始时间 ")

#         # 重写 super 的save方法

#         super(Coupon, self).save(*args, **kwargs)

#

#

# class CouponRecord(models.Model):

#     """优惠券发放、消费纪录"""

#     coupon = models.ForeignKey("Coupon")

#     number = models.CharField(max_length=64, unique=True)

#     account = models.ForeignKey("Account", verbose_name="拥有者")

#     status_choices = ((0, '未使用'), (1, '已使用'), (2, '已过期'))

#     status = models.SmallIntegerField(choices=status_choices, default=0)

#     get_time = models.DateTimeField(verbose_name="领取时间", help_text="用户领取时间")

#     used_time = models.DateTimeField(blank=True, null=True, verbose_name="使用时间")

#     # order = models.ForeignKey("Order", blank=True, null=True, verbose_name="关联订单")  # 一个订单可以有多个优惠券

#

#     class Meta:

#         verbose_name_plural = "32. 用户优惠券"

#

#     def __str__(self):

#         return '%s-%s-%s' % (self.account, self.number, self.status)

from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelationfrom django.contrib.contenttypes.models import ContentTypefrom django.db.models import Qfrom django.utils.safestring import mark_safefrom django.db import modelsimport hashlib

#class CourseCategory(models.Model):    """课程大类, e.g 前端  后端..."""    name = models.CharField(max_length=64, unique=True)
    def __str__(self):        return "%s" % self.name
    class Meta:        verbose_name_plural = "01.课程大类"

class CourseSubCategory(models.Model):    """课程子类, e.g python linux """    category = models.ForeignKey("CourseCategory", on_delete=models.CASCADE)    name = models.CharField(max_length=64, unique=True)
    def __str__(self):        return "%s" % self.name
    class Meta:        verbose_name_plural = "02.课程子类"

class DegreeCourse(models.Model):    """学位课程"""    name = models.CharField(max_length=128, unique=True)    course_img = models.CharField(max_length=255, verbose_name="缩略图")    brief = models.TextField(verbose_name="学位课程简介", )    total_scholarship = models.PositiveIntegerField(verbose_name="总奖学金(贝里)", default=40000)    mentor_compensation_bonus = models.PositiveIntegerField(verbose_name="本课程的导师辅导费用(贝里)", default=15000)    period = models.PositiveIntegerField(verbose_name="建议学习周期(days)", default=150)  # 为了计算学位奖学金    prerequisite = models.TextField(verbose_name="课程先修要求", max_length=1024)    teachers = models.ManyToManyField("Teacher", verbose_name="课程讲师")
    # 用于GenericForeignKey反向查询， 不会生成表字段，切勿删除    # coupon = GenericRelation("Coupon")
    # 用于GenericForeignKey反向查询，不会生成表字段，切勿删除    degreecourse_price_policy = GenericRelation("PricePolicy")
    # 查询常见问题    asked_question = GenericRelation("OftenAskedQuestion")
    def __str__(self):        return self.name
    class Meta:        verbose_name_plural = "03.学位课"

#class Teacher(models.Model):    """讲师、导师表"""    name = models.CharField(max_length=32)    role_choices = ((0, '讲师'), (1, '导师'))    role = models.SmallIntegerField(choices=role_choices, default=0)    title = models.CharField(max_length=64, verbose_name="职位、职称")    signature = models.CharField(max_length=255, help_text="导师签名", blank=True, null=True)    image = models.CharField(max_length=128)    brief = models.TextField(max_length=1024)
    def __str__(self):        return self.name
    class Meta:        verbose_name_plural = "04.导师或讲师"

class Scholarship(models.Model):    """学位课程奖学金"""    degree_course = models.ForeignKey("DegreeCourse", on_delete=models.CASCADE)    time_percent = models.PositiveSmallIntegerField(verbose_name="奖励档位(时间百分比)", help_text="只填百分值，如80,代表80%")    value = models.PositiveIntegerField(verbose_name="奖学金数额")
    def __str__(self):        return "%s:%s" % (self.degree_course, self.value)
    class Meta:        verbose_name_plural = "05.学位课奖学金"

class Course(models.Model):    """专题课程 OR 学位课模块"""    name = models.CharField(max_length=128, unique=True)  # Python基础    course_img = models.CharField(max_length=255)
    sub_category = models.ForeignKey("CourseSubCategory", on_delete=models.CASCADE)  #
    course_type_choices = ((0, '付费'), (1, 'VIP专享'), (2, '学位课程'))    course_type = models.SmallIntegerField(choices=course_type_choices)
    degree_course = models.ForeignKey("DegreeCourse", blank=True, null=True, help_text="若是学位课程，此处关联学位表",                                      on_delete=models.CASCADE)
    brief = models.TextField(verbose_name="课程（模块）概述", max_length=2048)    level_choices = ((0, '初级'), (1, '中级'), (2, '高级'))    level = models.SmallIntegerField(choices=level_choices, default=1)    pub_date = models.DateField(verbose_name="发布日期", blank=True, null=True)    period = models.PositiveIntegerField(verbose_name="建议学习周期(days)", default=7)    order = models.IntegerField("课程顺序", help_text="从上一个课程数字往后排")    attachment_path = models.CharField(max_length=128, verbose_name="课件路径", blank=True, null=True)    status_choices = ((0, '上线'), (1, '下线'), (2, '预上线'))    status = models.SmallIntegerField(choices=status_choices, default=0)    template_id = models.SmallIntegerField("前端模板id", default=1)
    # 如果是专题课时，获取相关优惠券    # coupon = GenericRelation("Coupon")
    # 用于GenericForeignKey反向查询，不会生成表字段，切勿删除    price_policy = GenericRelation("PricePolicy")
    # 查询常见问题    asked_question = GenericRelation("OftenAskedQuestion")
    def __str__(self):        return "%s(%s)" % (self.name, self.get_course_type_display())
    class Meta:        verbose_name_plural = "06.专题课或学位课模块"

class CourseDetail(models.Model):    """课程详情页内容"""    course = models.OneToOneField("Course", on_delete=models.CASCADE)
    hours = models.IntegerField("课时")    course_slogan = models.CharField(max_length=125, blank=True, null=True)    video_brief_link = models.CharField(verbose_name='课程介绍', max_length=255, blank=True, null=True)    why_study = models.TextField(verbose_name="为什么学习这门课程")    what_to_study_brief = models.TextField(verbose_name="我将学到哪些内容")    career_improvement = models.TextField(verbose_name="此项目如何有助于我的职业生涯")    prerequisite = models.TextField(verbose_name="课程先修要求", max_length=1024)    recommend_courses = models.ManyToManyField("Course", related_name="recommend_by", blank=True)    teachers = models.ManyToManyField("Teacher", verbose_name="课程讲师")
    def __str__(self):        return "%s" % self.course
    class Meta:        verbose_name_plural = "07.课程或学位模块详细"

##class OftenAskedQuestion(models.Model):    """常见问题"""    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)  # 关联course or degree_course    object_id = models.PositiveIntegerField()    content_object = GenericForeignKey('content_type', 'object_id')
    question = models.CharField(max_length=255)    answer = models.TextField(max_length=1024)
    def __str__(self):        return "%s-%s" % (self.content_object, self.question)
    class Meta:        unique_together = ('content_type', 'object_id', 'question')        verbose_name_plural = "08. 常见问题"

class CourseOutline(models.Model):    """课程大纲"""    course_detail = models.ForeignKey("CourseDetail", on_delete=models.CASCADE)
    # 前端显示顺序    order = models.PositiveSmallIntegerField(default=1)
    title = models.CharField(max_length=128)    content = models.TextField("内容", max_length=2048)
    def __str__(self):        return "%s" % self.title
    class Meta:        unique_together = ('course_detail', 'title')        verbose_name_plural = "09. 课程大纲"

class CourseChapter(models.Model):    """课程章节"""    course = models.ForeignKey("Course", related_name='coursechapters', on_delete=models.CASCADE)    chapter = models.SmallIntegerField(verbose_name="第几章", default=1)    name = models.CharField(max_length=128)    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:        unique_together = ("course", 'chapter')        verbose_name_plural = "10. 课程章节"
    def __str__(self):        return "%s:(第%s章)%s" % (self.course, self.chapter, self.name)

class CourseSection(models.Model):    """课时目录"""    chapter = models.ForeignKey("CourseChapter", related_name='coursesections', on_delete=models.CASCADE)    name = models.CharField(max_length=128)    order = models.PositiveSmallIntegerField(verbose_name="课时排序", help_text="建议每个课时之间空1至2个值，以备后续插入课时")    section_type_choices = ((0, '文档'), (1, '练习'), (2, '视频'))    section_type = models.SmallIntegerField(default=2, choices=section_type_choices)    # 59EE3275E977AADB9C33DC5901307461    section_link = models.CharField(max_length=255, blank=True, null=True, help_text="若是video，填vid,若是文档，填link")
    video_time = 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("是否可试看", default=False)
    class Meta:        unique_together = ('chapter', 'section_link')        verbose_name_plural = "11. 课时"
    def __str__(self):        return "%s-%s" % (self.chapter, self.name)

class Homework(models.Model):    chapter = models.ForeignKey("CourseChapter", on_delete=models.CASCADE)    title = models.CharField(max_length=128, verbose_name="作业题目")    order = models.PositiveSmallIntegerField("作业顺序", help_text="同一课程的每个作业之前的order值间隔1-2个数")    homework_type_choices = ((0, '作业'), (1, '模块通关考核'))    homework_type = models.SmallIntegerField(choices=homework_type_choices, default=0)    requirement = models.TextField(max_length=1024, verbose_name="作业需求")    threshold = models.TextField(max_length=1024, verbose_name="踩分点")    recommend_period = models.PositiveSmallIntegerField("推荐完成周期(天)", default=7)    scholarship_value = models.PositiveSmallIntegerField("为该作业分配的奖学金(贝里)")    note = models.TextField(blank=True, null=True)    enabled = models.BooleanField(default=True, help_text="本作业如果后期不需要了，不想让学员看到，可以设置为False")
    class Meta:        unique_together = ("chapter", "title")        verbose_name_plural = "12. 章节作业"
    def __str__(self):        return "%s - %s" % (self.chapter, self.title)

## ## # class CourseReview(models.Model):# #     """课程评价"""# #     enrolled_course = models.OneToOneField("EnrolledCourse")# #     about_teacher = models.FloatField(default=0, verbose_name="讲师讲解是否清晰")# #     about_video = models.FloatField(default=0, verbose_name="内容实用")# #     about_course = models.FloatField(default=0, verbose_name="课程内容通俗易懂")# #     review = models.TextField(max_length=1024, verbose_name="评价")# #     disagree_number = models.IntegerField(default=0, verbose_name="踩")# #     agree_number = models.IntegerField(default=0, verbose_name="赞同数")# #     tags = models.ManyToManyField("Tags", blank=True, verbose_name="标签")# #     date = models.DateTimeField(auto_now_add=True, verbose_name="评价日期")# #     is_recommend = models.BooleanField("热评推荐", default=False)# #     hide = models.BooleanField("不在前端页面显示此条评价", default=False)# ## #     def __str__(self):# #         return "%s-%s" % (self.enrolled_course.course, self.review)# ## #     class Meta:# #         verbose_name_plural = "13. 课程评价（购买课程后才能评价）"# ## ## # class DegreeCourseReview(models.Model):# #     """学位课程评价# #     为了以后可以定制单独的评价内容，所以不与普通课程的评价混在一起，单独建表# #     """# #     enrolled_course = models.ForeignKey("EnrolledDegreeCourse")# #     course = models.ForeignKey("Course", verbose_name="评价学位模块", blank=True, null=True,# #                                help_text="不填写即代表评价整个学位课程", limit_choices_to={'course_type': 2})# #     about_teacher = models.FloatField(default=0, verbose_name="讲师讲解是否清晰")# #     about_video = models.FloatField(default=0, verbose_name="视频质量")# #     about_course = models.FloatField(default=0, verbose_name="课程")# #     review = models.TextField(max_length=1024, verbose_name="评价")# #     disagree_number = models.IntegerField(default=0, verbose_name="踩")# #     agree_number = models.IntegerField(default=0, verbose_name="赞同数")# #     tags = models.ManyToManyField("Tags", blank=True, verbose_name="标签")# #     date = models.DateTimeField(auto_now_add=True, verbose_name="评价日期")# #     is_recommend = models.BooleanField("热评推荐", default=False)# #     hide = models.BooleanField("不在前端页面显示此条评价", default=False)# ## #     def __str__(self):# #         return "%s-%s" % (self.enrolled_course, self.review)# ## #     class Meta:# #         verbose_name_plural = "14. 学位课评价（购买课程后才能评价）"# ##class PricePolicy(models.Model):    """价格与有课程效期表"""    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)  # 关联course or degree_course    object_id = models.PositiveIntegerField()    content_object = GenericForeignKey('content_type', 'object_id')
    # course = models.ForeignKey("Course")    valid_period_choices = ((1, '1天'), (3, '3天'),                            (7, '1周'), (14, '2周'),                            (30, '1个月'),                            (60, '2个月'),                            (90, '3个月'),                            (180, '6个月'), (210, '12个月'),                            (540, '18个月'), (720, '24个月'),                            )    valid_period = models.SmallIntegerField(choices=valid_period_choices)    price = models.FloatField()
    class Meta:        unique_together = ("content_type", 'object_id', "valid_period")        verbose_name_plural = "15. 价格策略"
    def __str__(self):        return "%s(%s)%s" % (self.content_object, self.get_valid_period_display(), self.price)

## # #############深科技############################################# class ArticleSource(models.Model):#     """文章来源"""#     name = models.CharField(max_length=64, unique=True)##     class Meta:#         verbose_name_plural = "16. 文章来源"##     def __str__(self):#         return self.name## class Article(models.Model):#     """文章资讯"""#     title = models.CharField(max_length=255, unique=True, db_index=True, verbose_name="标题")#     source = models.ForeignKey("ArticleSource", verbose_name="来源")#     article_type_choices = ((0, '资讯'), (1, '视频'))#     article_type = models.SmallIntegerField(choices=article_type_choices, default=0)#     brief = models.TextField(max_length=512, verbose_name="摘要")#     head_img = models.CharField(max_length=255)#     content = models.TextField(verbose_name="文章正文")#     pub_date = models.DateTimeField(verbose_name="上架日期")#     offline_date = models.DateTimeField(verbose_name="下架日期")#     status_choices = ((0, '在线'), (1, '下线'))#     status = models.SmallIntegerField(choices=status_choices, default=0, verbose_name="状态")#     order = models.SmallIntegerField(default=0, verbose_name="权重", help_text="文章想置顶，可以把数字调大，不要超过1000")#     vid = models.CharField(max_length=128, verbose_name="视频VID", help_text="文章类型是视频, 则需要添加视频VID", blank=True, null=True)#     comment_num = models.SmallIntegerField(default=0, verbose_name="评论数")#     agree_num = models.SmallIntegerField(default=0, verbose_name="点赞数")#     view_num = models.SmallIntegerField(default=0, verbose_name="观看数")#     collect_num = models.SmallIntegerField(default=0, verbose_name="收藏数")##     # tags = models.ManyToManyField("Tags", blank=True, verbose_name="标签")#     date = models.DateTimeField(auto_now_add=True, verbose_name="创建日期")##     position_choices = ((0, '信息流'), (1, 'banner大图'), (2, 'banner小图'))#     position = models.SmallIntegerField(choices=position_choices, default=0, verbose_name="位置")###     #comment = GenericRelation("Comment")##     class Meta:#         verbose_name_plural = "17. 文章"##     def __str__(self):#         return "%s-%s" % (self.source, self.title)## class Collection(models.Model):#     """收藏"""#     content_type = models.ForeignKey(ContentType)#     object_id = models.PositiveIntegerField()#     content_object = GenericForeignKey('content_type', 'object_id')##     account = models.ForeignKey("Account")#     date = models.DateTimeField(auto_now_add=True)##     class Meta:#         unique_together = ('content_type', 'object_id', 'account')#         verbose_name_plural = "18. 通用收藏表"## class Comment(models.Model):#     """通用的评论表"""#     content_type = models.ForeignKey(ContentType, blank=True, null=True, verbose_name="类型")#     object_id = models.PositiveIntegerField(blank=True, null=True)#     content_object = GenericForeignKey('content_type', 'object_id')##     p_node = models.ForeignKey("self", blank=True, null=True, verbose_name="父级评论")#     content = models.TextField(max_length=1024)#     account = models.ForeignKey("Account", verbose_name="会员名")#     disagree_number = models.IntegerField(default=0, verbose_name="踩")#     agree_number = models.IntegerField(default=0, verbose_name="赞同数")#     date = models.DateTimeField(auto_now_add=True)##     def __str__(self):#         return self.content##     class Meta:#         verbose_name_plural = "19. 通用评论表"
class Account(models.Model):    username = models.CharField("用户名", max_length=64, unique=True)    password = models.CharField("密码", max_length=64)

class UserAuthToken(models.Model):    """    用户Token表    """    user = models.OneToOneField(to="Account", on_delete=models.CASCADE)    token = models.CharField(max_length=64, unique=True)
## # ########################### 优惠券 ################################# class Coupon(models.Model):#     """优惠券生成规则"""#     name = models.CharField(max_length=64, verbose_name="活动名称")#     brief = models.TextField(blank=True, null=True, verbose_name="优惠券介绍")#     coupon_type_choices = ((0, '通用券'), (1, '满减券'), (2, '折扣券'))#     coupon_type = models.SmallIntegerField(choices=coupon_type_choices, default=0, verbose_name="券类型")##     """#     通用：#         money_equivalent_value=100#         off_percent=null#         minimum_consume=0#     满减：#         money_equivalent_value=100#         off_percent=null#         minimum_consume=1000#     折扣：#         money_equivalent_value=0#         off_percent=79#         minimum_consume=0#     """#     money_equivalent_value = models.IntegerField(verbose_name="等值货币")#     off_percent = models.PositiveSmallIntegerField("折扣百分比", help_text="只针对折扣券，例7.9折，写79", blank=True, null=True)#     minimum_consume = models.PositiveIntegerField("最低消费", default=0, help_text="仅在满减券时填写此字段")##     content_type = models.ForeignKey(ContentType, blank=True, null=True)#     object_id = models.PositiveIntegerField("绑定课程", blank=True, null=True, help_text="可以把优惠券跟课程绑定")#     content_object = GenericForeignKey('content_type', 'object_id')##     quantity = models.PositiveIntegerField("数量(张)", default=1)#     open_date = models.DateField("优惠券领取开始时间")#     close_date = models.DateField("优惠券领取结束时间")#     valid_begin_date = models.DateField(verbose_name="有效期开始时间", blank=True, null=True)#     valid_end_date = models.DateField(verbose_name="有效结束时间", blank=True, null=True)#     coupon_valid_days = models.PositiveIntegerField(verbose_name="优惠券有效期（天）", blank=True, null=True,#                                                     help_text="自券被领时开始算起")#     date = models.DateTimeField(auto_now_add=True)##     class Meta:#         verbose_name_plural = "31. 优惠券生成记录"##     def __str__(self):#         # 得到票的显示方式#         return "%s(%s)" % (self.get_coupon_type_display(), self.name)## # 为了保存前的时候主动报错#     def save(self, *args, **kwargs):#         # 如果 优惠券有效期（天） 或者 有效期开始时间 和 有效结束时间#         if not self.coupon_valid_days or (self.valid_begin_date and self.valid_end_date):#                     # 有效期开始时间 和 有效结束时间#             if self.valid_begin_date and self.valid_end_date:#                     # 有效结束时间 小于或者等于 有效期开始时间#                 if self.valid_end_date <= self.valid_begin_date:#                     raise ValueError("valid_end_date 有效期结束日期必须晚于 valid_begin_date ")##                 # 优惠券有效期（天）#             if self.coupon_valid_days == 0:#                 raise ValueError("coupon_valid_days 有效期不能为0")##             # 优惠券领取结束时间 小于 优惠券领取开始时间#         if self.close_date < self.open_date:#             raise ValueError("close_date 优惠券领取结束时间必须晚于 open_date优惠券领取开始时间 ")#         # 重写 super 的save方法#         super(Coupon, self).save(*args, **kwargs)### class CouponRecord(models.Model):#     """优惠券发放、消费纪录"""#     coupon = models.ForeignKey("Coupon")#     number = models.CharField(max_length=64, unique=True)#     account = models.ForeignKey("Account", verbose_name="拥有者")#     status_choices = ((0, '未使用'), (1, '已使用'), (2, '已过期'))#     status = models.SmallIntegerField(choices=status_choices, default=0)#     get_time = models.DateTimeField(verbose_name="领取时间", help_text="用户领取时间")#     used_time = models.DateTimeField(blank=True, null=True, verbose_name="使用时间")#     # order = models.ForeignKey("Order", blank=True, null=True, verbose_name="关联订单")  # 一个订单可以有多个优惠券##     class Meta:#         verbose_name_plural = "32. 用户优惠券"##     def __str__(self):#         return '%s-%s-%s' % (self.account, self.number, self.status)

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