1.BBS需求分析和创建ORM

1. 需要哪些表
      1. UserInfo
         1. username
         2. password
         3. avatar
      2. 文章表：
         title
         publish_date
         desc
         author
         详细内容 一对一关联 文章详情表
      3. 文章详情表
         info
      4. 评论表
         1. user
         2. 时间
         3. 内容
         4. 关联的文章
         5. 是谁的子评论
      5. 标签
         标签名
         和文章 多对多
      6. 分类
         分类名
         和文章的关联关系 多对多/一对多
      7. 点赞
         是赞还是踩
         文章
         谁点的 关联user
2.创建ORM

from django.contrib.auth.models import AbstractUser
class UserInfo(AbstractUser):
    """
    用户信息表
    """
    nid = models.AutoField(primary_key=True)
    phone = models.CharField(max_length=11, null=True, unique=True)
    avatar = models.FileField(upload_to="avatars/", default="avatars/default.png", verbose_name="头像")
    create_time = models.DateTimeField(auto_now_add=True)
    blog = models.OneToOneField(to="Blog", to_field="nid", null=True)
    def __str__(self):
        return self.username

    class Meta:
        verbose_name = "用户"
        verbose_name_plural = verbose_name


class Blog(models.Model):
    """
    博客信息
    """
    nid = models.AutoField(primary_key=True)
    title = models.CharField(max_length=64)  # 个人博客标题
    site = models.CharField(max_length=32, unique=True)  # 个人博客后缀
    theme = models.CharField(max_length=32)  # 博客主题

    def __str__(self):
        return self.title

    class Meta:
        verbose_name = "blog站点"
        verbose_name_plural = verbose_name


class Category(models.Model):
    """
    个人博客文章分类
    """
    nid = models.AutoField(primary_key=True)
    title = models.CharField(max_length=32)  # 分类标题
    blog = models.ForeignKey(to="Blog", to_field="nid")  # 外键关联博客，一个博客站点可以有多个分类

    def __str__(self):
        return self.title
    ##后台中用中文显示##
    class Meta:
        verbose_name = "文章分类"
        verbose_name_plural = verbose_name


class Tag(models.Model):
    """
    标签
    """
    nid = models.AutoField(primary_key=True)
    title = models.CharField(max_length=32)  # 标签名
    blog = models.ForeignKey(to="Blog", to_field="nid")  # 所属博客

    def __str__(self):
        return self.title

    class Meta:
        verbose_name = "标签"
        verbose_name_plural = verbose_name


class Article(models.Model):
    """
    文章
    """
    nid = models.AutoField(primary_key=True)
    title = models.CharField(max_length=50, verbose_name="文章标题")  # 文章标题
    desc = models.CharField(max_length=255)  # 文章描述
    create_time = models.DateTimeField()  # 创建时间  --> datetime()

    # 评论数
    comment_count = models.IntegerField(verbose_name="评论数", default=0)
    # 点赞数
    up_count = models.IntegerField(verbose_name="点赞数", default=0)
    # 踩
    down_count = models.IntegerField(verbose_name="踩数", default=0)

    category = models.ForeignKey(to="Category", to_field="nid", null=True)
    user = models.ForeignKey(to="UserInfo", to_field="nid")
    tags = models.ManyToManyField(  # 中介模型
        to="Tag",
        through="Article2Tag",
        through_fields=("article", "tag"),  # 注意顺序！！！
    )

    def __str__(self):
        return self.title

    class Meta:
        verbose_name = "文章"
        verbose_name_plural = verbose_name


class ArticleDetail(models.Model):
    """
    文章详情表
    """
    nid = models.AutoField(primary_key=True)
    content = models.TextField()
    article = models.OneToOneField(to="Article", to_field="nid")

    class Meta:
        verbose_name = "文章详情"
        verbose_name_plural = verbose_name


class Article2Tag(models.Model):
    """
    文章和标签的多对多关系表
    """
    nid = models.AutoField(primary_key=True)
    article = models.ForeignKey(to="Article", to_field="nid")
    tag = models.ForeignKey(to="Tag", to_field="nid")

    def __str__(self):
        return "{}-{}".format(self.article.title, self.tag.title)

    class Meta:
        unique_together = (("article", "tag"),)
        verbose_name = "文章-标签"
        verbose_name_plural = verbose_name


class ArticleUpDown(models.Model):
    """
    点赞表
    """
    nid = models.AutoField(primary_key=True)
    user = models.ForeignKey(to="UserInfo", null=True)
    article = models.ForeignKey(to="Article", null=True)
    is_up = models.BooleanField(default=True)

    class Meta:
        unique_together = (("article", "user"),)
        verbose_name = "文章点赞"
        verbose_name_plural = verbose_name


class Comment(models.Model):
    """
    评论表
    """
    nid = models.AutoField(primary_key=True)
    article = models.ForeignKey(to="Article", to_field="nid")
    user = models.ForeignKey(to="UserInfo", to_field="nid")
    content = models.CharField(max_length=255)  # 评论内容
    create_time = models.DateTimeField(auto_now_add=True)
    parent_comment = models.ForeignKey("self", null=True, blank=True)  # blank=True 在django admin里面可以不填

    def __str__(self):
        return self.content

    class Meta:
        verbose_name = "评论"
        verbose_name_plural = verbose_name