1. 需要哪些表
      1. UserInfo
         1. username
         2. password
         3. avatar
      2. 文章表：
         title
         publish_date
         desc
         author
         詳細內容 一對一關聯 文章詳情表
      3. 文章詳情表
         info
      4. 評論表
         1. user
         2. 時間
         3. 內容
         4. 關聯的文章
         5. 是誰的子評論
 

      5. 標簽
         標簽名
         和文章 多對多
      6. 分類
         分類名
         和文章的關聯關系 多對多/一對多
      7. 點贊
         是贊還是踩
         文章
         誰點的 關聯user
2.創建ORM

from django.contrib.auth.models import AbstractUser
class UserInfo(AbstractUser):
    """
    用戶信息表
    """
    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="頭像")
    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 = "用戶"
        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)  # 個人博客標題
    site = models.CharField(max_length=32, unique=True)  # 個人博客後綴
    theme = models.CharField(max_length=32)  # 博客主題

    def __str__(self):
        return self.title

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


class Category(models.Model):
    """
    個人博客文章分類
    """
    nid = models.AutoField(primary_key=True)
    title = models.CharField(max_length=32)  # 分類標題
    blog = models.ForeignKey(to="Blog", to_field="nid")  # 外鍵關聯博客，一個博客站點可以有多個分類

    def __str__(self):
        return self.title
    ##後臺中用中文顯示##
    class Meta:
        verbose_name = "文章分類"
        verbose_name_plural = verbose_name


class Tag(models.Model):
    """
    標簽
    """
    nid = models.AutoField(primary_key=True)
    title = models.CharField(max_length=32)  # 標簽名
    blog = models.ForeignKey(to="Blog", to_field="nid")  # 所屬博客

    def __str__(self):
        return self.title

    class Meta:
        verbose_name = "標簽"
        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="文章標題")  # 文章標題
    desc = models.CharField(max_length=255)  # 文章描述
    create_time = models.DateTimeField()  # 創建時間  --> datetime()

    # 評論數
    comment_count = models.IntegerField(verbose_name="評論數", default=0)
    # 點贊數
    up_count = models.IntegerField(verbose_name="點贊數", default=0)
    # 踩
    down_count = models.IntegerField(verbose_name="踩數", 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"),  # 註意順序！！！
    )

    def __str__(self):
        return self.title

    class Meta:
        verbose_name = "文章"
        verbose_name_plural = verbose_name


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

    class Meta:
        verbose_name = "文章詳情"
        verbose_name_plural = verbose_name


class Article2Tag(models.Model):
    """
    文章和標簽的多對多關系表
    """
    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-標簽"
        verbose_name_plural = verbose_name


class ArticleUpDown(models.Model):
    """
    點贊表
    """
    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 = "文章點贊"
        verbose_name_plural = verbose_name


class Comment(models.Model):
    """
    評論表
    """
    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)  # 評論內容
    create_time = models.DateTimeField(auto_now_add=True)
    parent_comment = models.ForeignKey("self", null=True, blank=True)  # blank=True 在django admin裏面可以不填

    def __str__(self):
        return self.content

    class Meta:
        verbose_name = "評論"
        verbose_name_plural = verbose_name

1.BBS需求分析和創建ORM