python3进阶开发-第一个仿博客园的项目（1）

首先我们要设计一下表结构：

UserInfo(用户信息表) --------》一对一    -----------》Blog(博客信息表)

UserInfo(用户信息表) ---------》一对多    -----------》Article UpDown(点赞表)

UserInfo(用户信息表) ---------》一对多    -----------》Article Comment(评论表)

UserInfo(用户信息表)----------》一对多    -----------》Article(文章)

Blog(博客信息表)    ----------------》 一对多   -----------》Category(个人博客文章分类表) 

Blog(博客信息表)    ----------------》一对多   ------------》Tag(标签表)

Category(个人博客文章分类表)--》 一对多 -------------》Article(文章表)

Tag(标签表)  --------------------------》多对多  -------------》Article(文章表)

Article(文章表) ------------------------》一对一  -------------》ArticleDetail(文章详情表)

Article(文章表) ------------------------》一对多  --------------》Article UpDown(点赞表)

Article(文章表) ------------------------》一对多 ---------------》Article Comment(评论表)

from django.db import models

# Create your models here.
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")

    blog = models.OneToOneField(to="Blog", to_field="nid", null=True)

    def __str__(self):
        return self.username

    class Meta:
        verbose_name = "用户信息"
        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
    theme = models.CharField(max_length=32)  # 博客主题

    def __str__(self):
        return self.title

    class Meta:
        verbose_name = "博客"
        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 "{}-{}".format(self.blog.title, self.title)

    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)  # 文章标题
    desc = models.CharField(max_length=255)  # 文章描述
    create_time = models.DateTimeField(auto_now_add=True)  # 创建时间
    category = models.ForeignKey(to="Category", to_field="nid", null=True)

    user = models.ForeignKey(to="UserInfo", to_field="nid")

    tags = models.ManyToManyField(
        to="Tag",
        through="Article2Tag",
        through_fields=("article", "tag"),
    )

    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, self.tag)

    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 = "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)

    def __str__(self):
        return self.content

    class Meta:
        verbose_name = "评论"
        verbose_name_plural = verbose_name