BBS项目 基本表关系

from django.db import models

# Create your models here.

from django.contrib.auth.models import AbstractUser

#用户表#继承了AbstractUser，添加我们需要的字段，手机号，头像，一对一关系class UserInfo(AbstractUser):    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)

#定义__str__方法，直接输出对象名时，打印的是username的值    def __str__(self):        return self.username

class Meta:        #verbose_name 给模型起一个更可读性的名字        verbose_name = "用户信息"        #verbose_name_plural 模型的复数形式指定        verbose_name_plural = verbose_name

#博客表#创建博客标题 /创建博客主题class Blog(models.Model):    nid=models.AutoField(primary_key=True)    title=models.CharField(max_length=64) #博客标题    theme=models.CharField(max_length=32) #博客主题

def __str__(self):        return self.title

class Mede:        verbose_name="博客"        verbose_name_plural=verbose_name

#个人博客分类表#创建分类标题/外键关联博客，一个博客站点可以有多个分类#建立 与 博客一对多关系 一个博客里有多个分类class Category(models.Model):    nid=models.AutoField(primary_key=True)    title=models.CharField(max_length=64)    blog=models.ForeignKey(to="Blog",to_field="nid")

def __str__(self):        return self.title

class Mede:        verbose_name="文章分类"        verbose_name_plural=verbose_name

#标签#创造标签名/所属博客##建立与博客一对多关系 一个博客可以标记多个标签class Tag(models.Model):    nid = models.AutoField(primary_key=True)    title = models.CharField(max_length=32)    blog = models.ForeignKey(to="Blog", to_field="nid")

def __str__(self):        return self.title

class Meta:        verbose_name = "标签"        verbose_name_plural = verbose_name

#文章# 创建 文章标题/文章描述/创建时间#建立与博客分类一对多关系 一个博客分类里有多个文章#建立与用户一对多关系 一个用户可以写多个文章#建立多对多关联 文章和标签可以互相有多个class Article(models.Model):    nid = models.AutoField(primary_key=True)    title = models.CharField(max_length=50)    desc = models.CharField(max_length=255)    create_time = models.DateTimeField(auto_now_add=True)    category = models.ForeignKey(to="Category", to_field="nid", null=True)

user = models.ForeignKey(to="UserInfo")

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

#文章和标签的多对多关系表class Article2Tag(models.Model):    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

#文章详情表#创建文本类型#建立与文章一对一关联，一个文章，只有一个文本内容class ArticleDetail(models.Model):    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

#点赞表#创建布尔型是踩还是赞字段#建立与用户一对多关联，一个用户可以点赞多篇文章#建立与文章一对多关联，一个片文章可以被点多个赞class ArticleUpDown(models.Model):    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

#评论表#创建评论内容字段/评论时间字段#建立与用户一对多关联，一个用户可以评论多篇文章#建立与文章一对多关联，一个片文章可以被多个用户评论#建立与自己一对多关联，一条评论可以被多人评论class Comment(models.Model):    nid = models.AutoField(primary_key=True)    article = models.ForeignKey(to="Article", to_field="nid")    user = models.ForeignKey(to="UserInfo")    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

原文地址：https://www.cnblogs.com/yangli0504/p/9255452.html