django orm created in the correspondence table

django orm support in helping us create the correspondence between the table and the table. One to one, one to many and many to many.

If we want to create

• Book Table
• Press table
• On the table
• Author Details Table

Book publishers table is a table with many relationship. (Assuming that only a book published by a publishing house)

Many to many relationship between the table and the author table books.

It is one to one relationship between the author and the author details table table.

models.py
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class Book(models.Model):
    title = models.CharField(max_length=254)
    price = models.DecimalField(max_digits=8, decimal_places=2)
    # 与出版社的外键对应关系 一对多
    publish = models.ForeignKey(to='Publish')

    # 与作者的对应关系 多对多---会自动生成 关联表
    author = models.ManyToManyField(to='Author')


class Author(models.Model):
    name = models.CharField(max_length=254)
    phone = models.BigIntegerField()
    # 与作者详情表的对应关系 一对多
    author_detail = models.OneToOneField(to='AuthorDetail')


class AuthorDetail(models.Model):
    age = models.IntegerField()
    addr = models.CharField(max_length=254)


class Publish(models.Model):
    name = models.CharField(max_length=254)
    addr = models.CharField(max_length=254)