Question

下面是我的Django模型代码

    from django.db import models


class BookUser(models.Model):
    email= models.CharField(max_length=254,primary_key=True)          #mail address key
    name = models.CharField(max_length=254)                  #max 64 char (lower case?)
    contact= models.CharField(max_length=12)
    imei = models.CharField(max_length=16)                #imei number
    address= models.TextField()            #list of address ids
    booksInShelf:[]        #list of user book's unique ids
    booksUnderCirculation:[]     #list of user book's unique ids


    class Meta:
        ordering = ('email',)

class Book(models.Model):
    isbn = models.CharField(max_length=13)
    title=models.CharField(max_length=500)
    description =models.TextField()
    author = models.CharField(max_length=200)
    userRating = models.CharField(max_length=1)
    users =            #list of user ids hold this book in shelf

class UserBook(models.Model):
    #id:                    generated by django
    bookId:               #id of parent book
    rent= models.BooleanField(default=False)           #boolean is ready to rent
    sell= models.BooleanField(default=False)                    #boolean is ready to sell
    price =models.FloatField()              #selling price
    rentBase=models.FloatField()          #base price of rent
    rentPeriod=models.IntegerField()             #days after which extra rent would apply
    dateModified =models.DateTimeField(auto_now=True)             #track date it came into shelf
    dateAdded = models.DateTimeField(auto_now_add=True)

这里BookUser是实际用户，有两个类别的书籍，即booksinShelf和bookUnderCirculation

class Book是所有书籍的中央存储库，我需要定义与BookUser的一对多关系。这是一种简单的方法吗？

用户手册特定于BookUser，它应该唯一地指向Class Book，因此它与Book Class的多对一关系。

我对如何处理UserBook和Book的ID感到困惑？另外如何在BookUser类中存储UserBook的ID列表？

Answer 1

这应该做你想要的：

class UserBook(models.Model):
    bookId = models.ForeignKey('Book')

此处UserBook引用了Book项，并且多个用户可以拥有相同的图书，但它仍然是您的图书集中的唯一参考。

希望有所帮助

Django模型关系

1 个答案: