显示M2M领域通过在管理

Question

定义“到”我有以下的模型类：

class Category(models.Model): 
    category = models.CharField('category', max_length=200, blank=False) 

class Book(models.Model): 
    title = models.CharField('title', max_length=200, blank=False) 
    categories = models.ManyToManyField(Category, blank=False, through='Book_Category') 

class Book_Category(models.Model): 
    book = models.ForeignKey(Book) 
    category = models.ForeignKey(Category) 

当添加在管理界面一本新书的对象，我想也可以增加新类别，book_category关系。

如果我有类别BookAdmin作为

class BookAdmin(admin.ModelAdmin): 
    fieldsets = [ 
     (None, {'fields': ['categories', ]}), ... 

我得到can't include the ManyToManyField field 'categories' because 'categories' manually specifies a 'through' model错误。

有什么方法可以实现所需的功能吗？

Answer 1

class CategoryInline(admin.TabularInline): 
    model = Book_Category 
    extra = 3 # choose any number 

class BookAdmin(admin.ModelAdmin): 
    inlines = (CategoryInline,) 

admin.site.register(Book, BookAdmin) 

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