Python django:列books\u book.publication\u date不存在

我正在读django书的第6章： 我已经做了这本书第5章和第6章告诉我的任何事情，我检查了我的工作并搜索了很多次错误，但是我仍然有问题，当我去添加一些书并保存它时，我得到了这个错误：

位于/admin/books/book的编程错误/

列books\u book.publication\u date不存在第1行： …图书“，”书名“，”图书“，”出版商“，”图书“

这是我在models.py上的模型：

from django.db import models

class Publisher(models.Model):
    name = models.CharField(max_length=30)
    address = models.CharField(max_length=50)
    city = models.CharField(max_length=60)
    state_province = models.CharField(max_length=30)
    country = models.CharField(max_length=50)
    website = models.URLField()

    def __unicode__(self):
        return self.name

    class Meta:
        ordering = ['name']
class Author(models.Model):
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=40)
    email = models.EmailField()

    def __unicode__(self):
        return u'%s %s' % (self.first_name, self.last_name)

class Book(models.Model):
    title = models.CharField(max_length=100)
    authors = models.ManyToManyField(Author)
    publisher = models.ForeignKey(Publisher)
    publication_date = models.DateField()

    def __unicode__(self):
        return self.title

这是在setting.py上：

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.messages',
    'django.contrib.sessions',
    'django.contrib.staticfiles',
    'books',
]
MIDDLEWARE_CLASSES = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
]

这在admin.py上：

from django.contrib import admin

# Register your models here.
from django.contrib import admin
from books.models import Publisher, Author, Book

admin.site.register(Publisher)
admin.site.register(Author)
admin.site.register(Book)

---

提前感谢…

您是否进行了数据库迁移？是的，我尝试了python manage.py makemigrations和python manage.py migrate和python manage.py migrate--假操作，然后我得到要执行的操作：应用所有迁移：管理、内容类型、书籍、身份验证、运行迁移的会话：不应用迁移。以下内容类型已过时，需要删除：books | auther通过外键与这些内容类型相关的任何对象也将被删除。是否确实要删除这些内容类型？如果您不确定，请回答“否”。键入“是”继续，或键入“否”取消：然后键入“否”。我也尝试键入“是”，但没有做任何正确的操作。运行python manage.py showmigrations以确保所有迁移都已应用感谢您的回答，但在尝试python manage.py runserver时只会出现一些新错误：ImportError:no module named booksbooks是您的应用程序名。你必须先完成你的项目，然后将你的应用程序命名为book。

Please correct your code like that:    

from django.contrib import admin

# Register your models here.
from django.contrib import admin
from myproject.books.models import Publisher, Author, Book

admin.site.register(Publisher)
admin.site.register(Author)
admin.site.register(Book)