django：運行'django示例'時沒有ForeignKey'錯誤教程代碼

Question

我正在關注this部分'django by example'教程。現在，當我去/admin/todo/datetime/，並點擊Add date time我得到這個錯誤：

Exception Type: Exception at /admin/todo/datetime/add/ 
Exception Value: <class 'todo.models.Item'> has no ForeignKey to <class 'todo.models.DateTime'> 

我的代碼是幾乎相同的（除了我有import語句包括）：

from django.db import models 
from django.contrib import admin 

class DateTime(models.Model): 
    datetime = models.DateTimeField(auto_now_add = True) 
    def __unicode__(self): 
     return unicode(self.datetime) 

class Item(models.Model): 
    name = models.CharField(max_length = 60) 
    created = models.DateTimeField(auto_now_add = True) 
    priority = models.IntegerField(default = 0) 
    difficulty = models.IntegerField(default = 0) 
    done = models.BooleanField(default = False) 

class ItemAdmin(admin.ModelAdmin): 
    list_display = ["name", "priority", "difficulty", "created", "done"] 
    search_fields = ["name"] 

class ItemInline(admin.TabularInline): 
    model = Item 

class DateAdmin(admin.ModelAdmin): 
    list_display = ["datetime"] 
    inlines = [ItemInline] 

admin.site.register(Item, ItemAdmin) 
admin.site.register(DateTime, DateAdmin) 

我看着相似所以線程，但我不知道從那裏出了什麼問題。 （順便說一句，我用django 1.3而django 1.2在turorial使用）

Answer 1

您的模型與教程中的模型不匹配。您的Item.created是DateTimeField，而他們的Item.created是ForeignKey到DateTime型號。

# From http://lightbird.net/dbe/todo_list.html#adding-multiple-items 

class DateTime(models.Model): 
    datetime = models.DateTimeField(auto_now_add=True) 
    def __unicode__(self): 
     return unicode(self.datetime) 

class Item(models.Model): 
    name = models.CharField(max_length=60) 
    created = models.ForeignKey(DateTime) 
    priority = models.IntegerField(default=0) 
    difficulty = models.IntegerField(default=0) 
    done = models.BooleanField(default=False) 

Answer 2

你應該在你Item型號替換created = models.DateTimeField(auto_now_add = True)與created = models.ForeignKey(DateTime)。