Question

我正在关注'{3}}部分'django by example'教程。现在，当我转到/admin/todo/datetime/并点击Add date time时，我收到此错误：

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

我的代码完全相同（除了我包含了import语句）：

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)

我看着类似的S.O.线程，但我无法弄清楚这里出了什么问题。（顺便说一下，我使用django 1.3而django 1.2用于turorial）

Answer 1

您应该将created = models.DateTimeField(auto_now_add = True)替换为created = models.ForeignKey(DateTime)模型中的Item。

Answer 2

您的模型与教程中的模型不匹配。您的Item.created为DateTimeField，Item.created为ForeignKey模型的DateTime。

# 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)

django：'运行'django by example'教程代码时出现'没有ForeignKey'错误

2 个答案: