Django无法导入名称x [英] Django cannot import name x
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问题描述
我收到错误我不明白
无法导入名称项
$ b $在我的模型中,我有项目。这些项目是操作所必需的。但是其中一些项目对操作有影响:
项目
from django.db import models
from effects.models import Effect
class Type(models.Model):
name = models.CharField( max_length = 200)
def __unicode __(self):
return self.name
class Item(models.Model):
name = models。 CharField(max_length = 200)
description = models.CharField(max_length = 200)
type = models.ForeignKey(Type)
quality = models.IntegerField()
effects = models .ManyToManyField(Effect,through ='ItemEffect',blank = True)
item_requirement = models.ManyToManyField('self',through ='ItemCraft',symmetry = False,blank = True)
points = models .IntegerField()
def __unicode __(self):
return self.name
class Food(Item):
ap = models.IntegerField )
class工具(Item):
durable = models.Integ erField()
[....]
class ItemEffect(models.Model):
item = models.ForeignKey(Item)
effect = models.ForeignKey(Effect)
def __unicode __(self):
return self.item.name +':'+ str.lower(self.effect.name)
class Meta:
verbose_name_plural ='items effects'
class ItemCraft(models.Model):
item = models.ForeignKey(Item,related_name ='% )
item_requirement = models.ForeignKey(Item,related_name ='%(class)s_item_required')
number = models.IntegerField()
def __unicode __(self) :
return self.item.name +'require'+ str.lower(self.item.name)+'('+ self.number +')'
class Meta:
verbose_name_plural ='items crafts'
动作
from django.db import models
from items.models import Item
class Action(models.Model )
name = models.CharField(max_length = 200)
description = models.CharField(max_length = 200)
pa = models.IntegerField()
def __unicode __(self):
return self.name
class CraftAction(Action):
item = models.ForeignKey(Item)
def __unicode __自我):
return self.item.name +'\'craft'
class Meta:
verbose_name_plural ='crafts actions'
效果
from django.db import models
from actions.models import Action
class Effect(models.Model):
action = models.ForeignKey
class ApEffect(Effect):
ap = models.IntegerField()
解决方案
您的代码中有一个循环导入,这就是为什么无法导入项目。
您可以通过删除来解决问题进口您的其中一个文件中的类,并将其替换为包含该类名称的字符串,如文档中所述。例如:
effects = models.ManyToManyField('effects.Effect',through ='ItemEffect',blank = True)
I got an error I don't understand !
cannot import name Item
In my model, I have items. These items are required for actions. But some of these items have an effect on actions :
items
from django.db import models
from effects.models import Effect
class Type(models.Model):
name = models.CharField(max_length=200)
def __unicode__(self):
return self.name
class Item(models.Model):
name = models.CharField(max_length=200)
description = models.CharField(max_length=200)
type = models.ForeignKey(Type)
quality = models.IntegerField()
effects = models.ManyToManyField(Effect,through='ItemEffect',blank=True)
item_requirement = models.ManyToManyField('self',through='ItemCraft',symmetrical=False,blank=True)
points = models.IntegerField()
def __unicode__(self):
return self.name
class Food(Item):
ap = models.IntegerField()
class Tool(Item):
durability = models.IntegerField()
[....]
class ItemEffect(models.Model):
item = models.ForeignKey(Item)
effect = models.ForeignKey(Effect)
def __unicode__(self):
return self.item.name+':'+str.lower(self.effect.name)
class Meta:
verbose_name_plural = 'items effects'
class ItemCraft(models.Model):
item = models.ForeignKey(Item,related_name='%(class)s_item_crafted')
item_requirement = models.ForeignKey(Item,related_name='%(class)s_item_required')
number = models.IntegerField()
def __unicode__(self):
return self.item.name+' requires '+str.lower(self.item.name)+'('+self.number+')'
class Meta:
verbose_name_plural = 'items crafts'
actions
from django.db import models
from items.models import Item
class Action(models.Model):
name = models.CharField(max_length=200)
description = models.CharField(max_length=200)
pa = models.IntegerField()
def __unicode__(self):
return self.name
class CraftAction(Action):
item = models.ForeignKey(Item)
def __unicode__(self):
return self.item.name+'\'s craft'
class Meta:
verbose_name_plural = 'crafts actions'
effects
from django.db import models
from actions.models import Action
class Effect(models.Model):
action = models.ForeignKey
class ApEffect(Effect):
ap = models.IntegerField()
解决方案
There is a circular import in your code, that's why the Item can't be imported in action.
You can solve the problem by removing the import of a class in one of your files, and replacing it with a string containing the name of the class, as explained in the documentation. For example :
effects = models.ManyToManyField('effects.Effect',through='ItemEffect',blank=True)
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