经理不能通过`Model`实例访问 [英] Manager isn't accessible via `Model` instances
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问题描述
,但是当我想将相关对象计算到标签时
tags = TaggedItem.objects.all()
#计算标签,最小和最大计数。
min_count = max_count = tags [0] .object.objects.count()
获取:
经理不能通过Artcle实例访问
tagging.models.py
class Tag(models.Model):
name = models.CharField(max_length = 100)
slug = models.SlugField(unique = True,max_length = 100)
#.....
class TaggedItem(models.Model):
tag = models.ForeignKey(Tag)
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
object = generic .GenericForeignKey('content_type','object_id')
#.....
解决方案
错误发布在第一位,因为如果我想在这种情况下访问标签
和计数 ,我宁愿更改
tags = TaggedItem.objects.all()
#计算标签的最小值和最大值ounts。
min_count = max_count = tags [0] .object.objects.count()
:
tags = Tag.objects.all()
#计算标签,最小和最大计数。
min_count = max_count = tags [0] .taggeditem_set.count()
I have polymorphic tagging model and I want to create tag_cloud for it, but when I wanna count related object to tags
tags = TaggedItem.objects.all()
# Calculate tag, min and max counts.
min_count = max_count = tags[0].object.objects.count()
i get:
Manager isn't accessible via Artcle instances
tagging.models.py
class Tag(models.Model):
name = models.CharField(max_length=100)
slug = models.SlugField(unique=True, max_length=100)
#.....
class TaggedItem(models.Model):
tag = models.ForeignKey(Tag)
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
object = generic.GenericForeignKey('content_type', 'object_id')
#.....
解决方案
Mistake was issued in first place, Because if I want access to tags
and count them in this situation, I rather to change
tags = TaggedItem.objects.all()
# Calculate tag's min and max counts.
min_count = max_count = tags[0].object.objects.count()
to:
tags = Tag.objects.all()
# Calculate tag, min and max counts.
min_count = max_count = tags[0].taggeditem_set.count()
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