[英]Django-mptt order
In my project I am using django-mptt for categories. 在我的项目中,我使用django-mptt进行分类。
My model: 我的模特:
class Category(models.model):
name = models.CharField()
parent = models.ForeignKey("self", blank=True, null=True,
related_name="sub_category")
nav_order = models.IntegerField(null=False, blank=False, default=0)
# unsure need nav_order column in DB
class Meta:
verbose_name_plural = 'Categories'
mptt.register(Category)
And I need to have ability get order for current category like this: 我需要有能力获得当前类别的订单,如下所示:
Category Navigation order(one column)
CatA 0
|-subcat11 0
|-sub11a 0
|-sub11b 1
\-sub11c 2
\-subcat12 1
CatB 1
|-subcat21 0
|-subcat22 1
\-subcat23 2
\-sub23a 0
CatC 2
How can I quickly fill/recalculate order column on creating/moving elements. 如何在创建/移动元素上快速填充/重新计算订单列。 Or calculate it by Category's method Category.objects.get(name='sub11b').get_order()
should return 1. 或者通过Category的方法Category.objects.get(name='sub11b').get_order()
计算它Category.objects.get(name='sub11b').get_order()
应该返回1。
When defining the model you can specify the ordering with "order_insertion_by". 定义模型时,可以使用“order_insertion_by”指定顺序。
So something like this: 所以像这样:
class Category(MPTTModel):
name = models.CharField()
parent = models.ForeignKey("self", blank=True, null=True,
related_name="sub_category")
class MPTTMeta:
order_insertion_by = ['name']
Then you can rebuild your database with Category.tree.rebuild()
which should respect the ordering specified. 然后,您可以使用Category.tree.rebuild()
重建您的数据库, Category.tree.rebuild()
应遵循指定的顺序。
With recent mptt
versions (eg 0.8.7 ) you should use the TreeForeignKey
field: 使用最近的mptt
版本(例如0.8.7 ),您应该使用TreeForeignKey
字段:
from mptt.models import MPTTModel
from mptt.fields import TreeForeignkey
class Category(MPTTModel):
name = models.CharField()
parent = TreeForeignKey("self",
blank=True,
null=True,
related_name="sub_category")
class MPTTMeta:
order_insertion_by = ['name']
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