如何在Django中进行过滤查询？ [英] How to make filter query in Django?

问题描述

我有以下 model.py 。我想在输入期间创建一个过滤器。 SubCategory自动从成员Category中提取。子类别中的输入电流将显示所有内容而无需过滤器。我想选择一个父母，然后仅从父母的成员中选择。

I have the following model.py. I want to create a filter during Input. SubCategory automatically extracted from members Category. While the input current during subcategory will display the entire contents without filter. I want to choose one parent, then just out of the parent's members only.

> from django.db import models
> 
> > class Category(models.Model):
> >     name = models.CharField(max_length=100)
> >     
> >     def __unicode__(self):
> >         return self.name
> > 
> > class SubCategory(models.Model):
> >     name = models.CharField(max_length=50)
> >     category = models.ForeignKey(Category)
> >     
> >     def __unicode__(self):
> >         return self.name
> > 
> > class Input(models.Model):
> >     name = models.CharField(max_length=30)
> >     category = models.ForeignKey(Category)
> >     subcategory = models.ForeignKey(SubCategory)
> >     
> >     def __unicode__(self):
> >         return self.name

推荐答案

看看过滤器文档。

要获取一组类别由类别 my_cat 填充的子类别，您可以-

To get a group of subcategories whose category field is populated by the category my_cat, you would do -

sub_cats = SubCategory.objects.filter(category=my_cat)

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