如何使用django-smart-select [英] How to use django-smart-select

问题描述

假设我有以下模型：

class Location（models.Model）
continent = models.CharField（max_length = 20）
country = models.ForeignKey（Country）


我需要创建一个依赖的下拉列表当我选择一个大陆时，我得到属于该大陆的所有国家。我应该怎么做？

解决方案

你读过文档？这很简单取决于你的大陆/国家设置。我会推荐一些类似 django-cities-light 的内容，它为您提供了填充国家/地区。我不认为它有大陆。

如果你不想这样做，你需要设置一个国家模型，其中有一个列的Continent ID，例如：

  Continent（models.Model）：
 name = models.CharField（）
 
国家（models.Model）： 
 name = models.CharField（）
 continent = models.ForeignKey（Continent）
  

然后在位置模型中设置字段：

  from smart_selects.db_fields import ChainedForeignKey 
 
位置（models.Model）：
 newcontinent = models.ForeignKey（Continent）
 newcountry = ChainedForeignKey（
 Country，＃你从
填充你的国家的模型chained_field = newcontinent，＃这个字段链接到
 chained_model_field =continent的＃自己的模型的字段，＃对应于newcontentent的国家/地区的字段
 show_all = False，＃只显示对应的国家选择ed大陆在新大陆
）
  

从文档：

这个例子说明了Country Model有一个大陆= ForeignKey（Continent）字段。

链接字段是同一模型上的领域也应该链接。
链接的模型字段是链接模型的字段，对应于由链接字段链接的模型。

希望有道理

Let's say I have the following model:

class Location(models.Model) continent = models.CharField(max_length=20) country = models.ForeignKey(Country)

I need to create a dependent dropdown so that when I select a continent I get all countries belonging to that continent. How should I do it?

解决方案

Have you read the documentation? It's pretty straightforward. Depends on how you've got your continent/country set up. I'd recommend something like django-cities-light, which provides you with tables populated with countries/regions. I don't think it has continents though.

If you don't want to do that, you need to set up a Country model that has a column for Continent ID for example:

Continent(models.Model):
    name = models.CharField()

Country(models.Model):
    name = models.CharField()
    continent = models.ForeignKey(Continent)

Then in the Location model set the fields thus:

from smart_selects.db_fields import ChainedForeignKey 

Location(models.Model):
    newcontinent = models.ForeignKey(Continent) 
    newcountry = ChainedForeignKey(
        Country, # the model where you're populating your countries from
        chained_field="newcontinent", # the field on your own model that this field links to 
        chained_model_field="continent", # the field on Country that corresponds to newcontinent
        show_all=False, # only shows the countries that correspond to the selected continent in newcontinent
    )

From the docs:

This example asumes that the Country Model has a continent = ForeignKey(Continent) field.

The chained field is the field on the same model the field should be chained too. The chained model field is the field of the chained model that corresponds to the model linked too by the chained field.

Hope that makes sense.

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