Django管理表单 - 如何更改动态选择值 [英] Django admin form - how to change dynamically select values

问题描述

我有这种情况：
我有模型项目，区域和国家。

I have that situation: I have models Item, Region and Country.

class Item(models.Model):
    name = models.CharField(max_length=255)
    alias = models.SlugField(unique=True)
    country = models.OneToOneField(Country, default=0)
    region = models.OneToOneField(Region, default=0, related_name='')

class Region(models.Model):
    name = models.CharField(max_length=100)
    country = models.ForeignKey(Country, default=0) 

class Country(models.Model):
    name = models.CharField(max_length=100)

当我在管理区域中添加项目并选择国家/地区时，我想自动构建区域选择与区域仅来自所选国家。

When I add an item in the admin area and I select country I want to automatically build the region select with Regions only from the selected Country.

我知道如何做javascript，但我不知道在Django中CORRECT是如何做的。

I know how to do it in javascript, but i don't know how CORRECT it is do that in Django.

推荐答案

你需要覆盖干净的会议您的管理员表单的hod：

You need to override the clean method of your admin form:

def clean(self):
    super(CustomItemForm, self).clean() #if necessary
    if 'region' in self._errors:
        """     
        reset the value (something like this i 
        think to set the value b/c it doesnt get set 
        b/c the field fails validation initially)
        """
        region = Region.objects.get(pk=self.data['region'])
        self.initial['region'] = region.id
        self.cleaned_data['region'] = region
        self.region = region

        # remove the error
        del self._errors['region']

    return self.cleaned_data 

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