在 Django ModelForm 中过滤外键选择
假设您定义了以下模型：
class Company(models.Model):
name = ...
class Rate(models.Model):
company = models.ForeignKey(Company)
name = ...
class Client(models.Model):
name = ...
company = models.ForeignKey(Company)
base_rate = models.ForeignKey(Rate)目标是为了确保在创建客户端时，可用的费率选择仅限于父级内的费率选择
在Django 1.0 forms.py文件中：
from models import *
from django.forms import ModelForm
class ClientForm(ModelForm):
class Meta:
model = Client
def __init__(self, company_id, *args, **kwargs):
'''Filter the rate choices to only include those for the specified company'''
super(ClientForm, self).__init__(*args, **kwargs)
self.fields['base_rate'].queryset = Rate.objects.filter(company_id=company_id)在views.py中：
from django.shortcuts import render_to_response, get_object_or_404
from models import *
from forms import *
def addclient(request, company_id):
the_company = get_object_or_404(Company,>通过过滤分配给'rate的QuerySet ' 字段，'base_rate' 外键的可用选择仅限于指定公司内的适当费率。
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