问题描述
我正在尝试创建一个包含条件的OnetoOne子模型的ModelForm。对于上下文，我将模型的相关部分总结如下：
models.py
class Quote(models.Model):
...
class ScreenoperationType(models.Model):
...
class Screen(models.Model):
quote = models.ForeignKey(Quote,on_delete=models.PROTECT)
operation_type = models.ForeignKey(ScreenoperationType,on_delete=models.PROTECT)
...
class ScreenMotor(models.Model):
screen = models.OnetoOneField(Screen,on_delete=models.PROTECT)
...
class ScreenCrank(models.Model):
screen = models.OnetoOneField(Screen,on_delete=models.PROTECT)
...
报价可以具有任意数量的屏幕。屏幕具有以下四种操作类型之一：电动机，曲柄，固定或无。仅当operation_type为'motor'时存在ScreenMotor子记录，仅当screen operation_type为'crank'时存在ScreenCrank子记录。如果操作固定或不执行，则不存在子记录。
我想以相同的形式创建所有嵌套记录。我已经为带子屏幕内联表单的报价创建了一个表单，但是如何在Screen ModelForm中包括ScreenMotor和ScreenCrank的字段？我曾尝试为ScreenCrank和ScreenMotor编写一个ModelForm，但是将它们嵌套为另一个表单集似乎并不会产生预期的结果，因为它们是OnetoOne。
我知道我将不得不编写javascript来显示/隐藏给孩子的输入，但是现在我很高兴只一次显示Screen，ScreenMotor和ScreenCrank的输入，并让QuoteCreateView form_valid函数确定哪些字段相关。
forms.py：
import re
from crispy_forms.helper import FormHelper
from crispy_forms.layout import Layout,Field,Fieldset,Div,HTML,ButtonHolder,Submit,Row
from django import forms
from django.forms.models import inlineformset_factory
from .custom_layout_object import Formset
from .models import Screen,Quote
class ScreenMotorForm(forms.ModelForm):
class Meta:
model = ScreenMotor
fields = ('color','motor_type',)
class ScreenCrankForm(forms.ModelForm):
class Meta:
model = ScreenCrank
fields = ('position','length',)
class ScreenForm(forms.ModelForm):
# How do I add fields for ScreenMotorForm and ScreenCrankForm to this?
class Meta:
model = Screen
fields = ('fabric_color','quote',)
def __init__(self,*args,**kwargs):
super().__init__(*args,**kwargs)
formtag_prefix = re.sub('-[0-9]+$','',kwargs.get('prefix',''))
self.helper = FormHelper(self)
self.helper.form_tag = False
self.helper.render_hidden_fields = True
self.helper.layout = Layout(
Row(
Field('fabric_color'),Field('DELETE'),css_class='formset_row-{}'.format(formtag_prefix)
)
)
ScreenFormSet = inlineformset_factory(
Quote,Screen,form=ScreenForm,fields=['fabric_color'],extra=1,can_delete=True
)
class QuoteForm(forms.ModelForm):
class Meta:
model = Quote
fields = ('status',**kwargs):
super(QuoteForm,self).__init__(*args,**kwargs)
self.helper = FormHelper()
self.helper.form_tag = True
self.helper.layout = Layout(
Div(
Fieldset(
'Add screens',Formset('screens')
),Field('status'),HTML('<br>'),ButtonHolder(Submit('submit','save')),)
)
views.py
from django.views.generic import CreateView
from django.urls import reverse
from django.contrib.auth.mixins import LoginrequiredMixin,PermissionrequiredMixin
from django.db import transaction
class QuoteCreateView(LoginrequiredMixin,PermissionrequiredMixin,CreateView):
permission_required = 'quotes.add_quote'
model = Quote
form_class = QuoteForm
def get_context_data(self,**kwargs):
data = super(QuoteCreateView,self).get_context_data(**kwargs)
if self.request.POST:
data['screens'] = ScreenFormSet(self.request.POST)
else:
data['screens'] = ScreenFormSet()
return data
def form_valid(self,form):
context = self.get_context_data()
screens = context['screens']
with transaction.atomic():
form.instance.written_by = self.request.user
self.object = form.save()
if screens.is_valid():
screens.instance = self.object
screens.save()
return super(QuoteCreateView,self).form_valid(form)
def get_success_url(self):
return reverse('quotes:detail',args=[str(self.object.id)])
quote_form.html
{% extends 'main/base.html' %}
{% load crispy_forms_tags %}
{% block content %}
<form method="post">
{% csrf_token %}
{% crispy form %}
</form>
{% endblock %}
这可能无关紧要，但我应该注意，我基于发现的here解决方案使用了第三方django-crispy-forms和django-dynamic-formset。我是Django的新手，所以能提供的任何帮助将不胜感激。
解决方法
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