【发布时间】：2015-03-25 07:44:28
【问题描述】：
嗨，也许有人能指出我正确的方向，我正在通过 Tango 和 Django 学习 Django，我也在关注 Django 官方教程以及创建我自己的 Django 应用程序用于采购订单。
我需要了解如何访问另一个模型的外键详细信息并使用表单保存它。基本上我的应用程序在创建订单时有订单和供应商我可以让供应商外键选项出现在表单上但是当我保存它时我还想用suppier_name保存到订单表中，目前它只是用@保存987654322@，我已经搜索了许多不同场景的示例，但无法理解。谢谢。
view.py
def add_order(request):
if request.method == 'POST':
form = OrderForm(request.POST)
if form.is_valid():
form.save(commit=True)
return orders(request)
else:
print(form.errors)
else:
form = OrderForm()
context_dict = {'form':form}
return render(
request,
'purchaseorders/add_order.html',
context_dict
)
模型.py
# Create your models here.
class Supplier(models.Model):
supplier_code = models.CharField(max_length=10)
supplier_name = models.CharField(
max_length=100,
unique=True
)
supplier_email = models.EmailField(max_length=100)
supplier_website = models.URLField(max_length=100)
slug = models.SlugField(unique=True)
def save(self, *args, **kwargs):
self.slug = slugify(self.supplier_name)
super(Supplier,self).save(*args, **kwargs)
def __unicode__(self):
return self.supplier_name
def __str__(self):
return self.supplier_name
class Meta:
verbose_name_plural = "Suppliers"
class Order(models.Model):
supplier = models.ForeignKey(Supplier)
po_number = models.IntegerField(default=0)
ordered_by = models.CharField(max_length=50)
order_date = models.DateTimeField()
supplier_name = models.CharField(max_length=50)
net_value = models.DecimalField(
decimal_places=2,
max_digits=10
)
class Meta:
verbose_name_plural = "Orders"
def __unicode__(self):
return self.po_number
forms.py
from django import forms
from PurchaseOrders.models import Supplier, Order
class SupplierForm(forms.ModelForm):
supplier_code = forms.CharField(
max_length=10,
help_text="Please enter a unique code"
)
supplier_name = forms.CharField(
max_length=100,
help_text="Please enter the Suppliers full name"
)
supplier_email = forms.EmailField(
max_length=100,
help_text="Please enter a email address"
)
supplier_website = forms.URLField(
max_length=100,
help_text="Please enter a website"
)
slug = forms.CharField(
widget=forms.HiddenInput(),
required=False
)
# an inline class to provide additional information on the form
class Meta:
# provide an association between the ModelForm and model
model = Supplier
fields = (
'supplier_code', 'supplier_name',
'supplier_email', 'supplier_website'
)
class OrderForm(forms.ModelForm):
#list all form details except the Foreignkey connection
po_number = forms.IntegerField(
help_text="please enter a PO Number"
)
ordered_by = forms.CharField(
max_length=50,
help_text="please enter your name"
)
order_date = forms.DateTimeField(
help_text="please enter a date of order"
)
#supplier_name = forms.ModelChoiceField(
queryset=Supplier.objects.all()
)
net_value = forms.DecimalField(
decimal_places=2,
max_digits=10,
help_text="please enter a net amount"
)
class Meta:
# provide an association between the ModelForm and model
model = Order
html
{% load staticfiles %} <!-- New line -->
<html>
<head>
<title>Purchase Orders</title>
</head>
<body>
<img src="{% static "purchaseorders/images/po_icon.png" %}"
alt="PO icon" />
<h1>Add a Order</h1>
<form id="order_form" method="post"
action="/PurchaseOrders/add_order/{{ supplier }}">
{% csrf_token %}
{% for hidden in form.hidden_fields %}
{{ hidden }}
{% endfor %}
<ul style="list-style-type:none ">
{% for field in form.visible_fields %}
<li></li>
{{ field.errors }}
{{ field.help_text }}
<li>{{ field }}</li>
{% endfor %}
</ul>
<input type="submit" name="submit" value="Add Order" />
</form>
</body>
</html>
【问题讨论】：
-
您为什么要这样做？这是不必要的数据重复。订单始终可以通过外键访问供应商名称，因此没有必要单独保存该名称的副本。
-
是的，我想我只是想了解如果我愿意，我该怎么做，然后就像你指出的那样意识到没有必要。
-
我的另一个想法是，如果我改为使用供应商模型中的另一个字段，我怎么能根据该字段找到 id 然后保存它，当我尝试这样做时，我会得到完整性空约束外键错误，