Django传递外键进行查看

Question

Hi Perhaps someone could point me in the right direction, i am learning Django through Tango with Django and i am also following along with the official Django tutorials as well as creating my own Django app for purchase orders. 嗨，也许有人可以为我指出正确的方向，我正在与Django一起通过Tango学习Django，并且我还将跟随官方的Django教程以及为采购订单创建自己的Django应用。

I need to understand how I can access the Foreign key details of another Model and save it using forms. 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格将其保存。 Basically my app has Orders and Suppliers when creating an order I can get the supplier foreign key options to appear on the form but when I save it I also want to save with the suppier_name into the orders table currently it just saves with the supplier_id , I have searched through many examples of different scenarios but just can't understand it thanks. 基本上，创建订单，我可以得到供应商的外键的选项出现在表单上，但是当我保存它，我也想保存的，当我的应用程序有订单，供应商， suppier_name到订单表目前它只是用节省supplier_id ，我已经搜索了许多不同情况的示例，但无法理解，谢谢。

view.py 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
    )

model.py model.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 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 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>

Answer 1

To start with the question as-asked, you could capture this data in the model's save() method: 首先提出问题，您可以在模型的save（）方法中捕获以下数据：

class Order(models.Model):
    [...]
    def save(self, *args, **kw):
        if self.supplier_id is not None:
            self.supplier_name = self.supplier.supplier_name
        super(Order, self).save(*args, **kw)

HOWEVER, although there are some cases where the above might be correct (such as if supplier name is expected to change), it is much more typical to simply access a related field through the existing relationship, ex: 但是，尽管在某些情况下上述条件可能是正确的（例如，如果预计供应商名称会发生变化），但通过现有关系简单地访问相关字段会更为典型，例如：

myorder.supplier.supplier_name

Django传递外键进行查看

问题描述

1 个解决方案

解决方案1
0 已采纳 2015-01-26 20:30:28

Django传递外键进行查看

问题描述

1 个解决方案

解决方案1 0 已采纳 2015-01-26 20:30:28

解决方案1
0 已采纳 2015-01-26 20:30:28