无法分配“'Nokia1200'”：“ Order.pname”必须是“ Product”实例

Question

我有一个“产品”模型，其中提供了产品的所有详细信息，而我有一个“订单”模型，其中带有产品模型的外键。我正在过滤特定字段上的详细信息，并尝试在Order Model中添加该字段。 我将这种概念应用于特定领域，例如：Product.objects.filter（pname ='Nokia1200'）。values（'pname'，'catgry'，'brand'）。 但这产生了一条错误消息。

Form.html

                   <form class="well form-horizontal" method="post" action="{% url 'new_order' %}">
                {% csrf_token %}
                  <fieldset>
                     {% for n in ListPrdt %}
                     <div class="form-group">
                        <label class="col-md-4 control-label">Select Product</label>
                        <div class="col-md-6 inputGroupContainer">
                           <div class="input-group">
                              <span class="input-group-addon" style="max-width: 100%;"><i class="glyphicon glyphicon-list"></i></span>
                              <select class="selectpicker form-control" name="pname">                          
                                <option>{{n.pname}}</option>                                     
                              </select>
                           </div>
                        </div>
                     </div>

                    <div class="form-group">
                        <label class="col-md-4 control-label">Category Name</label>
                        <div class="col-md-6 inputGroupContainer">
                           <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-user"></i></span>
                            <input id="fullName" name="catgry" placeholder="Full Name" class="form-control" required="true" value="{{n.catgry}}" type="text">
                          </div>
                        </div>
                     </div>

                     <div class="form-group">
                        <label class="col-md-4 control-label">Brand Name</label>
                        <div class="col-md-6 inputGroupContainer">
                           <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-user"></i></span>
                            <input id="fullName" name="brand" placeholder="Full Name" class="form-control" required="true" value="{{n.brand}}" type="text">
                          </div>
                        </div>
                     </div>
                     {% endfor %}
                     <div class="form-group">
                        <label class="col-md-4 control-label">Quantity</label>
                        <div class="col-md-6 inputGroupContainer">
                           <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-envelope"></i></span><input id="email" name="qnty" placeholder="Email" class="form-control" required="true" value="" type="text"></div>
                        </div>
                     </div>
                     <div class="form-group">
                        <label class="col-md-4 control-label">Price</label>
                        <div class="col-md-6 inputGroupContainer">
                           <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-earphone"></i></span><input id="phoneNumber" name="price" placeholder="Phone Number" class="form-control" required="true" value="" type="text"></div>
                        </div>
                     </div>

                     <div class="form-group">
                        <label class="col-md-4 control-label">Tax</label>
                        <div class="col-md-6 inputGroupContainer">
                           <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-home"></i></span><input id="addressLine2" name="tax" placeholder="Address Line 2" class="form-control" required="true" value="" type="text"></div>
                        </div>
                     </div>
                     <div class="form-group">
                        <label class="col-md-4 control-label">Total</label>
                        <div class="col-md-6 inputGroupContainer">
                           <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-home"></i></span><input id="city" name="total" placeholder="City" class="form-control" required="true" value="" type="text"></div>
                        </div>
                     </div>
                     <div class="form-group">
                        <label class="col-md-4 control-label">Delivery Date</label>
                        <div class="col-md-6 inputGroupContainer">
                           <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-home"></i></span><input id="state" name="deliverydt" placeholder="State/Province/Region" class="form-control" required="true" value="" type="text"></div>
                        </div>
                     </div>
                     <div class="form-group">
                        <label class="col-md-4 control-label">Remarks</label>
                        <div class="col-md-6 inputGroupContainer">
                           <div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-home"></i></span><input id="postcode" name="remark" placeholder="Postal Code/ZIP" class="form-control" required="true" value="" type="text"></div>
                        </div>
                     </div>
                     <div class="form-group">
                        <label class="col-md-4 control-label">Select Brand</label>
                        <div class="col-md-6 inputGroupContainer">
                           <div class="input-group">
                              <span class="input-group-addon" style="max-width: 100%;"><i class="glyphicon glyphicon-list"></i></span>
                              <select class="selectpicker form-control" name="conrej" disabled>

                                 <option>Confirm</option>
                                 <option>Rejected</option>

                              </select>
                           </div>
                        </div>
                     </div>
                    <button>Submit</button>

                  </fieldset>
               </form>

Model.py

class Order(models.Model):
Reject = 'RJ'
Confirm = 'CN'
confchoice = ((Reject, 'Reject'),(Confirm, 'Confirm'),)
pname = models.ForeignKey(Product, on_delete=models.CASCADE)
catgry = models.CharField(max_length=10)
brand = models.CharField(max_length=50)
qnty = models.CharField(max_length=10)
price = models.CharField(max_length=20)
tax = models.CharField(max_length=20)
total = models.CharField(max_length=20)
deliverydt = models.CharField(max_length=20)
remark = models.CharField(max_length=10)
conrej = models.CharField(max_length=10, choices=confchoice,  default="Reject")

def __str__(self):
    return self.remark

Views.py

def NewOrder(request):
add_prdt = Product.objects.filter(pname='Nokia1200').values('pname','catgry','brand')
return render(request, 'neworder.html', {'ListPrdt' : add_prdt})

产品型号

class Product(models.Model):
pname = models.CharField(max_length=50)
catgry = models.CharField(max_length=20)
brand = models.CharField(max_length=20)
price = models.CharField(max_length=10)
qnty = models.CharField(max_length=10)
vname = models.CharField(max_length=50)
mfd = models.CharField(max_length=20)
exp = models.CharField(max_length=10)
height = models.CharField(max_length=10)
width = models.CharField(max_length=10)
color = models.CharField(max_length=10)
wght = models.CharField(max_length=10)
remark = models.CharField(max_length=50)
hsn = models.CharField(max_length=10)

def __str__(self):
    return self.pname

Views.py文件（用于在订单模型中添加新订单）

def new_order(request):
pname = request.POST.get("pname", False)
catgry = request.POST.get("catgry", False)
brand = request.POST.get("brand", False)
qnty = request.POST.get("qnty", False)
price = request.POST.get("price", False)
tax = request.POST.get("tax", False)
total = request.POST.get("total", False)
deliverydt = request.POST.get("deliverydt", False)
remark = request.POST.get("remark", False)
OrderNew = Order(pname = pname, catgry = catgry, brand = brand, qnty = qnty, price = price, tax = tax, 
                total = total, deliverydt = deliverydt, remark = remark)
OrderNew.save()

return render(request,'neworder.html')

Answer 1

您的过滤器查询是：

product=Product.objects.filter(name='Nokia1200').first()

Order.objects.create(pname=product,.......)

Answer 2

似乎“订单”表中的pname是产品表的外键。您不能将值分配给外键列，而应该分配产品对象。

做这样的事情。

pn=Product.objects.get(pname='nokia')
Order.objects.create(pname=pn,.....)