django models内の関数が呼び出せない

models内の関数が呼び出せない

コード
models.py
```class OrderItem(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE)
    user_name = models.CharField(max_length=50,null=True,blank=True)
    user_email = models.CharField(max_length=50,null=True,blank=True)
    ordered = models.BooleanField(default=False)
    item = models.ForeignKey(Item,on_delete=models.CASCADE)
    quantity = models.IntegerField(default=1)
    order_day = models.DateField('注文日',default=timezone.now)
    store_name = models.CharField('店舗名',max_length=30,blank=True,null=True)

  
    def get_total_item_price(self):＃呼び出せる
        
        return int(self.quantity * self.item.price)
    
    def get_end_total(self):＃呼び出せない！
        total = 0
        for items in self.item:
            total += items.get_total_item_price()
　　　return total
    
    
    def __str__(self):
        return f'{self.item.title}:{self.quantity}'

views.py
class FindView(View):
    def get(self,request, *args, **kwargs):
        today = timezone.now()
        keyword = request.GET.get('keyword')
        
        order = OrderItem.objects.filter(store_name=keyword,order_day=today)
      
        context = {
            'order' :order,
            
            }

        return render(request,'order/order_data.html',context)

HTML
<tbody>
                        <tr>{% for order_data  in order %}
                            <td>{{ order_data.order_day }}</td>
                            <td>{{ order_data.user }}</td>
                            <td>{{ order_data.store_name }}</td>
                            <td>{{ order_data.item.item.title }}</td>
                            <td class="text-center">{{ order_data.quantity }}</td>
                            <td class="text-right">{{ order_data.get_total_item_price|intcomma }}</td>
                            
                           
                            
                        </tr>
                        
                        {% endfor %}
                    </tbody>
                    <tr>
                        <td></td>
                        <td></td>
                        <td></td>
                        
                        <td col="3"class="text-right"><h3>合計金額{{ order.get_end_total|intcomma }}円</h3>
                        </td>