Question

我有一个json来自以下格式的视图，

[  
    {  
        "model":"booking.bookeditem",
        "pk":192,
        "fields":{  
            "Booking_id":155,
            "hoarding":9,
            "date_from":"2017-11-21",
            "date_until":"2017-12-06",
            "price_net":"34500",
            "created":"2017-11-07T11:35:49.675Z"
        }
    }
]

我需要遍历此json并将其打印在模板中。实际上，我想在执行预订后为用户创建发票电子邮件，因为我将bookeditems作为上下文传递给电子邮件模板。

以下是创建预订的视图，

views.py:

def create_order(request,checkout):
    booking = checkout.create_order()
    if not booking:
        return None, redirect('cart:index')
    checkout.clear_storage()
    checkout.cart.clear()
    bookingitems = BookedItem.objects.filter(Booking_id=booking.pk)
    booking.send_invoice_email(booking,user,bookingitems)
    return booking, redirect('home')

发送发票电子邮件的功能

def send_invoice_email(self,booking,user,bookingitems):
        customer_email = self.get_user_current_email()
        data = serializers.serialize('json',bookingitems)
        subject ="invoice"
        ctx = {
                 'hoardings':data
              }
        send_invoice.delay(customer_email, subject, ctx)

我正在使用celery&django EmailMessage发送发票电子邮件。

task.py：

@shared_task(name="task.send_invoice")
def send_invoice(customer_email, subject, ctx):
    to=[customer_email]
    from_email = 'example@gmail.com'
    message = get_template('email/invoice_email.html').render(ctx)
    msg = EmailMessage(subject,message,to=to,from_email=from_email)
    msg.content_subtype = 'html'
    msg.send()

我试过了：

 {% for i in hoardings %}
        <tr>
           <td>{{ i.pk }}</td>
        </tr>
   {% endfor %}

但它不起作用，循环正在为每个字符串迭代。

我在迭代中哪里出错了？请帮忙..

Answer 1

您已获得list个JSON对象，因此当您对其进行迭代时，您会在dict变量中获得i。要访问列表中的数据，您必须使用

迭代它的项目

{% for i in hoardings %}
    {% for k, v in i.items() %}
    <tr>
        <td>{{ k.pk }}</td> #or just v if you need only values displayed in template
    </tr>
    {% endfor %}
{% endfor %}

Answer 2

为什么要将它转换为JSON？如果要在模板中使用它，只需将其作为字典传递：

{% for i in hoardings %}
    <tr>
       <td>{{ i.pk }}</td>
       <td>{{ i.title }}</td>
    </tr>
{% endfor %}

在你的模板中：

string

我认为不需要先将其转换为JSON。这就是你遇到的问题。它以JSON的形式传递给模板，因此您无法将其作为字典循环。如果你想这样做，你需要找到一个模板标签或过滤器，以便将private static void findTheRepeatedChar(char[] characters) { /* * logic: char are inserted as keys and their count as values. If map * contains the char already then increase the value by 1 */ Map<Character, Integer> map = new HashMap<Character, Integer>(); for (Character character : characters) { if (map.containsKey(character)) { map.put(character, map.get(character) + 1); } else { map.put(character, 1); } } // Obtaining set of keys Set<Character> keys = map.keySet(); /* * Display count of chars if it is greater than 1. All duplicate chars * would be having value greater than 1. */ for (Character ch : keys) { if (map.get(ch) > 1) { System.out.println("Char " + ch + " " + map.get(ch)); } } }转换为字典，这样你就可以像普通字典一样循环它。

Answer 3

将bookingitems序列化为OrderDict项列表，而不是JSON字符串。

作为普通的Python对象，任务很容易被挑选并放在任务队列中。同样，在此格式中，消息代理能够将此任务传递给工作者。

def send_invoice_email(self, booking, user, bookingitems):
    customer_email = self.get_user_current_email()
    data = serializers.serialize('python', bookingitems)
    subject = 'invoice'
    ctx = {
        'hoardings': data
    }
    send_invoice.delay(customer_email, subject, ctx)

在电子邮件模板中，循环显示OrderDict。

列表

{% for queryset in hoardings %}
    <tr>
        <td>{{ queryset.pk }}</td>
    </tr>
{% endfor %}

在django模板中迭代JSON

3 个答案: