在Django模型中循环时如何获取下一个obj [英] How to get the next obj when looping in the django model

问题描述

这是代码:

{% for o in page_obj.object_list %}
                <tr style="color:#4A3C8C;background-color:{% cycle '#E7E7FF' '#F7F7F7' %};"> 
                  <td align="center"> {{o.terminal_id}}</td>
                  <td align="center"> {{o.time_stamp}}</td> 
                  <td align="center" class="lat"> {{o.latitude|floatformat:"6"}}</td>
                  <td align="center" class="lng"> {{o.longitude|floatformat:"6"}}</td> 
                  <td align="center"> {{o.speed}}</td>
                  <td align="center"> 
                    <script>
                        $("script").last().parent().parent()
                    </script>
                  </td>
                  <td align="center"> {{o.speed}}</td>
                  <td align="center"> {{o.adress_reality}}</td> 
                </tr> 
            {%endfor%}

我想获得'o'对象之后的下一个对象. 如何从'o'对象获取下一个?或者，如何在python文件中获取下一个对象，以便可以在html中显示此对象，如下所示?

I want to get the next object after 'o' object. How do I get the next from the 'o' object? Alternatively, how to get the next object in the python file that i can show this in the html as shown below?

{{ o.next_obj }}

谢谢

推荐答案

您尝试使用get_next_by_FOO吗? https://docs.djangoproject. com/zh-CN/1.2/ref/models/instances/#django.db.models.Model.get_next_by_FOO

did you try to use get_next_by_FOO ? https://docs.djangoproject.com/en/1.2/ref/models/instances/#django.db.models.Model.get_next_by_FOO

如果不是实时生成字段，则可以(自然)添加到模型中:

If the field is not generated on the fly, you could add to your model (naively):

class MyObj(models.Model):
    lat = ...
    lon = ...
    def get_next_by_id(self):
        return self.objects.get(id=self.id+1)

并使用{{ o.get_next_by_id.lat }}

否则， templatetags 很好用，请参见标签部分，但需要更多代码. 如果您向我提供了您正在做的事情的更详细的示例，我可以尝试为您提供一个通用的模板标签，该标签可能适用于您的情况.

Otherwise it is a good use for the templatetags, see the tag section but require more code. If you provide me a more detailed example of what you are doing i could try to give you a generic templatetag which might work in your case.

祝你好运.

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