django 模板系统，在模型内部调用函数 [英] django template system, calling a function inside a model

问题描述

我想在模板中从我的模型中调用一个函数，例如:

I want to call a function from my model at a template such as:

class ChannelStatus(models.Model):
 ..............................
 ..............................

    def get_related_deltas(self,epk):
        mystring = ""
        if not self.get_error_code_delta(epk):
            return mystring
        else:
            for i in self.get_listof_outage():
                item = i.error_code.all()
                for x in item:
                    if epk == x.id:
                        mystring= mystring +" "+str(i.delta())
        return mystring         

当我想从模板中调用它时:假设在渲染时，我将 channel_status_list 传递为

And when I want to call this from the template: assume while rendering, I pass channel_status_list as

channel_status_list = ChannelStatus.objects.all()

{% for i in channel_status_list %}
  {{ i.get_related_deltas(3) }}
{% endfor %}

这不起作用，我可以调用一个不消耗任何东西的函数，但如果它有参数，则无法找到该怎么做

This doesn't work, I am able to call a function that consumes nothing, but couln't find what to do if it has parameter(s)

干杯

推荐答案

不能从模板调用带有参数的函数.您只能在视图中执行此操作.或者，您可以编写一个 自定义模板过滤器，可能看起来像这样:

You can't call a function with parameters from the template. You can only do this in the view. Alternatively you could write a custom template filter, which might look like this:

@register.filter
def related_deltas(obj, epk):
    return obj.get_related_deltas(epk)

所以现在您可以在模板中执行此操作:

So now you can do this in the template:

{% for i in channel_status_list %}
  {{ i|related_deltas:3 }}
{% endfor %}

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