python之django 表单动态属性查找

我遇到了一个问题，不知道如何解决。

我的申请中有以下表格:

class ContentForm(ModelForm): 
    class Meta: 
        model = Content 
        fields = ('url_1','url_2','url_3','url_4','url_5',) 
        widgets = { 
            'url_1': forms.URLInput(attrs={'class': 'form-control', 'maxlength': 100}), 
            'url_2': forms.URLInput(attrs={'class': 'form-control', 'maxlength': 100}), 
            'url_3': forms.URLInput(attrs={'class': 'form-control', 'maxlength': 100}), 
            'url_4': forms.URLInput(attrs={'class': 'form-control', 'maxlength': 100}), 
            'url_5': forms.URLInput(attrs={'class': 'form-control', 'maxlength': 100}), 
        } 

我想做的是通过循环动态生成这些 url 字段。我拍了this方法(实现动态属性查找的模板标签):

{% for i in 12345|make_list %} 
    {% with url='url_'|add:i %} 
      {{ form|getattribute:url }} 
    {% endwith %} 
{% endfor %} 

但是它不起作用。例如，Django 不呈现输入字段并提示我的表单对象没有名为 url_1 的属性。如果我直接为同一表单调用 url_1 属性，它就可以工作。

getattribute模板标签的实现同here .

[更新:在下面发布我的代码]

views.py

@login_required 
def new(request): 
    form = ContentForm() 
    return render(request, "new.html", {'form': form}) 

new.html

<form action="{% url 'create_content' %}" method="POST"> 
... 
{% include 'partials/urls.html' %} 
... 
</form> 

urls.html

{% load getattribute %} 
 
{% for i in 12345|make_list %} 
    {% with url='url_'|add:i %} 
      <label>URL {{i}}</label> 
      {{ form|getattribute:url }} 
    {% endwith %} 
{% endfor %} 

获取属性.py

import re 
from django import template 
from django.conf import settings 
 
numeric_test = re.compile("^\d+$") 
register = template.Library() 
 
def getattribute(value, arg): 
        """Gets an attribute of an object dynamically from a string name""" 
 
        return getattr(value, arg) 
 
    if hasattr(value, str(arg)): 
        return getattr(value, arg) 
    elif hasattr(value, 'has_key') and value.has_key(arg): 
        return value[arg] 
    elif numeric_test.match(str(arg)) and len(value) > int(arg): 
        return value[int(arg)] 
    else: 
        return settings.TEMPLATE_STRING_IF_INVALID 
 
register.filter('getattribute', getattribute) 

ps.: 运行的django版本是1.9.2

请您参考如下方法:

如下更改getattribute.py:

import re 
from django.forms import Form, ModelForm 
from django import template 
from django.conf import settings 
 
numeric_test = re.compile("^\d+$") 
register = template.Library() 
 
def getattribute(value, arg): 
    """Gets an attribute of an object dynamically from a string name""" 
    if hasattr(value, str(arg)): 
        return getattr(value, arg) 
    elif hasattr(value, 'has_key') and value.has_key(arg): 
        return value[arg] 
    elif numeric_test.match(str(arg)) and len(value) > int(arg): 
        return value[int(arg)] 
    elif issubclass(value.__class__, (Form, ModelForm)) and arg in value.fields: 
        return value[arg] 
    else: 
        return settings.TEMPLATE_STRING_IF_INVALID 
 
register.filter('getattribute', getattribute) 

您可以在第 17 行和第 18 行中看到预期的特殊条件，与表单相关并返回相关的呈现小部件；)