python - django 表单动态属性查找

Question

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

Answer 1

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；)