Django模板：如何访问一个等于变量值的表单域？ [英] Django templates: How to access a form field equal to a variable value?

问题描述

想象一下下面的用例：我有一个报告模板的字典。每个报告模板都有一个ID和一个名称。它看起来或多或少是这样的：

Imagine a following use case: I have a dictionary of report templates. Each report template has an ID and a name. It looks more or less like this:

reports = [ { 'ID' : 'A1',
              'NAME' : 'special report 1 for department A',
              ... (other fields irrelevant to the question's matter)
            },
            { 'ID' : 'X9',
              'NAME' : 'special report 9 for department X',
              ... (other fields irrelevant to the question's matter)
            },
          ]

访问和可见性的报告将被存储在数据库中。

我创建了一个字段名称等于报告ID。一切顺利，直到我必须在模板中显示表单。我不知道如何访问正确的表单的字段。此语法无效：

Access to and visibility of the reports are to be stored in a database.
I created a form with field names equal to reports' IDs. And everything goes fine until the moment I have to show the form in the template. I don't know how to access the proper form's field. This syntax doesn't work:

{% for report in reports %}
<tr>
    <td>{{ report.ID }}</td>
    <td>{{ report.NAME }}</td>

    <td>{{ form.report.ID }}</td>

</tr>
{% endfor %} 

另外：

{% for report in reports %}
<tr>
    <td>{{ report.ID }}</td>
    <td>{{ report.NAME }}</td>
    {% with report.ID as key %}     
    <td>{{ form.key }}</td>
    {% endwith %}
</tr>
{% endfor %} 

无效。

语法应该如何？在下面的代码中应该放置什么而不是问号？

How should the syntax look like? What should be placed instead of the question marks in the code below?

{% for report in reports %}
<tr>
    <td>{{ report.ID }}</td>
    <td>{{ report.NAME }}</td>

    <td>{{ form.??? }}</td>

</tr>
{% endfor %} 

我越过了这个解决方案： Django模板：表单字段名称作为变量，我想我将不得不使用它没有其他办法可以解决我的问题。

I crossed upon this solution: Django Templates: Form field name as variable? and I guess I'll have to use it if there won't be any other way to solve my problem.

推荐答案

这是不鼓励的，因为模板应该尽可能没有逻辑。但是，实际上，这一直都出现了。您可以制作一个模板过滤器：

It's discouraged because the templates are supposed to be as without logic as possible. But, in practice, this comes up all the time. You can make a template filter that does this:

@register.filter(name='get')
def get(o, index):
    try:
        return o[index]
    except:
        return settings.TEMPLATE_STRING_IF_INVALID

然后，在模板中，正确加载模板库后：

Then, in the template, after you load the templatetags library appropriately:

{% for report in reports %}
<tr>
    ...
    <td>{{ form|get:report.ID }}</td>
</tr>
{% endfor %} 

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