python - {{ field }} 如何在 django 模板中显示字段小部件？

Question

据我了解django template language , {{ variable }} 将通过以下方式之一显示该变量:

1. 变量本身就是一个字符串
2. 该变量是一个返回字符串的可调用对象
3. 变量的字符串表示

演示环节:

>>> from django.template import Template, Context
>>> template = Template("Can you display {{ that }}?")
>>> context = Context({"that":"a movie"})          #a string variable
>>> template.render(context)
u'Can you display a movie?'
>>> context2 = Context({"that": lambda:"a movie"}) #a callable
>>> template.render(context2)
u'Can you display a movie?'
>>> class Test:
...   def __unicode__(self):
...     return "a movie"
... 
>>> o = Test()
>>> context3 = Context({"that":o}) #the string representation
>>> template.render(context3)
u'Can you display a movie?'

显然，表单域不是这些情况中的任何一种。

演示环节:

>>> from django import forms
>>> class MyForm(forms.Form):
...   name = forms.CharField(max_length=100)
... 
>>> form = MyForm({"name":"Django"})
>>> name_field = form.fields["name"]
>>> name_field #a string variable?
<django.forms.fields.CharField object at 0x035090B0>
>>> str(name_field) #the string represetation?
'<django.forms.fields.CharField object at 0x035090B0>'
>>> name_field() #a callable?
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'CharField' object is not callable
>>> context4 = Context({"that":name_field})
>>> template.render(context4)
u'Can you display &lt;django.forms.fields.CharField object at 0x035090B0&gt;?'

看看最后一点，它实际上并没有像真正的模板那样呈现。

那么这样一个模板如何正确显示一个表单:

{% for field in form %}
    <div class="fieldWrapper">
        {{ field.errors }}
        {{ field.label_tag }} {{ field }}
    </div>
{% endfor %}

在这种情况下，字段如何转换为相应的小部件？

Answer 1

这一切归结为:

>>> str(form['name'])
'<input id="id_name" type="text" name="name" value="Django" maxlength="100" />'

我想这就是模板中的 for 循环迭代的内容。