迭代嵌套的FormField

Question

我试图在FormField中迭代Formfield，这两者都是FieldList的一部分。

在我的views.py中，我调用mainForm，模板成功地遍历FormField subForm。但是，当我无法让迭代通过subSubForm工作时。这些字段永远不会出现在浏览器中。

格式代码：

class subSubForm(Form):
    step = IntegerField("step", validators=[NumberRange(min=0, max=99)])
    description = TextField("Description")
    information = TextAreaField("Information Exchanged")])

class subForm(Form):
    name = TextField("Description")
    step = FieldList(FormField(subSubForm), min_entries=1)

class mainForm(Form):
   sub_form = FieldList(FormField(subForm), min_entries=1)

和Jinja2模板：

{% for sub_form in form.sub_form %}
      {{ sub_form.form.name(placeholder='Scenario Title') }}
      {% for error in name %}
             {{error}}
      {% endfor %}

      {% for step in form.sub_form %}
            {{ step.form.id(placeholder='#') }}  
            {{ step.form.description(placeholder='description') }}
            {{ step.form.information(placeholder='info xch') }}
       {% endfor %}
   {% endfor %}
{% endfor %}

以上仅显示了sub_form.form.name-field。如何进行嵌套迭代，以便同时显示step字段？

Answer 1

看起来您在模板中的第二个嵌套循环中犯了错误。这是它的固定版本：

{% for sub_form in form.sub_form %}
      {{ sub_form.form.name(placeholder='Scenario Title') }}
      {% for error in name %}
             {{error}}
      {% endfor %}

      {% for step in sub_form.step %}
            {{ step.form.step(placeholder='#') }}  
            {{ step.form.description(placeholder='description') }}
            {{ step.form.information(placeholder='info xch') }}
      {% endfor %}
{% endfor %}

这将显示为：

<input id="sub_form-0-name" name="sub_form-0-name" placeholder="Scenario Title" type="text" value="">
<input id="sub_form-0-step-0-step" name="sub_form-0-step-0-step" placeholder="#" type="text" value="">  
<input id="sub_form-0-step-0-description" name="sub_form-0-step-0-description" placeholder="description" type="text" value="">
<textarea id="sub_form-0-step-0-information" name="sub_form-0-step-0-information" placeholder="info xch"></textarea>