django 模板标签中 formset 和 formset.forms 的区别

Difference between formset and formset.forms in django template tags

我正在尝试在我的模板上的表单集中遍历表单。而且我已经看到了两种不同的方法来执行此操作,而且我使用哪种方法似乎对我的代码没有影响。

{{ formset.management_form }}
    {% for form in formset %}
        {{ form }}
        {% endfor %}

还有...

{{ formset.management_form }}
    {% for form in formset.forms %}
        {{ form }}
        {% endfor %}

这有什么区别吗?为什么要把 .forms 放在最后?

根据 BaseFormset class 的来源:

def __iter__(self):
    """Yields the forms in the order they should be rendered"""
    return iter(self.forms)

@cached_property
def forms(self):
    """
    Instantiate forms at first property access.
    """
    # DoS protection is included in total_form_count()
    forms = [self._construct_form(i, **self.get_form_kwargs(i))
             for i in range(self.total_form_count())]
    return forms

两种方法(for form in formsetfor form in formset.forms)是相同的。

你看,用于 for 循环的 __iter__ 每次 self.forms 都会产生。另一方面,for form in formset.forms 迭代相同的东西,即 self.forms.