python - ModelFormSet 上的额外表单

Question

对于我的 Django 项目，我在模板中渲染模型表单集 election_formset = modelformset_factory(Election, except=('Complete',), formset=BaseElectionFormSet):

<form method="post" action="">
    {{ formset.management_form }}
    {% for form in formset %}
        <div class='card'>
            <div class='card-body w-75 mx-auto'>

                <div class='row'>
                    <div class='col-6 text-center'>
                        <p>Name<br>{{form.Name}}</p>
                    </div>
                    <div class='col-6 text-center'>
                        <p>Videos<br>{{form.FlipGrid}}</p>
                    </div>
                </div>
                <div class='row'>
                    <div class='col-12 text-center'>
                        <p>Description<br>{{form.Description}}</p>
                    </div>
                </div>
                <div class='row'>
                    <div class='col-6 text-center'>
                        <p>Allow registration: {{form.CandidateReg}}</p>
                    </div>
                    <div class='col-6 text-center'>
                        <p>Allow voting: {{form.VotingOpen}}</p>
                    </div>
                </div>
            </div>
        </div>
    {% endfor %}
</form>

当表单集呈现时，表单末尾会显示一个额外的空白表单。我只希望表单显示现有记录的实例。为什么会出现额外的空白表单集？如何防止出现这种情况？

Answer 1

试试这个

election_formset = modelformset_factory(
    Election,
    exclude=('Complete',),
    formset=BaseElectionFormSet,
    extra=0
)

extra 关键字默认为 1，否则(请参阅 docs ):

def modelformset_factory(model, form=ModelForm, formfield_callback=None,
                         formset=BaseModelFormSet, extra=1, can_delete=False,
                         can_order=False, max_num=None, fields=None, exclude=None,
                         widgets=None, validate_max=False, localized_fields=None,
                         labels=None, help_texts=None, error_messages=None,
                         min_num=None, validate_min=False, field_classes=None):