Django modelformset_factory UnboundLocalError

Question

我收到错误消息 UnboundLocalError 局部变量 'Assumptions' 在赋值前引用（在 else: 行之后）。我想知道假设是一个模型并且被导入到 views.py，这怎么可能呢？任何建议如何解决它都将不胜感激。此外，我正在尝试基于 Assumptions modelform 创建多个表单并将它们保存到数据库模型 Assumptions 中。请告知此代码是否是正确的设计模式。谢谢。

views.py

from django.shortcuts import render
from .forms import  modelformset_factory, AssumptionsForm
from .models import Assumptions


def get_assumptions(request):

    if request.method == 'POST':

        if 'name' in request.POST:      

            formset = modelformset_factory(Assumptions, form = AssumptionsForm, extra = 5)

            if formset.is_valid():

                print('valid form')            

                for form in formset:

                    print('Looping forms')

                    Assumptions =  form.save(commit='False')
                    Assumptions.Name = 'name'
                    Assumptions.save()

    else:

        formset = modelformset_factory(Assumptions, form = AssumptionsForm, extra = 5)

    return render(request, 'assumptions.html', {'formset': formset})

assumptions.html

<div class="form">
<form action="" method="post">
{% csrf_token %}
{{ formset.management_form }}
{{ formset.non_form_errors.as_ul }}
{% for name in ['A', 'B'] %}
<h1>var</h1>
<table id="formset" class="form">
{% for form in formset.forms %}
  {% if forloop.first %}
  <thead><tr>
    {% for field in form.visible_fields %}
    <th>{{ field.label|capfirst }}</th>
    {% endfor %}
  </tr></thead>
  {% endif %}
  <tr class="{% cycle 'row1' 'row2' %}">
  {% for field in form.visible_fields %}
    <td>
    {# Include the hidden fields in the form #}
    {% if forloop.first %}
      {% for hidden in form.hidden_fields %}
      {{ hidden }}
      {% endfor %}
    {% endif %}
      {{ field.errors.as_ul }}
      {{ field }}
    </td>
  {% endfor %}
  </tr>
{% endfor %}
</table>

<input type="submit", name='name', value="save" />
{% endfor %}



</form>
</div>

forms.py

from django import forms
from django.forms import modelformset_factory, ModelForm
from .models import Assumptions

class AssumptionsForm(ModelForm):

    class Meta:
        model = Assumptions
        fields = ['Worst', 'Base', 'Best']
        exclude = ['Name']

models.py

from django.db import models
from django.forms import ModelForm

class Assumptions(models.Model):

    Worst = models.FloatField(null=True, blank=True, default=None)
    Base = models.FloatField(null=True, blank=True, default=None)
    Best = models.FloatField(null=True, blank=True, default=None)
    Name = models.TextField(null=True, blank=True, default=None)

Answer 1

您正在通过在此处为其分配新值来隐藏导入的 Assumptions 名称：

Assumptions =  form.save(commit='False')

您应该为您的模型实例使用不同的名称。通常的做法是使用小写名称，即

assumptions = form.save(commit='False')
assumptions.Name = 'name'
assumptions.save()

Django modelformset_factory UnboundLocalError

Django modelformset_factory UnboundLocalError

python

django

variables

local

formset