我有一个带有一些假字段的ModelForm，我在保存模型时会稍后处理。
class MyForm(forms.ModelForm):
field1= forms.IntegerField(min_value=0)
field2= forms.ChoiceField(choices=SIDES_CHOICES, required=True)
field3= forms.CharField(max_length=140, required=False)
我需要的是根据我们是添加新实例还是更改现有实例来显示或隐藏其中一些实例。
我读到的只是隐藏模型中定义的真实字段，但不是我的情况。 “假”是指不在模型或数据库中的字段，仅在表单中定义。
我在ModelForm的__init__覆盖中试过这个：
def __init__(self, *args, **kwargs):
super(MyForm, self).__init__(*args, **kwargs)
if not self.instance.pk:
del self.fields['field1']
但是我收到了这个错误：
Key 'field1' not found in 'MyForm'
整个错误追溯：
Template error:
In template C:\Python34\lib\site-packages\django_suit-0.2.18-py3.4.egg\suit\templates\admin\change_form.html, error at line 19
Key 'field1' not found in 'MyForm' 9 : {{ media }}
10 :
11 : {% endblock %}
12 :
13 :
14 : {% block extrajs %}
15 : {{ block.super }}
16 :
17 : {% if 'CONFIRM_UNSAVED_CHANGES'|suit_conf %}
18 : <!-- Warn on leaving unsaved form -->
19 : <script src="{% static 'suit/js/suit-form- confirm.js' %}"></script>
20 : <script type="text/javascript">
21 : confirmExitIfModified('{% firstof opts.model_name opts.module_name %}_form', '{% trans 'You have unsaved changes' %}.');
22 : </script>
23 : {% endif %}
24 :
25 : {% if adminform.model_admin.suit_form_tabs %}
26 : <script type="text/javascript">
27 : (function ($) {
28 : $(function () {
29 : $('#suit_form_tabs').suit_form_tabs();
Traceback:
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\forms\forms.py" in __getitem__
141. field = self.fields[name]
During handling of the above exception ('field1'), another exception occurred:
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\core\handlers\base.py" in get_response
174. response = self.process_exception_by_middleware(e, request)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\core\handlers\base.py" in get_response
172. response = response.render()
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\response.py" in render
160. self.content = self.rendered_content
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\response.py" in rendered_content
137. content = template.render(context, self._request)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\backends\django.py" in render
95. return self.template.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render
206. return self._render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in _render
197. return self.nodelist.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render
992. bit = node.render_annotated(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render_annotated
959. return self.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\loader_tags.py" in render
173. return compiled_parent._render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in _render
197. return self.nodelist.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render
992. bit = node.render_annotated(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render_annotated
959. return self.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\loader_tags.py" in render
173. return compiled_parent._render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in _render
197. return self.nodelist.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render
992. bit = node.render_annotated(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render_annotated
959. return self.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\loader_tags.py" in render
69. result = block.nodelist.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render
992. bit = node.render_annotated(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render_annotated
959. return self.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\loader_tags.py" in render
69. result = block.nodelist.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render
992. bit = node.render_annotated(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render_annotated
959. return self.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render
1043. output = self.filter_expression.resolve(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in resolve
709. obj = self.var.resolve(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in resolve
850. value = self._resolve_lookup(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in _resolve_lookup
913. current = current()
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\loader_tags.py" in super
83. return mark_safe(self.render(self.context))
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\loader_tags.py" in render
69. result = block.nodelist.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render
992. bit = node.render_annotated(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render_annotated
959. return self.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\loader_tags.py" in render
69. result = block.nodelist.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render
992. bit = node.render_annotated(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render_annotated
959. return self.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\loader_tags.py" in render
69. result = block.nodelist.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render
992. bit = node.render_annotated(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render_annotated
959. return self.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\defaulttags.py" in render
220. nodelist.append(node.render_annotated(context))
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render_annotated
959. return self.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\loader_tags.py" in render
209. return template.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render
208. return self._render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in _render
197. return self.nodelist.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render
992. bit = node.render_annotated(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render_annotated
959. return self.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\defaulttags.py" in render
220. nodelist.append(node.render_annotated(context))
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render_annotated
959. return self.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\defaulttags.py" in render
584. return self.nodelist.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render
992. bit = node.render_annotated(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in render_annotated
959. return self.render(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\defaulttags.py" in render
319. match = condition.eval(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\defaulttags.py" in eval
951. return self.value.resolve(context, ignore_failures=True)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in resolve
709. obj = self.var.resolve(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in resolve
850. value = self._resolve_lookup(context)
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\template\base.py" in _resolve_lookup
913. current = current()
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\contrib\admin\helpers.py" in errors
117. for f in self.fields if f not in self.readonly_fields).strip('\n')
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\contrib\admin\helpers.py" in <genexpr>
117. for f in self.fields if f not in self.readonly_fields).strip('\n')
File "C:\Python34\lib\site-packages\django-1.9.6-py3.4.egg\django\forms\forms.py" in __getitem__
144. "Key %r not found in '%s'" % (name, self.__class__.__name__))
答案 0 :(得分：0)
如果表单用于模型的新实例，则您将从field1中的表单中删除__init__。关键错误意味着ModelForm代码中至少有一个位置在您删除它之后引用field1（对于新实例）。如果错误追溯没有指向生成错误的行，只需搜索代码中field1的出现次数，并确保您之前正在测试新实例你执行这些代码部分。
修改
由于表单被用作AdminForm，请在模型框架中注释掉您删除field1的行，并根据对Remove fields from ModelForm的回答将以下内容添加到您的ModelAdmin中：
def get_form(self, request, obj=None, **kwargs):
form = super().get_form(request, obj=obj, **kwargs)
if not obj:
self.exclude = ['field1',]
return form