45

对于类似错误的问题，我找不到任何解决方案。

错误是当我尝试编辑对象时：

'Intention' 对象没有属性 'get'

我有它符合form.as_p：

{% extends "layout.html" %}
{% block content %}
    <form action="{{ form_url }}" method="post">{% csrf_token %}
    {{ form.as_p }}
    <input type="submit" value="Submit" />
    </form>
{% endblock %}

控制器代码：

def edit(request, id):
    if request.method == 'POST': # If the form has been submitted...
        form = IntentionForm(request.POST) # A form bound to the POST data
        if form.is_valid(): # All validation rules pass
            # Process the data in form.cleaned_data
            # ...
            intention = form.save()
            return HttpResponseRedirect(reverse_lazy('intention-show', args=[intention.id])) # Redirect after POST
    else:
        intention = Intention.objects.get(pk=id)
        form = IntentionForm(intention) # An unbound form

    return render_to_response('intentions/templates/form.html', 
                                {'form': form, 'form_url': reverse_lazy('intention-edit', args=[intention.id])},
                                 context_instance=RequestContext(request)  
                             )

有人可以给我任何建议吗？

追溯：

Environment:


Request Method: GET
Request URL: http://127.0.0.1:8000/intentions/3/edit

Django Version: 1.4
Python Version: 2.7.3
Installed Applications:
('django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'intentions',
 'django.contrib.admin')
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware')


Template error:
In template /home/marek/devel/django/prayer/intentions/templates/form.html, error at line 4
   'Intention' object has no attribute 'get'
   1 : {% extends "layout.html" %}


   2 : {% block content %}


   3 :  <form action="{{ form_url }}" method="post">{% csrf_token %}


   4 :   {{ form.as_p }} 


   5 :  <input type="submit" value="Submit" />


   6 :  </form>


   7 : {% endblock %}


   8 : 

Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/home/marek/devel/django/prayer/intentions/views.py" in edit
  55.                                  context_instance=RequestContext(request)  
File "/usr/local/lib/python2.7/dist-packages/django/shortcuts/__init__.py" in render_to_response
  20.     return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/template/loader.py" in render_to_string
  176.         return t.render(context_instance)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render
  140.             return self._render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in _render
  134.         return self.nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render
  823.                 bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  74.             return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py" in render
  123.         return compiled_parent._render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in _render
  134.         return self.nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render
  823.                 bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  74.             return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py" in render
  62.             result = block.nodelist.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render
  823.                 bit = self.render_node(node, context)
File "/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in render_node
  74.             return node.render(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in render
  84.             output = self.filter_expression.resolve(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in resolve
  571.                 obj = self.var.resolve(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in resolve
  721.             value = self._resolve_lookup(context)
File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in _resolve_lookup
  772.                             current = current()
File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py" in as_p
  238.             errors_on_separate_row = True)
File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py" in _html_output
  143.         top_errors = self.non_field_errors() # Errors that should be displayed above all fields.
File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py" in non_field_errors
  246.         return self.errors.get(NON_FIELD_ERRORS, self.error_class())
File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py" in _get_errors
  115.             self.full_clean()
File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py" in full_clean
  270.         self._clean_fields()
File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py" in _clean_fields
  281.             value = field.widget.value_from_datadict(self.data, self.files, self.add_prefix(name))
File "/usr/local/lib/python2.7/dist-packages/django/forms/widgets.py" in value_from_datadict
  205.         return data.get(name, None)

Exception Type: AttributeError at /intentions/3/edit
Exception Value: 'Intention' object has no attribute 'get'
4

3 回答 3

92

你的问题在这里：

intention = Intention.objects.get(pk=id)
form = IntentionForm(intention) # An unbound form

表单的第一个参数是数据，但您正在传递实例。要正确传递实例，您应该使用：

intention = Intention.objects.get(pk=id)
form = IntentionForm(instance=intention) # An unbound form
于 2012-07-26T12:23:05.177 回答
31

上面的答案是正确的，但是，这个错误也可能是由于在用于管理模型的表单的init中错误地传递参数而产生的。

例子：

class MyForm(forms.ModelForm):
  def __init__(self, *args, **kwargs):
    super(MyForm, self).__init__(self, *args, **kwargs)

注意到 self 的双重传递了吗？它应该是：

class MyForm(forms.ModelForm):
  def __init__(self, *args, **kwargs):
    super(MyForm, self).__init__(*args, **kwargs)
于 2016-04-30T06:58:58.433 回答
6

在 Django 中，请注意如何命名视图和模型。

就我而言，我有这个models.py：

class Contact(models.Model):
    ...

在views.py中，我有：

def contact(request):
    ...

然后，在 中urls.py，我有：

from .views import Contact

所以，我实际上是在导入模型类，而不是联系人函数，所以我的错误是：

'Contact' object has no attribute 'get'

该对象没有属性get。那应该来自views.py，而不是model。

于 2017-03-21T02:28:02.303 回答