django 将绑定的表单字段值作为关键字参数结果传递给 url 无

Question

我有一个表单来编辑现有的一组模型。为了发布表单，我试图将操作定向到带有关键字参数的 url，作为绑定表单中“id”字段的值。但是我收到以下错误：

NoReverseMatch at /membership/edit/12
Reverse for 'members_edit' with arguments '()' and keyword arguments '{u'id': None}' not       found. 1 pattern(s) tried: ['membership/edit/(?P<id>\\d{1,5})$']

这是我的表单的相关 html：

  <form class="form-horizontal" role="form" action="{% url 'members_edit' id=edit_member_form.member_id.value %}" method="post"> {% csrf_token %}
    <div class="row">
      <!-- Static ID number -->
      <div class="col-md-4 col-md-offset-4 form-control-static text-big">
        <p><strong>ID #:</strong> &nbsp{{edit_member_form.member_id.value}}</p>
      </div>
    </div>
  </form>  

我知道表单中的值不是 None，因为当我在提交 POST 之前显示绑定表单时，包含 {{edit_member_form.member_id.value}} 的行计算为整数（例如，12）并正确显示。

我是django的新手，但是为什么edit_member_form.member_id.value在url标签中计算为None，但在显示时计算为绑定到表单的数字？

如果有更好的技术来获得相同的预期效果，我会很高兴听到它。真的，我只是想将表单发布回显示它的相同网址，并且关键字完好无损。

提前感谢您的任何帮助或建议。

编辑：

def members_edit(request, id="1"):
context = { 'active':'members' }
context['filter_list'] = Member.objects.all().order_by('last_name')
id=int(id)
print 'callec'
# if form was submitted
if (request.method == 'POST'):
    edit_member_form = EditMemberForm(request.POST)
    if edit_member_form.is_valid(): #all validation rules pass
        print 'called'
        edit_member_and_pass( edit_member_form.cleaned_data )
        member_id = edit_member_form.cleaned_data['member_id']
        return redirect('members_view', id=member_id)
    else:
        context['edit_member_form'] = edit_member_form
        #return render(request, 'members/members_edit.html', context)
# else display an initial form
else:
    member_set = Member.objects.filter(pk=id)
    # if we find the member
    if ( len(member_set) == 1):
        member = member_set[0]
        member_dict = { k:v for k,v in member.__dict__.items() if k not in ['_state', 'photo']}
        member_dict['member_id'] = id
        # get only their passes for this season, that haven't been flagged lost/stolen
        pass_set = member.pass_set.filter(season=get_current_season(), lost_stolen=False)
        # if the member has one current season pass associated with him
        if ( len(pass_set) == 1):
            member_pass = pass_set[0]
            member_dict['member_type'] = member_pass.member_type
            member_dict['active_id'] = member_pass.active_id
            edit_member_form = EditMemberForm( member_dict)
            context['edit_member_form'] = edit_member_form
            #return render(request, 'members/members_edit.html', context)
        # make sure they don't have too many for some crazy reason
        elif ( len(pass_set) > 1 ):
            context['pass_error'] = True
            context['pass_error_msg'] = 'Error: Member has too many active passes for this season.\nPlease have a director edit this record directly.'
            #return render(request, 'members/members_edit.html', context)
        # else the member hasn't been enrolled yet for this season
        # so we want to reenroll them
        else:
            edit_member_form = EditMemberForm( member_dict )
            context['edit_member_form'] = edit_member_form
            #return render(request, 'members/members_edit.html', context)
    # if for some crazy reason there are multiple members with this id    
    elif ( len(member_set) >1):
        context['member_error'] = True
        context['member_error_msg'] = 'Error: Multiple members with id ' + str(id) +'\nPlease have a director edit these records directly'
        #return render(request, 'members/members_edit.html', context)
    # else the member doesn't exist
    else:
        context['member_error'] = True
        context['member_error_msg'] = "Error: Member doesn't exist.\nPlease sign them up as new"
        #return render(request, 'members/members_edit.html', context)
return render(request, 'members/members_edit.html', context)

编辑 2： 问题似乎是edit_member_form.member_id 的值在提交时未绑定到表单字段。我不确定为什么会发生这种情况。

如果我显示字段本身，则表单提交成功。 即，

<p><strong>ID #:</strong> &nbsp{{edit_member_form.member_id}}</p>

有效但

<p><strong>ID #:</strong> &nbsp{{edit_member_form.member_id.value}}</p>

没有。

如何显示字段值，而不是可编辑，但使值保持绑定到表单？

编辑 3： 这是我urls.py的相关代码

urlpatterns = patterns('members.views',
    url(r'^membership/view/(?P<id>\d{1,5})$', 'members_view', name='members_view'),  # view members page
    url(r'^membership/edit/(?P<id>\d{1,5})$', 'members_edit', name='members_edit'),  # edit members page

另外，在我自己解决问题的尝试中，我相信如果我可以编写标记以便显示值，并且在提交时发布该值，它就可以解决。我认为问题在于

<p><strong>ID #:</strong> &nbsp{{edit_member_form.member_id}}</p>

评估为标记中的<input> 字段，该字段在提交表单时发布。由于仅显示值不会评估为包含此输入标签，因此不会将值发布到请求中。所以现在的问题变成了如何在没有<input> 字段的情况下将数据发布到表单提交的请求中？我是否应该干预一些更老套的东西，比如 jQuery？

解决方案 最后，解决方案是在包含要提交的值的字段中添加隐藏输入。在显示该字段后，它基本上只增加了这一行

<p class="form-control-static" id="id_member_id">{{edit_member_form.member_id.value}}</p>
<input type="hidden" id="id_member_id" name="member_id" value="{{edit_member_form.member_id.value}}">

Answer 1

我相信这可能就像从表单中删除“action”属性一样简单。如果您这样做，表单将回发给自己；即，/membership/edit/12/ 上的表单将发布到 /membership/edit/12/。

这将消除您在页面上以任何形式打印 id 的任何需要。