Django中的UpdateView显示空白表单而不是数据库以前的数据
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【中文标题】Django中的UpdateView显示空白表单而不是数据库以前的数据【英文标题】：UpdateView in Django shows blank forms instead of Database previous data 【发布时间】：2018-05-11 15:59:27 【问题描述】：我正在使用 UpdateView 通过表单来编辑数据。
在我点击编辑popup using modal 后，显示的表单带有空白数据！它不会检索数据库中以前的数据。
有人知道我应该添加什么吗？
我被这个编辑卡住了大约一个星期:(
如果有人有线索，我将不胜感激！ 谢谢！
view.py-
from django.shortcuts import render_to_response
from django.shortcuts import get_object_or_404
from django.shortcuts import render, redirect
from django.template import RequestContext
from django.views.generic import TemplateView, UpdateView, DeleteView, CreateView
from DevOpsWeb.forms import HomeForm
from DevOpsWeb.models import serverlist
from django.core.urlresolvers import reverse_lazy
from simple_search import search_filter
from django.db.models import Q
class HomeView(TemplateView):
template_name = 'serverlist.html'
def get(self, request):
form = HomeForm()
query = request.GET.get("q")
posts = serverlist.objects.all()
if query:
posts = serverlist.objects.filter(Q(ServerName__icontains=query) | Q(Owner__icontains=query) | Q(Project__icontains=query) | Q(Description__icontains=query) | Q(IP__icontains=query) | Q(ILO__icontains=query) | Q(Rack__icontains=query))
else:
posts = serverlist.objects.all()
args = 'form' : form, 'posts' : posts
return render(request, self.template_name, args)
def post(self,request):
form = HomeForm(request.POST)
posts = serverlist.objects.all()
if form.is_valid(): # Checks if validation of the forms passed
post = form.save(commit=False)
#if not form.cleaned_data['ServerName']:
#post.servername = " "
post.save()
#text = form.cleaned_data['ServerName']
form = HomeForm()
return redirect('serverlist')
args = 'form': form, 'text' : text
return render(request, self.template_name,args)
class PostDelete(DeleteView):
model = serverlist
success_url = reverse_lazy('serverlist')
class PostEdit(UpdateView):
model = serverlist
#post = serverlist.objetcs.get(server_id=server_id)
fields = ['ServerName','Owner','Project','Description','IP','ILO','Rack','Status']
success_url=reverse_lazy('serverlist')
urls.py -
from django.conf.urls import url, include
from DevOpsWeb.views import HomeView
from DevOpsWeb.views import PostDelete
from DevOpsWeb.views import PostEdit
from django.contrib import admin
admin.autodiscover()
urlpatterns = [
# Examples:
url(r'^$', HomeView.as_view(), name='serverlist'),
url(r'^admin/doc/', include('django.contrib.admindocs.urls')),
#DevOpsWeb:8000/Delete/
url(r'^delete/(?P<pk>\d+)/$', PostDelete.as_view(), name="delete_post"),
url(r'^django_popup_view_field/', include('django_popup_view_field.urls', namespace="django_popup_view_field")),
url(r'^admin/', include(admin.site.urls)),
#DevOpsWeb:8000/edit/
url(r'^edit/(?P<pk>\d+)/$', PostEdit.as_view(), name="edit_post"),
]
forms.py -
from django import forms
from DevOpsWeb.models import serverlist
class HomeForm(forms.ModelForm):
ServerName = forms.CharField(widget=forms.TextInput,max_length = 30,required=False)
Owner = forms.CharField(max_length = 50,required=False)
Project = forms.CharField(max_length = 30,required=False)
Description = forms.CharField(max_length = 255,required=False)
IP = forms.CharField(max_length = 30,required=False)
ILO = forms.CharField(max_length = 30,required=False)
Rack = forms.CharField(max_length = 30,required=False)
Status = forms.CharField(max_length = 30,required=False)
class Meta:
model = serverlist
fields = ('ServerName' ,'Owner','Project','Description','IP','ILO','Rack','Status',)
class AutoCompleteModelChoiceField(forms.ModelChoiceField):
widget = forms.TextInput
def clean(self, value):
value = super(AutoCompleteModelChoiceField, self).clean(value)
return value
class serverForm(forms.ModelForm):
hotel = AutoCompleteModelChoiceField(queryset=serverlist.objects.all())
index.html（带有编辑按钮的部分）-
<div class="modal fade bd-example-modal-sm" id="Editserver.id" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel" aria-hidden="true">
<div class="modal-dialog modal-sm">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title">Edit Server <b> server.ServerName </b> </h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<form action="% url 'edit_post' server.id %" method="post"> % csrf_token %
<!--<center> form.as_p </center> -->
% for field in form %
<div class="fieldWrapper">
field.errors
<!-- field.label_tag -->
<small><b> field.html_name <p align="left"></b> field </small> </p>
% if field.help_text %
<p class="help"> field.help_text|safe </p>
% endif %
</div>
% endfor %
</div>
<div class="wrapper">
      
<h2><button type="submit" class="save btn btn-success btn-lg">Confirm</button></h2>   
<h2><button type="submit" class="btn btn-secondary btn-lg" data-dismiss="modal">Cancel</button></h2>
</div>
</form>
</td>
</div>
</tr>
% endfor %
帖子和编辑按钮：
% for server in posts %
<tr>
<div class ="server">
<td></td>
<td><center> server.ServerName </center></td>
<td><center> server.Owner </center></td>
<td><center> server.Project </center></td>
<td><center> server.Description </center></td>
<td><center> server.IP </center></td>
<td><center> server.ILO </center></td>
<td><center> server.Rack </center></td>
<td><h4><span class="badge badge-success"> server.Status </span></h4></td></center>
<td>
    
<button type="button" class="btn btn-outline-danger" data-toggle="modal" href="#delete-server-server.id"
data-target="#Delserver.id">Delete <i class="fa fa-trash-o"></i></button> 
<button type="button" class="btn btn-outline-primary" data-toggle="modal" href="#edit-server-server.id"
data-target="#Editserver.id">   Edit  <i class="fa fa-pencil"></i></button>
 
<div id ="Delserver.id" class="modal fade" role="document">
<div class="modal-dialog" id="delete-server-server.id">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title">Delete Confirmation</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<form action="% url 'delete_post' server.id %" method="post">% csrf_token %
<h6>Are you sure you want to delete server.ServerName ?</h6>
<br>
<center><input type="submit" class="btn btn-danger btn-md" value="Confirm"/>
<button type="submit" class="btn btn-secondary" data-dismiss="modal">Cancel</button></center>
</form>
</div>
</div>
</div>
</div>
<div class="modal fade bd-example-modal-sm" id="Editserver.id" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel" aria-hidden="true">
<div class="modal-dialog modal-sm">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title">Edit Server <b> server.ServerName </b> </h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<form action="% url 'edit_post' server.id %" method="post"> % csrf_token %
<!--<center> form.as_p </center> -->
% for field in form %
<div class="fieldWrapper">
field.errors
<!-- field.label_tag -->
<small><b> field.html_name <p align="left"></b> field </small> </p>
% if field.help_text %
<p class="help"> field.help_text|safe </p>
% endif %
</div>
% endfor %
</div>
<div class="wrapper">
      
<h2><button type="submit" class="save btn btn-success btn-lg">Confirm</button></h2>   
<h2><button type="submit" class="btn btn-secondary btn-lg" data-dismiss="modal">Cancel</button></h2>
</div>
</form>
</td>
</div>
</tr>
% endfor %
</tbody>
</h5>
</table>
【问题讨论】：
不太了解你的views.py：HomeView 的班级在哪里？您的 get() 和 post() 函数不在类中...
您是否真的要在您的一般HomeView 中嵌入多个PostEdit 视图？
函数get和post在HomeView类下。我不在第二个问题下:(
【参考方案1】：
您没有使用要更新的实例来初始化表单：
form = HomeForm()
而不是当您希望使用来自对象的数据填充表单时：
form = HomeForm(instance=my_object_to_update)
由于您想为显示在HomeView 中的每个post 执行此操作，因此您需要为每个post 初始化不同的表单。在HomeView.get() 和HomeView.post() 方法中，除了创建用于创建新serverlist 的空HomeForm()：
for post in posts:
forms[post.id] = HomeForm(instance=post)
在你的模板渲染中（假设你的循环% for server in posts %）
% with server.id as id %
% with forms|get_by_key:id as edit_form %
<form action="% url 'edit_post' server.id %" method="post">
... display the form: your current code % for field in edit_form % etc...
</form>
% endwith %
% endwith %
我正在使用自定义模板过滤器|get_by_key:variable在使用变量时按键获取dict值：
@register.filter(name='get_by_key')
def get_by_key(dictionnary, key):
"""Return element in dictionnary corresponding to `key`."""
return dictionnary[key] if isinstance(dictionnary, dict) else ''
由于您有一个模板来创建新的服务器列表，而且还可以显示所有现有的服务器列表对象并更新它们，因此您需要两种表单。因此，创建上面的forms dict 是除了之外还有创建表单HomeForm()。你的上下文应该有：
args =
'form': form, # this is the serverlist creation form (empty)
'forms': forms, # these are all the forms for existing instances
'posts': posts
我也看不到你在PostEdit 中的哪个位置指定了form_class，这是UpdateView 工作所必需的。
【讨论】：
在 form_class 下我写了： form_class= HomeForm 并且：对于帖子中的帖子：我需要在 post 函数中还是在 PostEdit 类中编写它？而模板渲染我应该把它写在serverlist.html中的modal中？ 有两个form = HomeForm()..一个在第一行post下面一个在if form_is_valid()我应该改哪一个并放for循环？ 我应该在我的模板中哪里添加这些行？因为现在它只显示第一个表单的数据 % with post.id as id % % with forms.id as form % do something with form % endwith % % endwith % 我假设你在某处循环你的posts：% for post in posts % ... code to display your post and its edit form ... here you add the template code I mentioned ... % endfor %
我在最后的主要问题的表格中添加了我在 html 中循环的帖子的短代码...你能在答案中准确地编辑我应该添加 html 代码的位置吗？表格编号？还有什么是“做某事？”做什么？我只需要传递表单 id no？以上是关于Django中的UpdateView显示空白表单而不是数据库以前的数据的主要内容，如果未能解决你的问题，请参考以下文章
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