我的UpdateView确实显示了飞行orm中的错误

Question

我有一个更新视图，它显示一个表单(基于某些条件(。我可以成功地更新我的模型，但如果我输入了错误的数据(比如错误的时间字段(，我不会返回任何错误，我只会刷新更新表单。我的观点是这样的：

class Cd_MixedView(UpdateView):
model = Track
template_name = 'cd_mixed_view.html'
form_class = TrackForm
context_object_name = 'cd_edit'
def get_context_data(self, **kwargs):
context = super(Cd_MixedView,self).get_context_data(**kwargs)
cur_track = Track.objects.get(id=self.kwargs['pk'])
context['form'] = TrackForm(instance=cur_track)
context['cd_info'] = Cd.objects.get(id=cur_track.cd_id.pk)
return context
def post(self, request, *args, **kwargs):
self.object = self.get_object()
form = self.get_form()
if form.is_valid():
return self.form_valid(form)
else:
return self.form_invalid(form)
def form_valid(self,form):
form.save()
return super(Cd_MixedView, self).form_valid(form)
def form_invalid(self,form):
print("Form Invalid")
return super(Cd_MixedView,self).form_invalid(form)

我的模板如下：

<!-- templates/cd_mixed_view.html -->
{% extends 'base.html' %}
{% load static %}
{% block title %} CD Details{% endblock title %}
{% block content %}
<h1>CD Update Track </h1>
{% if cd_info %}
<p>Artist Name:&nbsp;{{ cd_info.artist_name}}
<p>Cd Title:&nbsp;{{ cd_info.cd_title }}
<p>Cd Total Time:&nbsp;{{ cd_info.cd_total_time|time:"H:i:s" }}
<p>Cd Run Time:&nbsp;{{ cd_info.cd_run_time|time:"H:i:s" }}
<p>Cd Remaining Time:&nbsp;
{% if cd_info.cd_run_time_delta > cd_info.cd_total_time_delta %}
(-{{ cd_info.cd_remaining_time|time:"H:i:s" }})
{% else %}
{{ cd_info.cd_remaining_time|time:"H:i:s" }}
{% endif %}
<TABLE BORDER="0" TABLE_LAYOUT="fixed" WIDTH="100%">
<TR BGCOLOR="#B0B0FF">
<TD ALIGN="Center">&nbsp;Track #</TD>
<TD ALIGN="Center"> Cut Title</TD>
<TD ALIGN="Center">Track Length</TD>
<TD ALIGN="Center" BGCOLOR="#CC99CC">Run Time</TD>
<TD ALIGN="Center" BGCOLOR="#CC99CC">Time Remaining</TD>
</TR>
{% for tracks in cd_info.cd_tracks.all %}
{% if tracks.id != cd_edit.pk %}
<TR>
<TD ALIGN="Left" VALIGN="Top" WIDTH="10">&nbsp;{{ tracks.track_number }}</TD>
<TD ALIGN="Left" VALIGN="Top">&nbsp;{{ tracks.track_title }}</TD>
<TD ALIGN="Left" VALIGN="Top">{{ tracks.trk_length_time|time:"H:i:s" }}</TD>
<TD ALIGN="Left" VALIGN="Top">{{ tracks.trk_run_time|time:"H:i:s" }}</TD>
{% if tracks.trk_run_time_delta > cd_info.cd_total_time_delta %}
<TD BGCOLOR="#8DF1BF" ALIGN="Left">&nbsp;(-{{ tracks.trk_remaining_time|time:"H:i:s" }})</TD>
{% else %}
<TD BGCOLOR="#8DF1BF" ALIGN="Left">&nbsp;{{ tracks.trk_remaining_time|time:"H:i:s" }}</TD>
{% endif %}
</TR>
{% else %}
<form action="" method="post">
{% csrf_token %}
{{ form }}
<tr>
<td>&nbsp;</td>
<td><input type="submit" value="Update Track Values"></td>
</tr>
</form>
{% if form.errors %}
<p>There were some errors in the information you entered. Please correct the following:</p>
<ul>
{% for field in form %}
{% if field.errors %}
<li>{{ field.label }}:
{{ field.errors|striptags }}</li>
{% endif %}
{% endfor %}
</ul>
{% endif %}
{% endif %}
{% endfor %}
</TABLE>
{% endif %}
{% endblock content %}

表单本身如下：

class TrackForm(forms.ModelForm):
class Meta:
model = Track
exclude = ('trk_length_time_delta',
'trk_run_time',
'trk_run_time_delta'   ,
'trk_remaining_time',
'trk_remaining_time_delta',
)
widgets = {
'cd_id': forms.HiddenInput()
}

我甚至在invalid_form函数中放了一个print，所以它似乎知道表单是无效的，但它只是用以前的数据重新显示我的表单。

你知道我在这里缺少什么吗？

感谢

Answer 1

您使用UpdateView，但由于某些原因，您去重新定义它的大多数有用方法，而甚至没有进行任何有用或新的更改。主要问题是在手动定义表单时覆盖get_context_data并覆盖表单，即使超级方法已经将表单正确添加到上下文中。

让UpdateView完成它的工作——你写的大部分代码都不需要，因为UpdateView已经完成了：

class Cd_MixedView(UpdateView):
model = Track
template_name = 'cd_mixed_view.html'
form_class = TrackForm
context_object_name = 'cd_edit'

def get_context_data(self, **kwargs):
context = super(Cd_MixedView,self).get_context_data(**kwargs)
cur_track = self.object # no need to get the object again it is already present in `self.object`
# form is already added to context by super method
context['cd_info'] = Cd.objects.get(id=cur_track.cd_id.pk)
return context
# `post`, `form_valid` and `form_invalid` methods were same as super so no need to write yourself