仅在 django 中创建基于更新 class 的视图时，将表单集用于我的文件上传不起作用
Using formsets for my fileupload does not work when doing an update class based view only on create in django
我在网上使用了尽可能多的示例，试图让我的两个简单模型能够执行内联表单集，从而允许我将许多文件添加到技术绘图中。
这是行不通的，我只能为创建添加一个文件，而更新只能更新 Technical_Entry 模型，而不是文件……这本身就很有趣。 UI ona create 显示一个地方添加一个文件，然后保存整个记录和它的子记录。这样可行。
更新后，UI 显示了之前保存的文件..（太棒了！）但随后又多了两个 'choose file' 插槽（随机的？）并在单击保存时将文件添加到这些插槽中什么都不做.它不会删除先前在创建中添加的文件，但它也会
不保存添加到现在三个插槽中的新文件（一个已用，两个可用）。因此出于某种原因更新对文件不起作用。
class Technical_Entry(models.Model):
category = models.ForeignKey(Category, on_delete=models.CASCADE)
ema = models.ForeignKey(EMA, on_delete=models.CASCADE)
system = models.ForeignKey('System', on_delete=models.CASCADE) # are SYSTEMS RELATED TO SUBSYSTEMS OR JUST TWO GROUPS?
sub_system = models.ForeignKey(SubSystem, on_delete=models.CASCADE)
drawing_number = models.CharField(max_length=200)
drawing_title = models.CharField(max_length=255)
engineer = models.CharField(max_length=200)
vendor = models.ForeignKey(Vendor, on_delete=models.CASCADE)
date_drawn = models.DateField()
ab = models.BooleanField()
class Technical_Entry_Files(models.Model):
tech_entry = models.ForeignKey(Technical_Entry, on_delete=models.CASCADE)
file = models.FileField(upload_to='techdb/files/')
def __str__(self):
return self.tech_entry.drawing_number
使用表单集上传。虽然页面 'displays' 大部分是正确的，但它并没有在 Technical_Entry_Files 模型中创建记录。
相关forms.py:
class FileUploadForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
super(FileUploadForm, self).__init__(*args, **kwargs)
self.helper = FormHelper()
self.helper.form_class = 'form-horizontal'
self.helper.label_class = 'col-lg-4'
self.helper.field_class = 'col-lg-8'
class Meta:
model = Technical_Entry_Files
fields = ('file',)
TechFileFormSet = inlineformset_factory(Technical_Entry, Technical_Entry_Files, form=FileUploadForm, extra=1, max_num=15)
class Technical_EntryForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
super(Technical_EntryForm, self).__init__(*args, **kwargs)
self.helper = FormHelper()
self.helper.form_class = 'form-horizontal'
self.helper.label_class = 'col-lg-4'
self.helper.field_class = 'col-lg-8'
self.helper.add_input(Submit('submit', 'Submit'))
class Meta:
model = Technical_Entry
fields = ('category', 'ema', 'system', 'sub_system', 'drawing_number', 'drawing_title', 'engineer', 'vendor', 'date_drawn', 'ab')
widgets = {
'date_drawn':DateInput(attrs={
'class':'datepicker form-control',
'id' : 'datetimepicker2',
'tabindex' : '1',
'placeholder' : 'MM/DD/YYYY hh:mm',
'autocomplete':'off',
}, format='%m/%d/%Y'),
'system' : Select(attrs={'tabindex':'2'}),
}
相关views.py:
class TechEntryCreateView(LoginRequiredMixin, CreateView):
print ("we are here")
model = Technical_Entry
form_class = Technical_EntryForm
template_name = 'techdb/tech_entry_form.html'
print(template_name)
success_url = '/techentry_add'
def get_context_data(self, **kwargs):
data = super(TechEntryCreateView, self).get_context_data(**kwargs)
if self.request.POST:
data['file_upload'] = TechFileFormSet(self.request.POST, self.request.FILES)
else:
data['file_upload'] = TechFileFormSet()
return data
def form_valid(self, form):
context =self.get_context_data()
file_upload = context['file_upload']
with transaction.atomic():
self.object = form.save()
if file_upload.is_valid():
file_upload.instance =self.object
file_upload.save()
return super(TechEntryCreateView, self).form_valid(form)
class TechEntryUpdateView(LoginRequiredMixin, UpdateView):
model = Technical_Entry
form_class = Technical_EntryForm
template_name = 'techdb/tech_entry_form.html'
success_url = '/'
def get_context_data(self, **kwargs):
context = super(TechEntryUpdateView, self).get_context_data(**kwargs)
if self.request.POST:
context["file_upload"] = TechFileFormSet(self.request.POST, self.request.FILES,instance=self.object)
else:
context["file_upload"] = TechFileFormSet(instance=self.object)
return context
def form_valid(self, form):
context = self.get_context_data()
file_upload = context["file_upload"]
self.object = form.save()
if file_upload.is_valid():
file_upload.instance =self.object
file_upload.save()
return super(TechEntryUpdateView, self).form_valid(form)
和 tech_entry_form.html:
{% extends 'base.html' %}
{% load static %}
{% block page-js %}
<script>
$('.link-formset').formset({
addText: 'add file',
deleteText: 'remove',
});
</script>
{% endblock %}
{% block content %}
<main role="main" class="container">
<div class="starter-template">
<h1>New Tech Entry</h1>
</div>
<h2> Details of Technical Entry </h2>
<div class="row">
<div class="col-sm">
<form action="" method="post" enctype="multipart/form-data">{% csrf_token %}
{{ form.as_p }}
<h2> Files </h2>
{{ file_upload.management_form }}
{% for upload_form in file_upload.forms %}
<div class="link-formset">
{{ upload_form.file }}
</div>
{% endfor %}
<input type="submit" value="Save"/><a href="{% url 'tech_database:index' %}">back to the list</a>
</form>
</div>
</div>
</div>
</main><!-- /.container -->
{% endblock %}
编辑时 UI 的样子...
class TechEntryUpdateView(LoginRequiredMixin, UpdateView):
model = Technical_Entry
form_class = Technical_EntryForm
template_name = 'techdb/tech_entry_form.html'
success_url = '/'
#log_entry_class = Technical_EntryForm(Technical_Entry) #removed
def get_context_data(self, **kwargs):
context = super(TechEntryUpdateView, self).get_context_data(**kwargs)
#self.object = self.get_object() #removed
if self.request.POST:
context["file_upload"] = TechFileFormSet(self.request.POST, self.request.FILES,instance=self.object)
else:
context["file_upload"] = TechFileFormSet(instance=self.object)
return context
def form_valid(self, form):
context = self.get_context_data()
file_upload = context["file_upload"]
self.object = form.save()
if file_upload.is_valid():
file_upload.instance =self.object
file_upload.save()
#return super().form_valid(form)
return super(TechEntryUpdateView, self).form_valid(form) #replaced old one
更新
1.为了创建时可以添加多个文件,
TechFileFormSet = inlineformset_factory(Technical_Entry, Technical_Entry_Files, form=FileUploadForm, extra=4, max_num=4)
# note I changed to extra=4, if you always want to have only 4 files, then also change to max_num=4
2. update的时候，修改views后更新还是不行是因为你没有通过 hidden fields。您没有传递文件的 id，因此，您的表单集没有传递 .is_valid()，因此没有更新。添加关于隐藏字段的循环，如下所示。
{{ file_upload.management_form }}
{% for upload_form in file_upload.forms %}
{% for hidden in upload_form.hidden_fields %}
{{hidden}}
{% endfor %}
<div class="link-formset">
{{ upload_form.file }}
</div>
{% endfor %}
#注意我加的for loop关于hidden fields。
我在网上使用了尽可能多的示例，试图让我的两个简单模型能够执行内联表单集，从而允许我将许多文件添加到技术绘图中。 这是行不通的，我只能为创建添加一个文件，而更新只能更新 Technical_Entry 模型，而不是文件……这本身就很有趣。 UI ona create 显示一个地方添加一个文件，然后保存整个记录和它的子记录。这样可行。 更新后，UI 显示了之前保存的文件..（太棒了！）但随后又多了两个 'choose file' 插槽（随机的？）并在单击保存时将文件添加到这些插槽中什么都不做.它不会删除先前在创建中添加的文件，但它也会 不保存添加到现在三个插槽中的新文件（一个已用，两个可用）。因此出于某种原因更新对文件不起作用。
class Technical_Entry(models.Model):
category = models.ForeignKey(Category, on_delete=models.CASCADE)
ema = models.ForeignKey(EMA, on_delete=models.CASCADE)
system = models.ForeignKey('System', on_delete=models.CASCADE) # are SYSTEMS RELATED TO SUBSYSTEMS OR JUST TWO GROUPS?
sub_system = models.ForeignKey(SubSystem, on_delete=models.CASCADE)
drawing_number = models.CharField(max_length=200)
drawing_title = models.CharField(max_length=255)
engineer = models.CharField(max_length=200)
vendor = models.ForeignKey(Vendor, on_delete=models.CASCADE)
date_drawn = models.DateField()
ab = models.BooleanField()
class Technical_Entry_Files(models.Model):
tech_entry = models.ForeignKey(Technical_Entry, on_delete=models.CASCADE)
file = models.FileField(upload_to='techdb/files/')
def __str__(self):
return self.tech_entry.drawing_number
使用表单集上传。虽然页面 'displays' 大部分是正确的，但它并没有在 Technical_Entry_Files 模型中创建记录。
相关forms.py:
class FileUploadForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
super(FileUploadForm, self).__init__(*args, **kwargs)
self.helper = FormHelper()
self.helper.form_class = 'form-horizontal'
self.helper.label_class = 'col-lg-4'
self.helper.field_class = 'col-lg-8'
class Meta:
model = Technical_Entry_Files
fields = ('file',)
TechFileFormSet = inlineformset_factory(Technical_Entry, Technical_Entry_Files, form=FileUploadForm, extra=1, max_num=15)
class Technical_EntryForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
super(Technical_EntryForm, self).__init__(*args, **kwargs)
self.helper = FormHelper()
self.helper.form_class = 'form-horizontal'
self.helper.label_class = 'col-lg-4'
self.helper.field_class = 'col-lg-8'
self.helper.add_input(Submit('submit', 'Submit'))
class Meta:
model = Technical_Entry
fields = ('category', 'ema', 'system', 'sub_system', 'drawing_number', 'drawing_title', 'engineer', 'vendor', 'date_drawn', 'ab')
widgets = {
'date_drawn':DateInput(attrs={
'class':'datepicker form-control',
'id' : 'datetimepicker2',
'tabindex' : '1',
'placeholder' : 'MM/DD/YYYY hh:mm',
'autocomplete':'off',
}, format='%m/%d/%Y'),
'system' : Select(attrs={'tabindex':'2'}),
}
相关views.py:
class TechEntryCreateView(LoginRequiredMixin, CreateView):
print ("we are here")
model = Technical_Entry
form_class = Technical_EntryForm
template_name = 'techdb/tech_entry_form.html'
print(template_name)
success_url = '/techentry_add'
def get_context_data(self, **kwargs):
data = super(TechEntryCreateView, self).get_context_data(**kwargs)
if self.request.POST:
data['file_upload'] = TechFileFormSet(self.request.POST, self.request.FILES)
else:
data['file_upload'] = TechFileFormSet()
return data
def form_valid(self, form):
context =self.get_context_data()
file_upload = context['file_upload']
with transaction.atomic():
self.object = form.save()
if file_upload.is_valid():
file_upload.instance =self.object
file_upload.save()
return super(TechEntryCreateView, self).form_valid(form)
class TechEntryUpdateView(LoginRequiredMixin, UpdateView):
model = Technical_Entry
form_class = Technical_EntryForm
template_name = 'techdb/tech_entry_form.html'
success_url = '/'
def get_context_data(self, **kwargs):
context = super(TechEntryUpdateView, self).get_context_data(**kwargs)
if self.request.POST:
context["file_upload"] = TechFileFormSet(self.request.POST, self.request.FILES,instance=self.object)
else:
context["file_upload"] = TechFileFormSet(instance=self.object)
return context
def form_valid(self, form):
context = self.get_context_data()
file_upload = context["file_upload"]
self.object = form.save()
if file_upload.is_valid():
file_upload.instance =self.object
file_upload.save()
return super(TechEntryUpdateView, self).form_valid(form)
和 tech_entry_form.html:
{% extends 'base.html' %}
{% load static %}
{% block page-js %}
<script>
$('.link-formset').formset({
addText: 'add file',
deleteText: 'remove',
});
</script>
{% endblock %}
{% block content %}
<main role="main" class="container">
<div class="starter-template">
<h1>New Tech Entry</h1>
</div>
<h2> Details of Technical Entry </h2>
<div class="row">
<div class="col-sm">
<form action="" method="post" enctype="multipart/form-data">{% csrf_token %}
{{ form.as_p }}
<h2> Files </h2>
{{ file_upload.management_form }}
{% for upload_form in file_upload.forms %}
<div class="link-formset">
{{ upload_form.file }}
</div>
{% endfor %}
<input type="submit" value="Save"/><a href="{% url 'tech_database:index' %}">back to the list</a>
</form>
</div>
</div>
</div>
</main><!-- /.container -->
{% endblock %}
编辑时 UI 的样子...
class TechEntryUpdateView(LoginRequiredMixin, UpdateView):
model = Technical_Entry
form_class = Technical_EntryForm
template_name = 'techdb/tech_entry_form.html'
success_url = '/'
#log_entry_class = Technical_EntryForm(Technical_Entry) #removed
def get_context_data(self, **kwargs):
context = super(TechEntryUpdateView, self).get_context_data(**kwargs)
#self.object = self.get_object() #removed
if self.request.POST:
context["file_upload"] = TechFileFormSet(self.request.POST, self.request.FILES,instance=self.object)
else:
context["file_upload"] = TechFileFormSet(instance=self.object)
return context
def form_valid(self, form):
context = self.get_context_data()
file_upload = context["file_upload"]
self.object = form.save()
if file_upload.is_valid():
file_upload.instance =self.object
file_upload.save()
#return super().form_valid(form)
return super(TechEntryUpdateView, self).form_valid(form) #replaced old one
更新 1.为了创建时可以添加多个文件,
TechFileFormSet = inlineformset_factory(Technical_Entry, Technical_Entry_Files, form=FileUploadForm, extra=4, max_num=4)
# note I changed to extra=4, if you always want to have only 4 files, then also change to max_num=4
2. update的时候，修改views后更新还是不行是因为你没有通过 hidden fields。您没有传递文件的 id，因此，您的表单集没有传递 .is_valid()，因此没有更新。添加关于隐藏字段的循环，如下所示。
{{ file_upload.management_form }}
{% for upload_form in file_upload.forms %}
{% for hidden in upload_form.hidden_fields %}
{{hidden}}
{% endfor %}
<div class="link-formset">
{{ upload_form.file }}
</div>
{% endfor %}
#注意我加的for loop关于hidden fields。