python-3.x - 如何在 Django 上使用 modelformset_factory 进行更新
问题描述
我使用 modelformset_factory 方法上传多张照片。但是当我想更新帖子时,我不知道该怎么做,我尝试了一些方法,但这只是为了重新上传照片并再次上传上传的照片。如何更新或删除之前上传的照片?此外,我无法以 {{formset.image}} 的形式访问表单集中的照片。我怎样才能访问这个?
视图.py
def post_update(request, slug):
post = get_object_or_404(Post, slug=slug)
if not request.user.is_authenticated and not request.user == post.seller or not request.user.is_admin:
raise Http404
ImageFormSet = modelformset_factory(PostImage, form=PostImageForm, extra=5, can_delete = True)
form = PostForm(data=request.POST or None, instance = post, files = request.FILES or None)
formset = ImageFormSet(data=request.POST or None, files= request.FILES or None, queryset=PostImage.objects.filter(post__slug=slug))
if form.is_valid():
if formset.is_valid():
for forms in formset.cleaned_data:
if forms:
image = forms['image']
print(forms['image'])
photo = PostImage(post=post, image=image)
photo.save()
form.save(commit=True)
messages.success(request,"Success")
return HttpResponseRedirect(reverse('gayrimenkul:detail',kwargs={'slug':form.instance.slug}))
return render(request,'post_update.html',{'form':form,'formset':formset,'slug':slug})
post_update.html
{% extends "main_page.html" %}
{% load static %}
{% block icerik %}
{% load crispy_forms_tags %}
<div class="row">
<div class="container">
<h2 class="page_header">İlan Ver</h2>
<hr>
{% if form.errors %}
{{form.errors}}
{% endif %}
<div class="col-md-12">
<form enctype="multipart/form-data" method="POST">
{% csrf_token %}
{{form.media}}
{{form|crispy}}
<div class="row">
<div class="col-md-6">
{{formset}}
</div>
<div class="col-md-6">
<button type="submit" id="inp" class="btn btn-outline-primary" style="float:right;">Kaydet</button>
</div>
</div>
</form>
</div>
</div>
</div>
{% endblock %}
创建帖子成功。
def post_create(request):
if not request.user.is_authenticated:
raise Http404
ImageFormSet = modelformset_factory(PostImage, form=PostImageForm, extra=5)
if request.method == 'POST':
post_form = PostForm(request.POST, request.FILES)
formset = ImageFormSet(request.POST, request.FILES, queryset=PostImage.objects.none())
if post_form.is_valid():
created_post = post_form.save(commit=False)
created_post.seller = request.user
created_post.save()
for form in formset.cleaned_data:
if form:
image = form['image']
photo = PostImage(post=created_post, image=image)
photo.save()
messages.success(request,'Success')
return HttpResponseRedirect(reverse('gayrimenkul:detail',kwargs={'slug':created_post.get_slug()}))
else:
post_form = PostForm()
formset = ImageFormSet(queryset = PostImage.objects.none())
return render(request,'post_create.html',{'form':post_form,'formset':formset})
解决方案
在检查表单是否有效之前,只需过滤表单集的模型
data = PostImage.objects.filter(post=post)
为从 0 开始的表单集项目和 (f) 项目本身提供项目的索引,如果 id 的项目没有更改,则保存前一个项目本身,否则使用您更新的新图像更改数据库图像。
if formset.is_valid():
for index, f in enumerate(formset):
if f.cleaned_data:
if f.cleaned_data['id'] is None:
pic = PostImage(post=post, image=f.cleaned_data.get('image'))
pic.save()
elif f.cleaned.data['image'] is False:
pic = PostImage.objects.get(id = request.POST.get('form-' + str(index) + '-id'))
pic.delete()
else:
pic = PostImage(post=post, image=f.cleaned_data.get('image'))
d = PostImage.objects.get(id=data[index].id) #get slide id which was uploaded
d.image = pic.image # changing the database title with new title
d.save()
这可能对您有用或让您有所了解。
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