我正在尝试使用一种表单来允许用户将图像上传到存储在我的 Django 项目数据库中的项目,但是,我目前正在获取控制台输出,告诉我 formset
我'我使用的是无效的...
我试图用来将图像上传到项目的 View 定义为:
def upload_budget_pdfs(request, project_id):
project = Project.objects.get(id=project_id)
print("Value of project in 'upload_budget_pdfs()': ", project)
presentations = project.budget_versions.select_related('meeting').prefetch_related('budget_items', 'cci_items', 'presenters').filter(version_number__isnull=False).annotate(vn=F('version_number') * -1).order_by('presentation_date', 'created', '-vn')
print("Value of presentations in 'upload_budget_pdfs()': ", presentations)
drawing_formset = DrawingUploadFormset(prefix="drawings", queryset=Drawing.objects.filter(budget__in=presentations).order_by('budget__presentation_date', 'budget__created'))
print("Value of drawing_formset in 'upload_budget_pdfs()': ", drawing_formset)
if drawing_formset.is_valid():
print 'Saving drawing_formset'
print "Before", [b.id for b in project.budget_versions.all()]
for drawing_form in drawing_formset:
if drawing_form.instance.budget:
print 'Instance', drawing_form.instance.budget
drawing = drawing_form.save(commit=False)
drawing.budget = drawing_form.instance.budget
drawing.save()
print drawing, [b.id for b in project.budget_versions.all()]
else: print 'Drawing formset not valid.',drawing_formset.errors
budget_formset = BudgetPresentationFormset(request.POST, request.FILES, instance=project, prefix="presentations")
if budget_formset.is_valid() and budget_formset.has_changed():
updated_budget_presentations = budget_formset.save()
elif budget_formset.has_changed(): print 'Budget formset not valid.',budget_formset.errors
return HttpResponseRedirect(reverse('projects:concept', args=[project_id]))
调用此 View 时我得到的控制台输出是:
("Value of project in 'upload_budget_pdfs()': ", < Project: Test 1 >)
("Value of presentations in 'upload_budget_pdfs()': ", [< Budget: Test 1: Version -1 >, < Budget: Test 1: Version -1 >, < Budget: Test 1: Version 0 >, < Budget: Test 1: Version 0 >, , , , , , , , , , , , , , , , , '...(remaining elements truncated)...'])
("Value of drawing_formset in 'upload_budget_pdfs()': ", < django.forms.formsets.DrawingFormFormSet object at 0x10cee3790 >)
Drawing formset not valid. []
所以很明显,在我看来,else
语句就是这里正在运行的内容,但我不确定为什么,因为控制台清楚地表明变量都保存了正确的数据。 ..
我在这里初始化 drawing_formset
变量的方式有什么问题?我传递给 DrawingUploadFormset(...)
的 queryset
是否正确? is_valid()
实际检查什么?
编辑
我在已接受的答案中进行了更改,因此我的 drawing_formset
声明现在是:
drawing_formset = DrawingUploadFormset(request.POST, request.FILES, prefix="drawings", queryset=Drawing.objects.filter(budget__in=presentations).order_by('budget__presentation_date', 'budget__created'))
但似乎我现在收到“内部服务器错误”和 MultiValueDictKeyError
在线:
for drawing_form in drawing_formset: #This line is what's causing the MultiValueDictKeyError
我不明白这是为什么?有什么建议吗?
最佳答案
您的表单集不包含任何数据。您需要将 request.POST
和 request.FILES
作为第一个和第二个参数(或作为 data
和 files
关键字参数),但前提是它是实际的表单提交。
如果没有数据传递到表单或表单集中,它被认为是未绑定(bind)的,并且将返回 False
而不检查错误。
通常的模式是在 request.method == 'POST'
时传递它们,然后验证表单集:
def upload_budget_pdfs(request, project_id):
...
if request.method == 'POST':
drawing_formset = DrawingUploadFormset(request.POST, request.FILES, prefix='drawings', queryset=...)
if drawing_formset.is_valid():
# save formset
return HttpResponseRedirect(...)
else:
drawing_formset = DrawingUploadFormset(prefix='drawings', queryset=...)
return render(...) # Render formset
这将在 GET 上显示空白表单,在提交不成功时显示带有错误消息的已填写表单,在成功提交时它将保存表单集并重定向。
关于Django 表单集无效——为什么不呢?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41831332/