我想我会问一个广泛的问题，这样我就可以更好地了解 Django，并且可以更轻松地处理我可能遇到的任何类似问题。我遇到的具体问题是我已经编写了我的第一个表单集代码，它可以正确呈现表单，但发布时不会创建新对象。
我可以从服务器看到表单已经发布，我没有收到任何错误，但没有数据添加到我的数据库中（从 django admin 和 manage.py shell 检查）。也许可以阅读在 manage.py shell 中发布的内容？我希望能够检查表单是否正确发布了其数据并且视图是否已接收到它。然后我可以看到为什么数据没有正确发布或者视图没有正确处理它。
对于特定问题，我将把我的代码放在下面，以防这是一个简单的初学者错误，你们中的一个向导可以发现。我尝试按照自己的目的遵循和调整本教程。
模型.py
class Chunk(models.Model):
name = models.CharField(max_length=250)
text = models.CharField(max_length=500)
images = models.FileField()
question = models.CharField(max_length=250)
expected_completion_time = models.IntegerField(default=1)
keywords = models.CharField(max_length=250, blank=True, null=True)
topic = models.CharField(max_length=250, blank=True, null=True)
course = models.CharField(max_length=250, blank=True, null=True)
is_flagged = models.BooleanField(default=False)
def get_absolute_url(self):
return reverse('detail', kwargs={'pk':self.pk})
def __str__(self):
return self.name
class Concept(Chunk):
application = models.CharField(max_length=500)
@property
def mode(self):
return "concept"
class Subconcepts(models.Model):
subconcept = models.CharField(max_length=500)
concept = models.ForeignKey(Concept, on_delete=models.CASCADE)
def __str__(self):
return self.concept.name + ' - Subconcept'
表格.py
class ConceptForm(forms.ModelForm):
# Form for creating Concept objects
class Meta:
model = Concept
fields = ['application', 'name', 'text', 'images', 'question', 'expected_completion_time', 'keywords', 'topic', 'course']
class SubconceptForm(forms.ModelForm):
# Form for creating Subconcept objects which are linked by ManyToOne fields to Concept objects
class Meta:
model = Subconcepts
fields = ['subconcept'] # Concept field excluded as will be set in view on form submission
class BaseSubconceptFormset(BaseFormSet):
def clean(self):
# Validate that all subconcepts are unique
if any(self.errors):
return
subconcepts = []
duplicates = False
for form in self.forms:
if form.cleaned_data:
subconcept = form.cleaned_data('subconcept')
if subconcept:
if subconcept in subconcepts:
duplicates = True
subconcepts.append(subconcept)
if duplicates:
raise forms.ValidationError(
'Each key feature must be unique',
code='duplicate_subconcept'
)
视图.py
def testformsets(request):
# Forms for creating a concept with appropriate subconcepts
SubconceptFormset = formset_factory(SubconceptForm, formset=BaseSubconceptFormset)
if request.method == 'POST':
concept_form = ConceptForm(request.POST)
subconcept_formset = SubconceptFormset(request.POST)
if concept_form.is_valid() and subconcept_formset.is_valid():
concept = concept_form.save()
new_subconcepts = []
for subconcept_form in subconcept_formset:
subconcept = subconcept_form.cleaned_data.get('subconcept')
new_subconcepts.append(Subconcepts(subconcept=subconcept, concept=concept))
try:
with transaction.atomic():
# Add all new subconcepts at once
Subconcepts.objects.bulk_create(new_subconcepts)
# And notify our users that it worked
messages.success(request, 'You have added new material')
except IntegrityError: # If the transaction failed
messages.error(request, 'There was an error saving your concept.')
return redirect('pomodoro/index.html')
else:
concept_form = ConceptForm()
subconcept_formset = SubconceptFormset()
context = {
'concept_form': concept_form,
'subconcept_formset': subconcept_formset
}
return render(request, 'pomodoro/formset_test.html', context)