是否可以在return语句后设置变量？
我正在尝试使用if子句执行for循环。首先，如果if子句为False，则在完全执行for循环之后，它应使用表单呈现模板，然后将变量设置为True。然后再次执行for循环，但是这一次它应执行if语句并提交类似于（“确定吗？”然后单击“继续”或“取消”）的Form。我使用嵌套循环（while循环内的for循环）进行了尝试，但使用请求返回模板的return render语句之后无法再设置变量。
这是我的views.py
def file_upload(request):
if request.method == "POST":
# Wenn CSV Datei valide ist --> Datei hochladen
csv_file = request.FILES['file']
csv_file.seek(0)
decoded_file = csv_file.read().decode('utf-8').splitlines()
reader = csv.reader(decoded_file)
updated_list = list()
created_list = list()
s = False
form2 = ConfirmationForm(request.POST, request.FILES)
while (True):
for row in reader:
count += 1
try:
datet = datetime.now().date()
datum = datet.strftime("%d.%m.%Y")
row[7] = datum
row[8] = str(request.user)
#d = [row[0], row[1], row[2], row[3], row[4]]
dataset1 = CSV5.objects.filter(gebaeudebereich=row[0],
gebaeudenummer=row[1], ebene=row[2],
raum=row[3], dose=row[4])#.values_list("gebaeudebereich", "gebaeudenummer",
# "ebene", "raum", "dose")
dataset2 = CSV5.objects.filter(switch_ip=row[5], switch_port=row[6])#.values_list("switch_ip", "switch_port")
ds1 = CSV5.objects.values_list("gebaeudebereich", "gebaeudenummer", "ebene",
"raum", "dose")
ds2 = CSV5.objects.values_list("switch_ip", "switch_port")
#print("ds1: ", ds1)
print("count: ", count)
print("dataset1: ", dataset1)
print("dataset2: ", dataset2)
print("dataset1: ", dataset1.exists())
print("dataset2: ", dataset2.exists())
print("s: ", s)
if (dataset1.exists() and not dataset2.exists()):
#instance = get_object_or_404(CSV5, id=count)
print("Fall 1")
ins = CSV5.objects.filter(gebaeudebereich=row[0],
gebaeudenummer=row[1], ebene=row[2],
raum=row[3], dose=row[4])
#liste.append(ins.values_list())
#print("liste: ", liste)
print ("instance: ", ins)
if form2.is_valid() and s == True:
ins.update(switch_ip=row[5], switch_port=row[6], datum = row[7], akteur = row[8])
else:
updated_list.append(ins)
updated_obj += 1
elif not dataset1.exists() and dataset2.exists():
print("Fall 2")
ins = CSV5.objects.filter(switch_ip=row[5], switch_port=row[6])
print("instance: ", ins)
if form2.is_valid() and s == True:
ins.update(gebaeudebereich = row[0], gebaeudenummer = row[1], ebene = row[2], raum = row[3],
dose = row[4], datum = row[7], akteur = row[8])
else:
updated_list.append(ins.values_list())
print("dat2: ", dataset2)
updated_obj += 1
elif (dataset1.exists() and dataset2.exists()):
print("Fall 3")
#liste.append(dataset1)
#print("liste: ", liste)
duplicate_obj += 1
elif not (dataset1.exists() and dataset2.exists()):
print("Fall 4")
if form2.is_valid() and s == True:
ins = CSV5.objects.get_or_create(id=CSV5.objects.count() + 1, gebaeudebereich=row[0],
gebaeudenummer=row[1], ebene=row[2],
raum=row[3], dose=row[4], switch_ip=row[5], switch_port=row[6],
datum=row[7], akteur=row[8])
created_list.append(ins)
ins.save()
created_obj += 1
except IndexError:
print("IndexError")
break
except IntegrityError:
duplicate_obj += 1
print("IntegrityError")
if s != False:
messages.success(request, "objects created: %s " % created_obj)
messages.success(request, "objects updated: %s " % updated_obj)
messages.success(request, "duplicate objects: %s " % duplicate_obj)
break
elif s == False:
messages.success(request, "Einträge die neu hinzugefügt werden: %s " % created_list)
messages.success(request, "Einträge die überschrieben werden: %s " % updated_list)
messages.success(request, "Duplikate: %s " % duplicate_obj)
form = ConfirmationForm()
return render(request, "appp/confirmation.html", {'form' : form})
s = True
form = UploadFileForm()
return render(
request, "appp/file_upload.html", {"form": form}
)
这是我的确认表：
class ConfirmationForm(forms.Form):
class Meta:
model = CSV5
fields = ('gebaeudebereich', 'gebaeudenummer', 'ebene', 'raum', 'dose',
'switch_ip', 'switch_port', 'datum', 'akteur',)
confirmation.html
{% extends 'appp/base.html' %}
{% block body %}
<h2>Bestätigung</h2>
{% if user.is_authenticated %}
{% if messages %}
<ul class="messages">
{% for message in messages %}
<li{% if message.tags %} class="{{ message.tags }}"{% endif %}>{{ message }}</li>
{% endfor %}
</ul>
{% endif %}
<form method="post" enctype="multipart/form-data">
{% csrf_token %}
{{ form.as_p }}
<button type="submit" onclick="return confirm('Sollen die angezeigten Daten in der Datenbank gespeicher werden?')">Speichern</button>
</form>
<a href = "{% url 'appp:index' %}">
<button>Cancel</button>
</a>
{% endif %}
{% endblock %}
最后是我的models.py
class CSV5(models.Model):
gebaeudebereich = models.CharField(max_length=100, blank=True, null=True)
gebaeudenummer = models.CharField(max_length=100, blank=True, null=True)
ebene = models.CharField(max_length=100, blank=True, null=True)
raum = models.CharField(max_length=100, blank=True, null=True)
dose = models.CharField(max_length=100, blank=True, null=True)
switch_ip = models.CharField(max_length=100, blank=True, null=True)
switch_port = models.CharField(max_length=100, blank=True, null=True)
datum = models.CharField(max_length=100)
akteur = models.CharField(max_length=100)
class Meta:
unique_together = (("gebaeudebereich", "gebaeudenummer", "ebene", "raum", "dose"), ("switch_ip", "switch_port"))
因此，由于s为False，因此for循环遍历每个条目。它无需实际查询数据库即可进行验证。在for循环执行后，我使用ConfirmationForm在其中将要更改的数据显示给用户，然后将s设置为True。但是，由于我使用return语句，因此无法将变量设置为True。 任何帮助将不胜感激。