[英]Unique=True in Django model gives IntergretyError instead of ValidationError
我想在HTML表單中顯示一條驗證消息,例如“此電子郵件已在使用中”。
但我認為我缺少了一些東西。 我在電子郵件字段中不斷收到IntegrityError。 如果我在模型中使用unique = True,Django是否不應該對此進行驗證並給出ValidationError? 還是我必須自己嘗試並捕獲IntegrityError?
或向我展示驗證表單/模型內唯一用戶的最佳實踐。
models.py
class Customer(models.Model):
FirstName = models.CharField(max_length=50)
LastName = models.CharField(max_length=50)
Email = models.CharField(max_length=50, unique=True, error_messages={'unique':"This email is already in use"})
views.py
def customerform(request):
if request.method == 'POST':
form = CustomerForm(request.POST)
if form.is_valid():
post = Customer()
post.FirstName = form.cleaned_data['FirstName']
post.LastName = form.cleaned_data['LastName']
post.Email = form.cleaned_data['Email']
post.save()
return render(request, 'results.html', {
'FirstName': form.cleaned_data['FirstName'],
'Email': form.cleaned_data['Email'],})
else:
form = CustomerForm()
return render(request, 'form.html', {'form':form})
表格
class CustomerForm(forms.Form):
FirstName = forms.CharField (label='First name:', max_length=50)
LastName = forms.CharField (label='Last name:', max_length=50)
Email = forms.EmailField(label='Email:', max_length=50)
form.html
<form action="/customer/" method="post">
{% csrf_token %}
{{ form }}
<input type="submit" value="Submit">
</form>
如果您希望表單驗證自動使用模型屬性,則必須使用ModelForm
:
class CustomerForm(forms.ModelForm):
class Meta:
model = Customer
fields = ["FirstName", "LastName", "Email"]
如果要使用常規Form
,則需要手動進行驗證。
def customerform(request):
if request.method == 'POST':
form = CustomerForm(request.POST)
if form.is_valid():
# first we check if email is valid
customer = Customer.objects.filter(Email = form.cleaned_data['Email'])
if customer.count() == 0: # email not in use
post = Customer()
post.FirstName = form.cleaned_data['FirstName']
post.LastName = form.cleaned_data['LastName']
post.Email = form.cleaned_data['Email']
post.save()
return render(request, 'results.html', {
'FirstName': form.cleaned_data['FirstName'],
'Email': form.cleaned_data['Email'],})
else: # email in use so we redirect to html and we add an error message
render(request, 'form.html', {'form':form,'error','This email is already in use'})
else:
form = CustomerForm()
return render(request, 'form.html', {'form':form})
<form action="/customer/" method="post">
{% if error %}
<b> {{ error }} </b> <br>
{% endif %}
{% csrf_token %}
{{ form }}
<input type="submit" value="Submit">
</form>
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