[英]Django model validation not raising Exception on full_clean()
I have a Model
and ModelForm
with custom validator (which only allows "H" or "A" in the CharField):我有一个Model
和带有自定义验证器的ModelForm
(在 CharField 中只允许“H”或“A”):
def home_away_valid(value):
return value == 'H' or value == 'A'
class Team(models.Model):
name = models.CharField(max_length=180)
home = models.CharField(max_length=2, validators=[home_away_valid], default='H', db_index=True)
class TeamForm(ModelForm):
class Meta:
model = Team
fields = ['home', 'name']
However when I run full_clean() with another value (not H or A) it doesn't not raise a validation exception:但是,当我使用另一个值(不是 H 或 A)运行 full_clean() 时,它不会引发验证异常:
try:
team = TeamForm({
'name': 'Test Team',
'home': 'S'
})
team.full_clean()
new_team = team.save()
print(new_team.id)
except ValidationError as e:
print(e)
Why does this not raise an Exception?为什么这不会引发异常? (I have tried doing the full_clean()
on both the ModelForm
and Model
, neither raises an Exception) (我已经尝试在ModelForm
和Model
上执行full_clean()
,但都没有引发异常)
A validator should raise a ValidationError
in case the condition is not met, not return True
or False
, so:验证器应该在不满足条件的情况下引发ValidationError
,而不是返回True
或False
,因此:
from django.core.exceptions import ValidationError
def home_away_valid(value):
if value not in ('H', 'A'):
raise ValidationError('Must be home or away')
You also might want to use 'H'
and 'A'
as choices, this will render the form with a ChoiceField
, making it less likely to make mistakes:您可能还想使用'H'
和'A'
作为选择,这将使用ChoiceField
呈现表单,从而减少出错的可能性:
class Team(models.Model):
HOME_AWAY = (
('H', 'Home'),
('A', 'Away')
)
name = models.CharField(max_length=180)
home = models.CharField(max_length=2, choices=HOME_AWAY, validators=[home_away_valid], default='H', db_index=True)
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