我是 Web2py 的新手，正在尝试使用自定义验证器。
class IS_NOT_EMPTY_IF_OTHER(Validator):
def __init__(self, other,
error_message='must be filled because other value '
'is present'):
self.other = other
self.error_message = error_message
def __call__(self, value):
if isinstance(self.other, (list, tuple)):
others = self.other
else:
others = [self.other]
has_other = False
for other in others:
other, empty = is_empty(other)
if not empty:
has_other = True
break
value, empty = is_empty(value)
if empty and has_other:
return (value, T(self.error_message))
else:
return (value, None)
我不明白如何在我的 table 上使用它:
db.define_table('numbers',
Field('a', 'integer'),
Field('b', 'boolean'),
Field('c', 'integer')
我想以一种方式使用它，即在勾选 'b' 时不能将 'c' 保留为黑色。
最佳答案
将代码保存在/modules/customvalidators.py
from gluon.validators import is_empty
from gluon.validators import Validator
class IS_NOT_EMPTY_IF_OTHER(Validator):
def __init__(self, other,
error_message='must be filled because other value '
'is present'):
self.other = other
self.error_message = error_message
def __call__(self, value):
if isinstance(self.other, (list, tuple)):
others = self.other
else:
others = [self.other]
has_other = False
for other in others:
other, empty = is_empty(other)
if not empty:
has_other = True
break
value, empty = is_empty(value)
if empty and has_other:
return (value, T(self.error_message))
else:
return (value, None)
然后在模型/db.py
from customvalidator import IS_NOT_EMPTY_IF_OTHER
db.define_table("foo",
Field('a', 'integer'),
Field('b', 'boolean'),
Field('c', 'integer')
)
# apply the validator
db.foo.c.requires = IS_NOT_EMPTY_IF_OTHER(request.vars.b)
另请注意，无需上述验证器即可轻松完成 。
忘记上面的所有代码并尝试这种简化的方式
版本 2:
controllers/default.py
def check(form):
if form.vars.b and not form.vars.c:
form.errors.c = "If the b is checked, c must be filled"
def action():
form = SQLFORM(db.foo)
if form.process(onvalidation=check).accepted:
response.flash = "success"
return dict(form=form)
关于python - Web2py 自定义验证器，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/14724584/