Dear fellow Formencode Enthusiasts:
I want to chain a field B to an existing field A, such that if user inputs a
value for field A, then field B is required, otherwise if field A is empty,
field B is not required. I looked at RequireIfPresent, and I believe I know
how to use it:
>>> from formencode import validators
>>> ripi_01 = validators.RequireIfPresent('phone_type_pri',
present='primary_phone')
>>> ripi_01.to_python({'phone_type_pri':'', 'primary_phone':'510 420 4577'})
Invalid: You must give a value for phone_type_pri
>>> ripi_01.to_python({'phone_type_pri':'', 'primary_phone':''})
{'phone_type_pri': '', 'primary_phone': ''}
>>>
but I can't seem to get it to work in context of my schema. I get a
"Missing value" error message that at first made me conclude my schema was
expecting 'phone_type_pri' to be required, and yet when I do input a value
for phone_type_pri, e.g., 'home phone', I get the exact same error message
as before ! It seems no matter what I do (e.g., if I leave primary_phone
empty, if I select a value for phone_type_pri), I will get the following
error:
phone_type_pri: Missing value
I searched on Google for RequireIfPresent and "missing value" and saw at
least one other user (negus on the Pylons list) with this problem. Please
let me know if I am doing something wrong:
class Appl_Form(formencode.Schema):
email = validators.Email(resolve_domain=True, not_empty=True)
confirm_email = validators.Email(not_empty=True)
primary_phone = validators.PhoneNumber()
phone_type_pri = validators.PlainText()
chained_validators = [validators.FieldsMatch('email', 'confirm_email'),
validators.RequireIfPresent('phone_type_pri', present='primary_phone')]
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