Todd,
You're going to need to roll your own FormValidator, similar to
formencode.validators.RequireIfMissing. Here's an example that you
can use as a starting point
from formencode import Invalid
from formencode.validators import FormValidator
class UniqueNameValidator(FormValidator):
"""checks if a first name, last name combo exists
>>> unv = UniqueNameValidator('fname', 'lname')
>>> unv.to_python({'fname':'Atticus', 'lname':'Finch'})
{'lname': 'Finch', 'fname': 'Atticus'}
>>> unv.to_python({'fname':'Racer', 'lname':'X'})
Traceback (most recent call last):
...
Invalid: The name Racer X already exists
"""
# tells UniqueNameValidator where to unpack the args passed to
__init__
__unpackargs__ = ('*','field_names')
#error message
messages = {'name_exists':"The name %(fst)s %(lst)s already
exists"}
field_names = None
def validate_python(self, field_dict, state):
fname = field_dict[self.field_names[0]]
lname = field_dict[self.field_names[1]]
if not self._valid_name(fname, lname):
msg = self.message('name_exists', state, fst=fname,
lst=lname)
raise Invalid(msg, field_dict, state,
error_dict={'form':msg})
return field_dict
def _valid_name(self, fname, lname):
'''This is where you would query the database to check for
existing names'''
return not (fname, lname) in [
('Speed', 'Racer'), ('Racer', 'X'), ('Harvey',
'Goldsmith')
]
def _valid_name(self, fname, lname):
'''This is where you would query the database to check for
existing names'''
return not (fname, lname) in self.names
You schema should look like this:
class AddSubmitterForm(BaseForm):
first_name = formencode.validators.String(not_empty = True)
last_name = formencode.validators.String(not_empty = True)
phone = formencode.validators.PhoneNumber(not_empty = True)
email = formencode.validators.Email(not_empty = True)
chained_validators = [UniqueNameValidator('first_name',
'last_name')]
Hope that helps,
- Kurt
On Mar 5, 11:39 am, Todd J <[EMAIL PROTECTED]> wrote:
> Hey everyone,
>
> I am trying to use a formencode Schema to validate a compound field.
> Basically I have this:
>
> class BaseForm(formencode.Schema):
> allow_extra_fields = True
> filter_extra_fields = True
>
> class AddSubmitterForm(BaseForm):
> first_name = formencode.validators.String(not_empty = True)
> last_name = formencode.validators.String(not_empty = True)
> phone = formencode.validators.PhoneNumber(not_empty = True)
> email = formencode.validators.Email(not_empty = True)
>
> I just want to ensure that the first_name AND the last_name are
> unique. So if 'Todd Johnson' is in the database already and I try to
> add 'Todd Johnson' it will not validate, but if I try to add 'Todd
> Smith' or 'Bob Johnson' that will validate.
>
> This is my first attempt at using formencode so I figure this is an
> elementary question, but I couldn't quite figure it out. Thanks in
> advance for your time and your help.
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