sorry...got a little crazy with the copy and past. This one should
look cleaner:
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
"""
# where to upack args passed to __init__
__unpackargs__ = ('*','field_names')
#error message
messages = {'invalid':"%(fst)s %(lst)s not unique"}
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('invalid', state,
fst=fname, lst=lname)
raise Invalid(msg, field_dict, state,
error_dict={'form':msg})
return field_dict
def _valid_name(self, fname, lname):
'''check the database here'''
return not (fname, lname) in [
('Speed', 'Racer'),
('Racer', 'X'),
('Harvey', 'Goldsmith')
]
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