Custom validation error messages

[Anand]

Hi,

I am using deform with pyramid. I want to customize the error message for validation failures. My schema field looks like

username = colander.SchemaNode(colander.String(), name="username",
        title="Username", oid="login-username",
        widget=TextInputWidget(size=40, css_class="input-xlarge"))

This is a 'require' field. The default validator provided by colander throws a Invalid exception with a message 'Required'. I want to customize this message and provide more meaningful message. Is there a way to change this error message? I could write a custom validator, but the 'required' field validation happens before my custom validator is executed. Besides, I don't want to write custom validators for every field in my application.

Is there a way to pass in a validation message to colander field validations?

Anand

[Douglas Cerna]

I do it this (very dumb and probably dangerous) way:

----- %< -----
class RequiredSchemaNode(colander.SchemaNode):

def deserialize(self, *args, **kw):
try:
return super(RequiredSchemaNode, self).deserialize(*args, **kw)
except (colander.Invalid,), e:
if e.args[-1] == 'Required':
raise colander.Invalid(self, _('Required input is missing.'))
raise
----- %< -----

I hope at least give you an idea.

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