#23: Add support for ValidationWarning
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Reporter: adrian | Owner: jgeskens
Type: New feature | Status: assigned
Component: Forms | Version:
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 1
Needs tests: 0 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 1
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Comment (by sebleblanc):
I do not think that such a feature is useful, as it can easily be
implemented using standard Django machinery.
Here is an example, supposing that I am writing a user register form,
where the date of birth is optional, but I want to warn the user that they
would miss on some functionality on my site:
Full name
Date of birth
<hidden "Ignore warning" boolean field (default: False)>
Email
Password
Let us say the user fills all the form but the DOB field. In my form
validation, I raise "ValidationError" if the DOB field is empty, and when
the form is returned to the user, I display the hidden field, along with
an explanation, so that the user may dismiss the warning. If the form is
validated again, and the date of birth is still missing, but the checkbox
is True, I then accept the form as submitted.
I think this construct can easily be wrapped in a form field mixin. The
only use for a ValidationWarning exception (derived from ValidationError)
is to make it easier on the form display to determine if the checkbox
should be shown. However, I think that they should be handled as regular
error.
i.e. (e.g) This form is only valid if field `foo` does not contain Unicode
characters, or if `foo` does contains Unicode and that field
`foo_ignore_unicode_warning` is True.
If it had to be implemented, I think that having
`<field>_<reason>_warning` methods would work great.
--
Ticket URL: <https://code.djangoproject.com/ticket/23#comment:32>
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