[Zope3-dev] Re: __repr__ of ValidationErrors in zope.schema

Philipp von Weitershausen philipp at weitershausen.de
Fri Aug 24 07:03:30 EDT 2007

Christian Zagrodnick wrote:
> I'm implementing the getValidationErrors thingy right now and once again 
> stumbled upon the ValidationErrors. Their __repr__ is all but useful.
> For instance "TooSmall":
>>>> TooSmall(8, 10)
> 8 10
> Another sort of related issue is that you only get the __doc__ string 
> when calling the .doc() method. "Value is too small." doesn't help a lot.
> Something like "The value 8 is too small. At least 10 is required." 
> would be much more informative.
> What should we do about this?

I'd say, fix it :). You seem to have a pretty good understanding of how 
this should be fixed already.

Note that a ValidationError's docstring is used for the error message in 
forms. A change will therefore likely cause functional tests to break, 
both within Zope and especially in 3rd party packages. I think this is 
an acceptable risk to take as long as we're *improving* the error 
messages (which is hard to do w/o breaking some ftests).

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