Re: Chained validators and error messages

Since you wrote that this is something like a special case, whilst i'm  
finding myself using it over and over again, I'm wondering if there is  
a better/more standard way to put error message raised by a chained  
validator near a specific form field.

Or, if the chained validator is the standard way to solve my problem.  
Basically, what I'm trying to do is to check if a field fulfill a  
certain constraint where the constraint varies with the value of  
another field. I thought that checking each field per se (according  
their own validation rules) and then checking them in combination  
(using a chained validator) was a good approach, but I'm a beginner so  
I might be wrong. Is there any more standar way to get this done?

TIA,
  Andrea

On 5 Mar, 2009, at 04:48, Ian Bicking wrote:

> On Wed, Mar 4, 2009 at 3:57 AM, Andrea Riciputi <[email protected] 
> > wrote:
>> I'm trying to make htmlfill to put the error message raised by a
>> chained validator near a specific form field.
>>
>> To get this I've written a custom validator where the messages dict  
>> is
>> defined like this:
>>
>> messages = {'my_error_label': u"Error message goes here" }
>>
>> then, if the conditions are not met I raise the Invalid exception  
>> like
>> this:
>>
>> raise Invalid(self.message('my_error_label', state),
>> values, state,
>> error_dict={
>> 'my_error_label': Invalid(self.message('field_name', state), values,
>> state)
>> })
>>
>> Despite the fact this gives me the expected result, I'm not sure I'm
>> raising that exception in the correct way. I mean, I got the
>> impression that the Invalid instance could be called in easier way,
>> but I really can't see how. Any suggestion?
>
> Yeah, that's right -- it's a little awkward, but usually this
> particular kind of exception is only raised in Schema, so people don't
> see the awkwardness as much ;)
>
>
>
> -- 
> Ian Bicking  |  http://blog.ianbicking.org


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