[Seaside] Re: [Mewa] Can't format multipleRelationshipAttribute

[Adrian Lienhard]

Hi German

If the block taken by #addValidationRule: evaluates to true, the attribute
is assumed to be valid. So, you just have to make it the other way round...

If you want to assure that at least one item is selected use something like:
...addValidationRule: [:collection | collection isEmpty not]

Adrian

> By example, in the same multiple relationship I want to check that at
> least one  interest is checked, as follow:
>
>     relationshipTo: [MySession currentSession domainmodel interests]
>     formatWith: [:each | each interestName, ' (' , each interestType
> , ')'];
>
>     addValidationRule: [:collection | collection size < 1]
>     errorString: 'Select at least one interest' translated].
>
> Thanks by your time.
>
> gsa.
>
>
>
>
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Adrian Lienhard
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