Thanks, I will try that. That's exactly what I am looking for.
Although I really would like to get hold hold of that object being
added, because I have to validate it's value exist in another separate
domain.
On 4/1/10, Peter Willis <
[hidden email]> wrote:
> Sorry, got sent out to early.
>
> tires validator: { obj, car ->
> car.tires.find { it.tire_type == obj // ?? What here ?
> obj.tire_type doesn't seem to be working
> }
>
> obj is an instance of the collection.. and both car.tires and
> obj.tires are the same.. even when I do a addToTires ...
>
> How can I do this check ?
>
> Note. I am not really working with cars or tires.
>
> On 4/1/10, Peter Willis <
[hidden email]> wrote:
>> Mikes writes here :
>>
http://little418.com/2009/05/validate-that-a-grails-hasmany-relationship-has-at-least-one-child.html>>
>> about constraining a hasMany relationship which is pretty
>> straighforward, because he just checks for size.
>>
>> How can I find out if there isn't two left-rear tires though ?
>>
>> class Tire { // Note
>> String tire_type // left-rear, right-rear....
>> static belongsTo = [car:Car]
>> }
>>
>> class Car {
>> String licence_number
>> static hasMany = [tires:Tire]
>> }
>>
>> I want to write a custom validator to find out if there isn't already
>> a left-rear tire for a Car, in it's own hasMany relationship.
>> Therefore, I need to reach the
>>
>
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