I would suggest using a Validator to do validation, not a Converter (concept
clarity, aviods a pointless getAsString() method).
A few ideas:
I'm not sure you can get anything except the value in this case - the component
and its parent (etc) are of no use. My best suggestion is to write a Facelets
ValidateHandler. This would then allow you to do
<my:validateLimit pk="#{couplingL.id}" />
Then within the ValidateHandler create a new validator with a field containing
the pk. This could then be looked up using a EL or Seam component accessed
programmatically or JNDI or ... BUT I don't know how well this will play with
components in datatables.
Another way to do the same is to make validateLimit a non-rendering component
(with componenthandler) and have it attach a validator to its parent with the
pk field set (which I recall having more luck with than the above due to state
saving stuff).
Or perhaps you could do the validation inside a backing bean access method when
the whole datatable is available, but then you have problems attaching the
FacesMessage onto the correct table row.
It would be good if you reach a solution if you share it :)
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