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I need to override hook_field_validate() for a particular field (provided by the Video Embed Field module). The description for that hook states:

Validate this module's field data.

So the idea is that it's only invoked for the module that implements a particular field, which makes sense.

Unfortunately there's no altering mechanism in place (that I can find) so the implementations of those hooks are pretty much hard-coded. Also the hook is never run through module_implements() (as you would expect), so in turn is not available to be overridden using hook_module_implements_alter().

Does anyone know of a way, however unclean, of overriding hook_field_validate() for a particular field implementation, without hacking any core/contrib modules?

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    The code is aiming a specific function that must be implemented in a specific module (the one implementing the field); that is why the code doesn't use module_implements(), nor module_invoke_all(). As consequence, hook_module_implements_alter() is not invoked too. – kiamlaluno Jul 28 '12 at 15:48
  • Yeah I understand why it does that (similar to the hooks invoked for node type modules), I'm just trying to find a way to override it. @Oswald's solution looks promising I'm just testing it out – Clive Jul 28 '12 at 15:54
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There is hook_field_attach_validate(), which is invoked by the single function that invokes hook_field_validate(), namely field_attach_validate(), which is called by field_attach_form_validate().

I did not find an obvious way to get rid of the original validation function, but a quick hack would be to remove the errors, that the original validation function produced, from the $errors array in your hook_field_attach_validate() implementation.

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    As the errors are just returned in that $errors array, and they are not yet printed with drupal_set_message(), altering the array is the way to go. I was going to answer the question, and I would have given the same answer. – kiamlaluno Jul 28 '12 at 15:58
  • Thanks both this is definitely the way to go. I had to abandon the whole thing unfortunately because of limitations in the video embed module but I tested this and it works great – Clive Jul 28 '12 at 17:26

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