call custom callback before indexing

[francescob]

Hi, i need to execute a specific callback before indexes are created, is that possible at all? or to execute some code on the record before indexing?
Thanks

[ankane]

Hey @francescob, I believe the best way right now is to use Module#prepend to override the compute_attribute_bidx method (replace attribute with your attribute name). Can you explain your use case a bit more?

module BlindIndexCallback
  def compute_attribute_bidx
    # callback code
    # ...
    super
  end
end

Model.prepend(BlindIndexCallback)

[francescob]

Basically, it's an application where only users with specific roles can decrypt encrypted attributes, to every other user the value is hidden ( ******* is shown). that is managed by setting a virtual attribute with result of can? :decrypt, record ( cancancan ability) in a controller before action. In that way the value of encrypted attributes is hidden by default, and so when I do BlindIndex.backfill every index get filled with ******
I managed to workaround by setting the can_decrypt attribute to true with an after initialize, but I would like not to do that because I prefer to keep it hidden by default

[francescob]

Anyhow, the proposed solution works, thank you very much for the tip (and all the great gems)

[ankane]

Great, glad it worked! compute_attribute_bidx is a public API, so this should be stable.