Implement rails encryption on meta fields.

[MrNagoo]

I'm starting to use rails encryption and I'd like to be able to specify jsonb fields to encrypt.

jsonb_accessor :metadata,
    field_1: :string,
    field_2: :integer

encrypts :field_1

instead of

encrypts :metadata

I'm using STI and wouldn't like to create real columns on the table.

[haffla]

Yes this sounds like a cool feature.

[haffla]

What's wrong with?

encrypts :metadata

[MrNagoo]

Some of the fields don't need to be encrypted so they can make it into our analytics tools without having to share a decryption key.

In the example, we want field_2 as clear text.

[bschrag]

I'm looking to do something similar. I'm curious, would it work to use a setter method, similar to how bcrypt handles setting of password_digest through password=. My thought on this would be that the fields that need encryption would be called encrypted_, so in the example:

jsonb_accessor :metadata,
    encrypted_field_1: :string,
    field_2: :integer

Then create a setter and getter:

def field_1=(v)
   self.encrypted_field_1 = my_encryptor.encrypt_and_sign(v)
end

def field_1
  my_encryptor.decrypt_and_verify(encrypted_field_1)
end

This was the approach I had in mind but I'm curious if there's something I might be overlooking.