allow lazy decrypted vault attributes to be referenced after a destroy #110
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chrisarcand
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Sep 29, 2020
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I think this workaround is very reasonable as a default, and defines behavior that was never guaranteed before anyway.
If there's some reason that it's undesirable to load lazy attributes on destroys, the inverse of your second option (forcing a destroy without loading the attributes) can be added later.
joekarl
approved these changes
Sep 29, 2020
After destroying a record, ActiveRecord marks the in-memory object as frozen and unable to be altered. This is fine, unless lazy decrypt is enabled and you need to access an encrypted attribute after the destroy happens - for instance, as part of a dependent: :destroy chain. In that case, vault-rails will attempt to set the plaintext attribute _after_ the destroy, raising a "Can't modify frozen hash" error. This commit ensures that encrypted attributes are always decrypted prior to a destroy.
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After destroying a record, ActiveRecord marks the in-memory object as frozen and unable to be altered. This was fine in older versions of Rails prior to the attributes API, and it's mostly fine now. However, if lazy decrypt is enabled and you need to access an encrypted attribute after the destroy happens -- for instance, as part of a
dependent: :destroychain -- vault-rails attempts to set the plaintext attribute on the frozen object, raising a "Can't modify frozen hash" error.As a workaround, this PR ensures that attributes are decrypted before a destroy so the plain text values can be accessed by after-destroy hooks if needed.
Currently, I've set this as universal behavior, since being able to access encrypted attributes after a destroy was the default prior to #67. However, another possibility would be only enabling this behavior for specific attributes, via something along these lines: