Add reify_original method.
#1504
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Returning the original version is a common use-case and is not as easy as it should be, particularly because calling `reify` on the first version returns `nil`, which is the `object` *before* it was created. This method simply tries to `reify` from the *second* version, if it exists. If it doesn’t exist (i.e. there has not been any changes to the object), it falls back to `self`, which is the original and *only* version of the object. Fixes paper-trail-gem#1204.
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Returning the original version is a common use-case and is not as easy as it should be, particularly because calling
reifyon the first version returnsnil, which is theobjectbefore it was created.This method simply tries to
reifyfrom the second version, if it exists. If it doesn’t exist (i.e. there has not been any changes to the object), it falls back toself, which is the original and only version of the object.Fixes #1204.
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