in reply to Can't call method "MoveBook" on an undefined value
You have a lot of options: BUILD, BUILDARGS, or possibly even "lazy => ..., builder => ..."
At first blush I would say it could be a job for a BUILD routine, but would prefer to see more before saying for certain. If possible I would favor doing it in the attribute's declaration (again, possibly builder).
See Moose::Manual::Construction, and Moose::Manual::Attributes for more explanation.
Dave
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