MONGOID-5810 make sure we don't leak internal state via as_document (backport to 8.0-stable) #5903
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(Backport from 8.1-stable to 8.0-stable.)
Under certain situations, and when
legacy_attributesis true, the hash returned from#as_documentcan be the actual hash used internally to represent the model. Modifying this hash will modify the internal state of the model, which is unexpected and dangerous.To fix this, the attributes must be deep-duplicated before being returned by
#as_document, iflegacy_attributesis true.This does not affect 9.0-stable and later, because the
legacy_attributessetting was removed when 9.0 was released.