Mongoid v2.2.4 Release Notes
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#1377 Fix aggregation functions to properly handle nil or undefined values. (Maxime Garcia)
#1373 Warn if a scope overrides another scope.
#1372 Never persist when binding inside of a read attribute for validation.
🔀 #1358 Fixed type error on many to many synchronization when inverse_of is set to nil.
#1356 $in criteria can now be chained to non-complex criteria on the same key without error.
🛠 #1350, #1351 Fixed errors in the string conversions of double quotes and tilde when parameterizing keys.
#1349 Mongoid documents should not blow up when including Enumerable. (Jonas Nicklas)