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2013 Jan 20
20
ActiveRecord::Persistence.increment! requires a row lock to ensure isolated updates
The method is here:
https://github.com/rails/rails/blob/master/activerecord/lib/active_record/persistence.rb#L288.
The method takes the in-memory attribute value and increments it by the
specified amount. A safer approach (from an isolation standpoint) would be
to let the database determine the value. Instead of telling the database
what value to persist in the database, the SQL can written