increment(attribute, by = 1)public
Initializes attribute to zero if nil and adds the value passed as by (default is 1). The increment is performed directly on the underlying attribute, no setter is invoked. Only makes sense for number-based attributes. Returns self.
# File activerecord/lib/active_record/persistence.rb, line 181 def increment(attribute, by = 1) self[attribute] ||= 0 self[attribute] += by self end