average(column_name, options = {})
public
Calculates the average
value on a given column. The value is returned as a float, or nil
if there’s no row. See calculate
for examples with options.
Person.average('age')
# File activerecord/lib/active_record/calculations.rb, line 56
def average(column_name, options = {})
calculate(:avg, column_name, options)
end
