method

average

rails latest stable - Class: ActiveRecord::Calculations

average(column_name)

public

Calculates the average value on a given column. Returns nil if there’s no row. See #calculate for examples with options.

Person.average(:age) # => 35.8

# File activerecord/lib/active_record/relation/calculations.rb, line 116
    def average(column_name)
      calculate(:average, column_name)
    end