Method: ActiveRecord::Calculations#average

Defined in:
lib/active_record/relation/calculations.rb

#average(column_name) ⇒ Object

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


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# File 'lib/active_record/relation/calculations.rb', line 116

def average(column_name)
  calculate(:average, column_name)
end