method

sum

v2.1.0 - Show latest stable - 2 notes - Class: ActiveRecord::Calculations::ClassMethods

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What's this?

sum(column_name, options = {}) public

Calculates the sum of values on a given column. The value is returned with the same data type of the column. See calculate for examples with options.

  Person.sum('age')

Show source

# File activerecord/lib/active_record/calculations.rb, line 73
      def sum(column_name, options = {})
        calculate(:sum, column_name, options) || 0
      end