method

sum

v6.1.7.7 - Show latest stable - Class: ActiveRecord::Calculations

sum(column_name = nil)

public

Calculates the sum of values on a given column. The value is returned with the same data type of the column, 0 if there’s no row. See #calculate for examples with options.

Person.sum(:age) # => 4562

# File activerecord/lib/active_record/relation/calculations.rb, line 86
    def sum(column_name = nil)
      if block_given?
        unless column_name.nil?
          raise ArgumentError, "Column name argument is not supported when a block is passed."
        end

        super()
      else
        calculate(:sum, column_name)
      end
    end

sum

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