method

sum

v4.0.2 - Show latest stable - Class: ActiveRecord::Calculations

sum(*args)

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 58
    def sum(*args)
      if block_given?
        ActiveSupport::Deprecation.warn(
          "Calling #sum with a block is deprecated and will be removed in Rails 4.1. "            "If you want to perform sum calculation over the array of elements, use `to_a.sum(&block)`."
        )
        self.to_a.sum(*args) {|*block_args| yield(*block_args)}
      else
        calculate(:sum, *args)
      end
    end

sum

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