method

sum

v1.2.6 - Show latest stable - 2 notes - Class: ActiveRecord::Calculations::ClassMethods

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What's this?

sum(column_name, options = {}) public

Calculates the sum value 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 72
      def sum(column_name, options = {})
        calculate(:sum, column_name, options)
      end

September 25, 2008

6 thanks

Expressions in the sum method

Person.sum(“2 * age”)

Person.sum(:age, :conditions=>'1 = 2')

January 18, 2011

2 thanks

sum

Expressions in the sum method

Person.sum(“2 * age”)

Grouping

Person.sum(:age, :group => “sex”) # =>[[“male”,2500],[“female”,2200]]

sum

Related methods

Expressions in the sum method

Person.sum(“2 * age”)

Grouping

Person.sum(:age, :group => “sex”) # =>[[“male”,2500],[“female”,2200]]