Ruby on Rails latest stable (v4.2.7) - 2 notes - Class: ActiveRecord::Calculations::ClassMethods

Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v2.3.8) is shown here.

These similar methods exist in v4.2.7:

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, 0 if there’s no row. See calculate for examples with options.

  Person.sum('age') # => 4562
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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


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