instance method
sum
Ruby on Rails 5.1.7
Since v3.0.20Signature
sum(column_name = nil)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
Parameters
-
column_nameopt = nil
Source
# File activerecord/lib/active_record/relation/calculations.rb, line 75
def sum(column_name = nil)
return super() if block_given?
calculate(:sum, column_name)
end
Defined in activerecord/lib/active_record/relation/calculations.rb line 75
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Defined in ActiveRecord::Calculations