method
sum
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Class: ActiveRecord::Calculations
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sum(initial_value_or_column = 0, &block)
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
When given a block, loads all records in the relation, if the relation hasn’t been loaded yet. Calls the block with each record in the relation. Returns the sum of initial_value_or_column and the block return values:
Person.sum { |person| person.age } # => 4562 Person.sum(1000) { |person| person.age } # => 5562
Note: If there are a lot of records in the relation, loading all records could result in performance issues.