method
perform_calculation
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Class: ActiveRecord::Calculations
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perform_calculation(operation, column_name)
private
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# File activerecord/lib/active_record/relation/calculations.rb, line 195 def perform_calculation(operation, column_name) operation = operation.to_s.downcase # If #count is used with #distinct (i.e. `relation.distinct.count`) it is # considered distinct. distinct = distinct_value if operation == "count" column_name ||= select_for_count if column_name == :all if distinct && (group_values.any? || select_values.empty? && order_values.empty?) column_name = primary_key end elsif column_name =~ /\s*DISTINCT[\s(]+/ distinct = nil end end if group_values.any? execute_grouped_calculation(operation, column_name, distinct) else execute_simple_calculation(operation, column_name, distinct) end end