method
execute_simple_calculation
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Class: ActiveRecord::Calculations
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execute_simple_calculation(operation, column_name, distinct)
private
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# File activerecord/lib/active_record/relation/calculations.rb, line 187 def execute_simple_calculation(operation, column_name, distinct) #:nodoc: column = if @klass.column_names.include?(column_name.to_s) Arel::Attribute.new(@klass.unscoped, column_name) else Arel::SqlLiteral.new(column_name == :all ? "*" : column_name.to_s) end # Postgresql doesn't like ORDER BY when there are no GROUP BY relation = except(:order).select(operation == 'count' ? column.count(distinct) : column.send(operation)) type_cast_calculated_value(@klass.connection.select_value(relation.to_sql), column_for(column_name), operation) end