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-rw-r--r--activerecord/lib/active_record/relation/calculations.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/relation/calculations.rb b/activerecord/lib/active_record/relation/calculations.rb
index d3b5be6bce..42d43224fa 100644
--- a/activerecord/lib/active_record/relation/calculations.rb
+++ b/activerecord/lib/active_record/relation/calculations.rb
@@ -259,6 +259,9 @@ module ActiveRecord
column = aggregate_column(column_name)
select_value = operation_over_aggregate_column(column, operation, distinct)
+ if operation == "sum" && distinct
+ select_value.distinct = true
+ end
column_alias = select_value.alias
column_alias ||= @klass.connection.column_name_for_operation(operation, select_value)