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-rw-r--r--activerecord/lib/active_record/explain.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/explain.rb b/activerecord/lib/active_record/explain.rb
index 7ccb938888..919e96cd7a 100644
--- a/activerecord/lib/active_record/explain.rb
+++ b/activerecord/lib/active_record/explain.rb
@@ -18,7 +18,7 @@ module ActiveRecord
# Returns a formatted string ready to be logged.
def exec_explain(queries) # :nodoc:
str = queries.map do |sql, binds|
- msg = "EXPLAIN for: #{sql}".dup
+ msg = +"EXPLAIN for: #{sql}"
unless binds.empty?
msg << " "
msg << binds.map { |attr| render_bind(attr) }.inspect