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-rw-r--r--activerecord/lib/active_record/schema_dumper.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/schema_dumper.rb b/activerecord/lib/active_record/schema_dumper.rb
index 718669a1b7..6c896f7bed 100644
--- a/activerecord/lib/active_record/schema_dumper.rb
+++ b/activerecord/lib/active_record/schema_dumper.rb
@@ -1,3 +1,5 @@
+require 'stringio'
+
module ActiveRecord
# This class is used to dump the database schema for some connection to some
# output format (i.e., ActiveRecord::Schema).