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-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb8
1 files changed, 8 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
index b737268f61..9bae880024 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
@@ -192,6 +192,14 @@ module ActiveRecord
# Set to true to drop the table before creating it.
# Defaults to false.
#
+ # Note that +create_join_table+ does not create any indices by default; you can use
+ # its block form to do so yourself:
+ #
+ # create_join_table :products, :categories do |t|
+ # t.index :products
+ # t.index :categories
+ # end
+ #
# ====== Add a backend specific option to the generated SQL (MySQL)
# create_join_table(:assemblies, :parts, options: 'ENGINE=InnoDB DEFAULT CHARSET=utf8')
# generates: