implement rename_index natively for MySQL > 5.7

dmitriy-kiriyenko · Nov 28, 2013 · a9771dd · a9771dd
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diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Implement rename_index natively for MySQL > 5.7.
+
+    *Cody Cutrer*
+
 *   Fix bug when validating the uniqueness of an aliased attribute.
 
     Fixes #12402.

diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -487,6 +487,14 @@ def rename_table(table_name, new_name)
         rename_table_indexes(table_name, new_name)
       end
 
+      def rename_index(table_name, old_name, new_name)
+        if version[0] >= 5 && version[1] >= 7
+          execute "ALTER TABLE #{quote_table_name(table_name)} RENAME INDEX #{quote_table_name(old_name)} TO #{quote_table_name(new_name)}"
+        else
+          super
+        end
+      end
+
       def change_column_default(table_name, column_name, default)
         column = column_for(table_name, column_name)
         change_column table_name, column_name, column.sql_type, :default => default