rails/rails — pull request #8292 by yahonda (2012-11-21 21:29:41+00:00)
Title: Addresses undefined local variable or method `connection' error

This commit addresses following error since 48a035712e9a4478ff248fd51ff43505d2aa2ddb merged.

```
1) Error:
test_create_join_table_with_symbol_and_string(CopyMigrationsTest):
NameError: undefined local variable or method `connection' for #
test/cases/migration_test.rb:760:in `test_create_join_table_with_symbol_and_string'
```