Our schema.rb is being generated with an `add_index` line similar to this:
add_index "foo", ["foo", "bar"], :name => "xxx", :length => {"foo"=>8, "bar=>nil}
This is the same as it was on Rails 3.1.3, however, now when that
schema.rb is evaluated, its generating bad SQL in MySQL:
Mysql::Error: You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax
to use near '))' at line 1: CREATE UNIQUE INDEX
`xxx` ON `foo` (`foo`(8), `bar`())
This commit adds a check for nil on the length attribute to prevent the
empty parens from being output.
Conflicts:
activerecord/test/cases/migration/index_test.rb
Signed-off-by: José Valim <jose.valim@gmail.com>
0a75336c89