rails/rails — pull request #13589 by 907th (2014-01-04 16:56:17+00:00)
Title: Fix ActiveRecord::Migrator#needs_migration? inconsistency (fix #10856)

Issue (see #10856 too):
Consider the situation when there are 3 migrations:
* 1st is up,
* 2nd is down,
* 3rd is up.
In such case `ActiveRecord::Migrator.needs_migration?` returns `false`,
but it should return `true`.

Consequences:
Pending migrations check in development environment will not work
(see `config.active_record.migration_error` option).

Solution:
Consider all migrations while checking for pending ones
(not only the latest migration).

Tests were added for the issue and `ActiveRecord::Migration::CheckPending`
middleware.