Append warnings or raise an exception in development mode when there are pending migrations to run.
It is inspired by this feature that made it in Rails 4.
Note: this has only been tested against Rails 3.2.13 on ruby 2.0.0p247.
Add this line to your application's Gemfile:
gem 'rails_pending_migration_errors', group: :development
And then execute:
$ bundle
If you want to raise errors on page load instead of the default warning, add this to config/environments/development.rb:
config.after_initialize do
RailsPendingMigrationErrors.page_load = true
end