Show pending migrations in rails
rake db:migrate:status (Rails 3 to 5) or rails db:migrate:status (Rails 5) will accomplish this. See this commit.
up means the migration has been run. down means the migration has not been run.
There is rake db:abort_if_pending_migrations (at least in Rails 2.3.3, not sure when it was introduced). The description says 'Raises an error if there are pending migrations'. This seems to be used more as a prerequisite for other tasks, but I'm guessing you could use it for your purposes.
EDIT: Here is an example of the output after having just generated and not run a 'test' migration
rails_project theIV$ rake db:abort_if_pending_migrations(in /Users/theIV/Sites/rails_project/)You have 1 pending migrations: 20090828200602 TestRun "rake db:migrate" to update your database then try again.
This command will list all migrations with their status (UP or DOWN)
Rails 3 and 4
rake db:migrate:statusRails 5
rake db:migrate:status# Orrails db:migrate:status