Rerunning a specific ActiveRecord migration in Rails

In production and team environments rerunning prior Rails database migrations is generally not recommended. However there are times when it can be useful, for example when revising a feature branch that has yet to be committed, based on a change to the data model.

In this case, the previous migration may be run again using the form rails db:migrate:redo VERSION=xxxxxxx, for example:

$ rails db:migrate:redo VERSION=20200718231958
== 20200718231958 CreateProducts: reverting ====================================
-- drop_table(:products)
   -> 0.0360s
== 20200718231958 CreateProducts: reverted (0.0473s) ===========================

== 20200718231958 CreateProducts: migrating ====================================
-- create_table(:products)
   -> 0.0294s
== 20200718231958 CreateProducts: migrated (0.0295s) ===========================

db:migrate:redo can also be used with a STEP parameter:

$ rails db:migrate:redo STEP=2

This reverts the previous 2 migrations, and runs them again.

Links

• Active Record Migrations