What to do when you want to delete a migration file that is "NO FILE"


About this article
When I checked the status with "rails db: migrate: status" while making my own application, I found a migration file that says "NO FILE". Post as a memorandum how to delete because it is an unnecessary file!

[environment] ・ Ruby 2.6.5, Rails 6.0.0 ・ MacOS

% rails db:migrate:status

"NO FILE" is displayed when checking the status

Status   Migration ID    Migration Name
--------------------------------------------------
up     20201201125021  Remove name from tweets
up     20201202142455  Create comments
up     20201206104547  ********** NO FILE **********

Enter the following command

% vim db/migrate/(migration_file_id)_tmp.rb 　　*in this case"20201206104547"
class Tmp < ActiveRecord::Migration
  def change
  end
end

Check the status again

% bundle exec rake db:migrate:status

It changes to the "Tmp" you entered earlier

Status   Migration ID    Migration Name
--------------------------------------------------
up     20201201125021  Remove name from tweets
up     20201202142455  Create comments
up     20201206104547  Tmp

Change status to down

% bundle exec rake db:migrate:down VERSION=(migration_file_id)

Status   Migration ID    Migration Name
--------------------------------------------------
up     20201201125021  Remove name from tweets
up     20201202142455  Create comments
down     20201206104547  Tmp

delete

% rm -rf db/migrate/20150708134153_tmp.rb

Finally check the status

% bundle exec rake db:migrate:status

Status   Migration ID    Migration Name
--------------------------------------------------
up     20201201125021  Remove name from tweets
up     20201202142455  Create comments

It has disappeared!

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