[RUBY] Rails "How to delete NO FILE migration files"

Status

I deleted the migration file after executing $ rails db: migrate, and a NO FILE file was created.

Solution

1. Check the status of migrate.

Terminal


rails db:migrate:status

Then it will be displayed like this ↓

Terminal


 Status   Migration ID    Migration Name
--------------------------------------------------
   up     20200602094458  Create messages
   up     20200604080747  ********** NO FILE **********
2. Copy and paste the Migration ID of NO FILE to create a dummy file. (Hoge is optional)

Terminal


touch db/migrate/20200604080747_hoge.rb
3. Create the contents of the dummy file.

20200604080747_hoge.rb



class Hoge < ActiveRecord::Migration[5.2]
  def change
  end
end
4, Confirm that the Migration Name is given.

Terminal


rails db:migrate:status

Then it will be displayed like this ↓

Terminal


 Status   Migration ID    Migration Name
--------------------------------------------------
   up     20200602094458  Create messages
   up     20200604080747  Hoge
5. Set the Status of the migration file you want to delete down. ($ rails db migrate, restore before execution)

Terminal


rails db:migrate:down VERSION=20200604080747

Check if it is down

Terminal


rails db:migrate:status

↓

Terminal


 Status   Migration ID    Migration Name
--------------------------------------------------
   up     20200602094458  Create messages
  down    20200604080747  Hoge
6, delete after confirming down
 Status   Migration ID    Migration Name
--------------------------------------------------
   up     20200602094458  Create messages

Be careful when handling migration files. It's a considerable loss of time.

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