[RUBY] [Beginner] How to delete NO FILE

I made a mistake in the migration file, deleted it manually in a hurry, and then rails db: migrate resulted in an error. At that time, NO FILE came out.

How to delete

① Check the migration file Check the current status and check the ID of the migration file with $ rails db: migration: status.

$ rails db:migration:status

Status   Migration ID    Migration Name
--------------------------------------------------
   up     20200518132414  Devise create users
   up     20200521083405  Add name to users
   up     20200525013751  Create posts
   up     20200527010431  Add picture to posts
   up     20200528232616  ********** NO FILE **********
   up     20200531083300  Create comments

Confirm that the ID that is NO FILE is 20200528232616

② Create a dummy file Any part of hoge is okay because the file will be deleted later.

touch db/migrate/20200528232616_hoge.rb

20200528232616_hoge.rb

 class Hoge < ActiveRecord::Migrattion[5.3] #5.Match part 3 to the version of rails
   def change
   end
 end

③ Delete the migration file

Check the current situation

$ rails db:migrate:status

Status   Migration ID    Migration Name
--------------------------------------------------
   up     20200518132414  Devise create users
   up     20200521083405  Add name to users
   up     20200525013751  Create posts
   up     20200527010431  Add picture to posts
   up     20200528232616  Hoge　
   up     20200531083300  Create comments

At present, the Migration Name is properly attached like this. From here, change the migration file from up to down.

$ rails db:migration:down VERSION=2020052823261

$ rails db:migrate:status

Status   Migration ID    Migration Name
--------------------------------------------------
   up     20200518132414  Devise create users
   up     20200521083405  Add name to users
   up     20200525013751  Create posts
   up     20200527010431  Add picture to posts
  down    20200528232616  Hoge　
   up     20200531083300  Create comments

After confirming that it is in the down state, delete it.

$ rm db/migrate/db/migrate/20200528232616_hoge.rb

When I check it again,

$ rails db:migrate:status

Status   Migration ID    Migration Name
--------------------------------------------------
   up     20200518132414  Devise create users
   up     20200521083405  Add name to users
   up     20200525013751  Create posts
   up     20200527010431  Add picture to posts
   up     20200531083300  Create comments

It should have disappeared properly! !!

Summary

First of all, even if you make a mistake in the migration file, it is important not to delete it in a hurry in the up state.