ruby テーブルにuser_idカラムを追加するためのマイグレーションファイルを作成

Question

aberyuuokunoAir:mooovi ryuki$ rails g migration AddUserIdToReviews user_id:integer
invoke active_record
create db/migrate/20160509082306_add_user_id_to_reviews.rb

aberyuuokunoAir:mooovi ryuki$ bundle exec rake db:migrate
== 20160506142807 RemoveNickNameFromReviews: migrating ========================
-- remove_column(:reviews, :nickname, :string)
rake aborted!
StandardError: An error has occurred, all later migrations canceled:

Mysql2::Error: Can't DROP 'nickname'; check that column/key exists: ALTER TABLE reviews DROP nickname
/Users/ryuki/projects/mooovi/db/migrate/20160506142807_remove_nick_name_from_reviews.rb:3:in change' ActiveRecord::StatementInvalid: Mysql2::Error: Can't DROP 'nickname'; check that column/key exists: ALTER TABLE reviewsDROPnickname/Users/ryuki/projects/mooovi/db/migrate/20160506142807_remove_nick_name_from_reviews.rb:3:inchange'
Mysql2::Error: Can't DROP 'nickname'; check that column/key exists
/Users/ryuki/projects/mooovi/db/migrate/20160506142807_remove_nick_name_from_reviews.rb:3:in `change'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)
エラーとなりエラーとなりますがどうすれば良いでしょうか。

Answer 1

おそらく不要と思われる

/Users/ryuki/projects/mooovi/db/migrate/20160506142807_remove_nick_name_from_reviews.rb

というファイルを削除すればいいと思います。