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schema.rbにマイグレーションファイルが反映されない!

開発環境

ubuntu(WSL)
Rails 5.2
Postgresql

想定エラー内容

ActionView::Template::Error (PG::UndefinedColumn: ERROR:  column tasks.user_id does not exist
LINE 1: SELECT "tasks".* FROM "tasks" WHERE "tasks"."user_id" = $1 O...

原因

一概には言えないですが、おそらくrails:db migrateした後にマイグレーションファイルを書き換えている。

対処法

rails db:migrate:statusで反映されているか確認する。
upは反映済み。downは未反映。

 Status   Migration ID    Migration Name
--------------------------------------------------
   up     20200213054056  Create users
   up     20200214132021  Add user id to tasks

rails db:migrate:rollbackで戻す。
マイグレーションファイルを書き換えて再び、rails db:migrateを実行する。

参考文献

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