Devise を導入できない

Question

Deviseで登機能を再構築しようと,Userモデルを削除し、rake g devise userでUserモデルを再作成できたのですが、その後のrake db:migrateで詰まりました.

rake db:migrate
== 20170404082436 AddDeviseToUsers: migrating =================================
-- change_table(:users)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

SQLite3::SQLException: no such table: users: ALTER TABLE "users" ADD "email" varchar DEFAULT '' NOT NULL
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:in `initialize'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:in `new'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:in `prepare'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:137:in `execute'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/sqlite3_adapter.rb:317:in `block in execute'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract_adapter.rb:484:in `block in log'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activesupport-4.2.7/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract_adapter.rb:478:in `log'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/sqlite3_adapter.rb:317:in `execute'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract/schema_statements.rb:407:in `add_column'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/sqlite3_adapter.rb:443:in `add_column'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract/schema_definitions.rb:573:in `block (3 levels) in <class:Table>'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract/schema_definitions.rb:572:in `each'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract/schema_definitions.rb:572:in `block (2 levels) in <class:Table>'
/Users/nishidaryu/RubymineProjects/share-tan/db/migrate/20170404082436_add_devise_to_users.rb:5:in `block in up'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract/schema_statements.rb:377:in `change_table'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:665:in `block in method_missing'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:634:in `block in say_with_time'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:634:in `say_with_time'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:654:in `method_missing'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:416:in `method_missing'
/Users/nishidaryu/RubymineProjects/share-tan/db/migrate/20170404082436_add_devise_to_users.rb:3:in `up'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:571:in `up'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:611:in `exec_migration'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:592:in `block (2 levels) in migrate'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:591:in `block in migrate'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:590:in `migrate'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:768:in `migrate'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:998:in `block in execute_migration_in_transaction'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:1044:in `block in ddl_transaction'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract/transaction.rb:184:in `within_new_transaction'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/transactions.rb:220:in `transaction'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:1044:in `ddl_transaction'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:997:in `execute_migration_in_transaction'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:959:in `block in migrate'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:955:in `each'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:955:in `migrate'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:823:in `up'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/migration.rb:801:in `migrate'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/tasks/database_tasks.rb:137:in `migrate'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such table: users: ALTER TABLE "users" ADD "email" varchar DEFAULT '' NOT NULL
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:in `initialize'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:in `new'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:in `prepare'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:137:in `execute'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/sqlite3_adapter.rb:317:in `block in execute'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract_adapter.rb:484:in `block in log'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activesupport-4.2.7/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract_adapter.rb:478:in `log'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/sqlite3_adapter.rb:317:in `execute'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract/schema_statements.rb:407:in `add_column'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/sqlite3_adapter.rb:443:in `add_column'
/Users/nishidaryu/RubymineProjects/share-tan/vendor/bundl/ruby/2.3.0/gems/activerecord-4.2.7/lib/active_record/connection_adapters/abstract/schema_definitions.rb:573:in `block (3 levels) in 

20170404082436_add_devise_to_users.rb

migrateファイルは正常に作成されてます。
回答よろしくお願いします。

Answer 1

usersのマイグレーションファイルが無いか、もしくは、マイグレーションの適用順番が悪く、usersテーブルの書き換えに失敗しているように見えます。
20170404082436_add_devise_to_users.rb を削除してやり直してはどうでしょうか。

Comments

[NishidaRyu416_]

usersのマイグレーションファイルが無いです
その場合どうすればいいですか？

[miyamiya]

20170404082436_add_devise_to_users.rb を削除して、
rake g devise userでcreate_usersのマイグレーションファイルができるはずです。
それでもだめなら、rails g scaffold Userのあとにrails g devise User
で作り直すのもありです。

[NishidaRyu416_]

rails g scaffold User やるとRunning via Spring preloader in process 51237
invoke active_record
The name 'User' is either already used in your application or reserved by Ruby on Rails. Please choose an alternative and run this generator again.
とのエラーでuser のmigration ファイルができません