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Sorceryでのマイグレーションファイルが作成されない

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問題

なぜかSorceryのサイトの通り下記のように入力してもマイグレーションファイルが生成されない。
>>https://github.com/Sorcery/sorcery/wiki/Simple-Password-Authentication

$ rails g sorcery:install
$ rails g sorcery:install external --only-submodules

解決

GemfileのSorceryに関する記述を一時的に1から2に変更し「bundle install」

1.gem 'sorcery', '~> 0.12.0'
2.gem 'sorcery', github: 'sorcery/sorcery'

2.の状態で先のコマンドを実行するとマイグレーションファイルが生成される。
その後Gemfileを1.の状態に戻す。

教えてください

根本的な問題がよくわかりません。ご存知の方がいらしたら教えてください。
お願いします。

Takka_Log
Ruby/Ruby On Rails初心者です。
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