回答編集履歴
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追記
test
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```db/development.db```となっているところを```db/development.sqlite3```と変えてみてください。
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では```db/development.db```となっているところを```db/development.sqlite3```と変えてみてください。
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####追記
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cloud9でrails new testと実行して自動で出来たdatabase.ymlです。
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```ruby
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# SQLite version 3.x
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# gem install sqlite3
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#
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# Ensure the SQLite 3 gem is defined in your Gemfile
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# gem 'sqlite3'
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#
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default: &default
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adapter: sqlite3
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pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
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timeout: 5000
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development:
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<<: *default
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database: db/development.sqlite3
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# Warning: The database defined as "test" will be erased and
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# re-generated from your development database when you run "rake".
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# Do not set this db to the same as development or production.
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test:
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<<: *default
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database: db/test.sqlite3
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production:
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<<: *default
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database: db/production.sqlite3
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```
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こんな感じで中身がはいってないですか？
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入ってない場合はこのコードをコピーしてdatabase.ymlの中身を入れ替えてやってみてください。
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自分はこれでrake db:migrate:resetが動きました。
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