
% rails db:create
rails aborted!
LoadError: cannot load such file -- mimemagic
/projects/〜〜〜/config/application.rb:7:in `<main>'
/projects/〜〜〜/Rakefile:4:in `<main>'
bin/rails:4:in `<main>'

git hubからとあるファイルをcloneしdb:createをした際に生じたエラー

まいむまじっく.......???
なかなかマイナーなファイルが原因を引き起こしてるっぽいけども・・・

ひとりでは解決困難！！先輩の力を借りてる最中、Qiitaをみてみるとこんな記事が

a.com/zQmjRAb73seN5RM/items/5fa74d2a4d346cdd386e

バージョンの問題っぽい・・・？
その通りにコマンドを実行してみた

＄gem list 〇〇 
//〇〇には該当ファイルを入れる(今回だとmimemagic)

結果は......

mimemagic (default: 0.3.5, 0.3.4, 0.3.3)

ではどんなファイルがあるのかを確認してみる

find ~/.rbenv -type f | grep 〇〇
//〇〇には該当ファイルを入れる(今回だとmimemagic)

結果は......

(一部抜粋)
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/test/files/image.png
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/test/files/application.zip
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/CHANGELOG.md
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/script/freedesktop.org.xml
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/script/generate-mime.rb
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/README.md
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/Rakefile
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/mimemagic.gemspec
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/.gitignore
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/lib/mimemagic/tables.rb
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/lib/mimemagic/version.rb
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/lib/mimemagic/overlay.rb
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/lib/mimemagic.rb
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/Gemfile
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/.travis.yml
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/.yardopts
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/LICENSE
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/test/mimemagic_test.rb
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/test/files/application.vnd.openxmlformats-officedocument.spreadsheetml{gdocs}.sheet
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/test/files/application.x-tar
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/test/files/application.gzip
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/test/files/application.x-bzip
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/test/files/application.vnd.openxmlformats-officedocument.spreadsheetml{msoffice}.sheet
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/test/files/image.jpeg
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/test/files/application.x-ruby
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/test/files/image.png
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/test/files/application.vnd.openxmlformats-officedocument.spreadsheetml{rubyxl}.sheet
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/test/files/application.zip
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/CHANGELOG.md
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/script/freedesktop.org.xml
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/script/generate-mime.rb/Users/tech-camp/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/test/files/image.png
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/test/files/application.zip
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/CHANGELOG.md/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/script/freedesktop.org.xml
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/script/generate-mime.rb
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/README.md
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/Rakefile
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/mimemagic.gemspec
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/.gitignore
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/lib/mimemagic/tables.rb
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/lib/mimemagic/version.rb
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/lib/mimemagic/overlay.rb
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/lib/mimemagic.rb
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/Gemfile
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.3/.travis.yml
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/.yardopts
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/LICENSE
/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/mimemagic-0.3.4/test/mimemagic_test.rb

みてみると 0.3.3 0.3.4のファイルはあることになっているが、0.3.5がないとのこと
ここが食い違っているから生じたエラー is 濃厚......
この食い違いを解決するには、

% gem install mimemagic -v 0.3.5

結果

Successfully installed mimemagic-0.3.5

そして畳みかけます

% bundle install    
% rails db:create

成功！！！！！！！

LoadErrorのさいはぜひ参考にしてみてください！