Ruby/Rails Advent Calendar 2025

28 participant

77 followers

86 likes

Category：Programming language

Creator：

@PDC-Kurashinak

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Ruby/Railsについての知見を共有しましょう！

Ruby, Ruby on Rails, PicoRubyなどの開発体験やちょっとした知識などの共有をするアドベントカレンダーです！

11/6,7でRuby World Conferenceもあることですし！

対象

Rubyを使った開発体験・Rubyについての知識の共有・Ruby on Railsを使った個人開発・趣味など
Rubyに関することならなんでも！！

内容例

面白いGemについての紹介
アンチパターンコードについて
Rails開発を行った時に学んだこと
Ruby World Conference 2025の参加レポート

など！

初心者から熟練者まで、誰でも大歓迎です。小ネタでも構いません。数行でも構いません。
たくさんの記事をお待ちしております！

How to join the calendar

You can join the calendar by selecting an available date and registering the URL of the article you wish to link to. If a slot is available, you can go back to a past date to join!

Series 1

Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
30	@tomoaki-kimura 子供たちにRubyを楽しく学んで貰いたく頑張った話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@hashimoto-kei PARENTHESIS_LEFT_PARENTHESES というトークン Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@hiroeorz@github Cloudflare WorkersでRubyを動かす。D1/Workers AI連携まで実現した俺得フレームワーク「Hibana」を作った話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@tmtms IO::Buffer Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@willnet@github rakeタスクはconfig.rake_eager_loadを設定しないと本番環境でもeager loadしない Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@shugo String#stripで削除される文字を指定できるようにする Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@t_mimura その404本当に「Not Found」ですか？ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@jnchito 【Rails】知ってた？name_wasやname_changed?は非推奨じゃないし、今でもふつうに使えるって！ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ktou IO::Bufferを使ったpure Ruby FlatBuffers処理系 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@gemmaro EmacsでTypeProf Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@goosys 10年の時を経てAdministrateがついにver.1になったけどまだ使わないでもらいたい話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@niku Marshal.loadのときに現れる謎のtrueがなんなのかわかった Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ykws Rubyコミュニティとの特に印象に残るPull Request Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@KaitoMuraoka 初心者なので、Rails内でよく使うRubyの話します Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@fibered_alto [Ruby] RedAmberの配列カラムをスキーマ明示で安全に扱う Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@fussy113 ActionMailerに、複数のメールを一括でエンキューするメソッドが追加された Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@sanfrecce-osaka 一行パターンマッチを使って nil を消すテクニック Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@znz irbで最終行以外でも実行したい Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@PDC-Kurashinak 【Rails】登録時にバリデーションに引っかかった時に、メッセージが2つ出てくる時に確認すべきところ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@tongararin 「知らず知らず使っていた<=>」 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@yuukago 【Rails初心者】疑問に思ったRailsメソッドを深掘りしてみた Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@udzura Rubyがエッジで動く日 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@maimux2x パターンマッチの右代入について書こうかなと思います(仮) Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@yasu-sg なんとか書く Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@hatsu ZennロゴのアスキーアートのプログラムでMerryChristmasを出力する Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@tomoaki-kimura
子供たちにRubyを楽しく学んで貰いたく頑張った話
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@hashimoto-kei
PARENTHESIS_LEFT_PARENTHESES というトークン
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@hiroeorz@github
Cloudflare WorkersでRubyを動かす。D1/Workers AI連携まで実現した俺得フレームワーク「Hibana」を作った話
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@tmtms
IO::Buffer
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@willnet@github
rakeタスクはconfig.rake_eager_loadを設定しないと本番環境でもeager loadしない
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@shugo
String#stripで削除される文字を指定できるようにする
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@t_mimura
その404本当に「Not Found」ですか？
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@jnchito
【Rails】知ってた？name_wasやname_changed?は非推奨じゃないし、今でもふつうに使えるって！
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@ktou
IO::Bufferを使ったpure Ruby FlatBuffers処理系
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@gemmaro
EmacsでTypeProf
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@goosys
10年の時を経てAdministrateがついにver.1になったけどまだ使わないでもらいたい話
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@niku
Marshal.loadのときに現れる謎のtrueがなんなのかわかった
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@ykws
Rubyコミュニティとの特に印象に残るPull Request
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@KaitoMuraoka
初心者なので、Rails内でよく使うRubyの話します
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@fibered_alto
[Ruby] RedAmberの配列カラムをスキーマ明示で安全に扱う
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@fussy113
ActionMailerに、複数のメールを一括でエンキューするメソッドが追加された
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@sanfrecce-osaka
一行パターンマッチを使って nil を消すテクニック
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@znz
irbで最終行以外でも実行したい
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@PDC-Kurashinak
【Rails】登録時にバリデーションに引っかかった時に、メッセージが2つ出てくる時に確認すべきところ
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@tongararin
「知らず知らず使っていた<=>」
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@yuukago
【Rails初心者】疑問に思ったRailsメソッドを深掘りしてみた
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@udzura
Rubyがエッジで動く日
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@maimux2x
パターンマッチの右代入について書こうかなと思います(仮)
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@yasu-sg
なんとか書く
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@hatsu
ZennロゴのアスキーアートのプログラムでMerryChristmasを出力する
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Series 2

Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
30	@scivola もうすぐ出る Ruby の新バージョンが 4.0 てマ？ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@scivola Ruby 4 で組込みクラスになった Pathname と Set の gem は読み込めるか？ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@scivola Ruby で文字列の先頭・末尾のあらゆる空白文字を取り除く話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@scivola Ruby 4.0 の Ruby モジュールの定数 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@scivola Ruby 4.0 で Unicode 17.0 に対応した Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@scivola Ruby 4.0 で Thor タスクが死んだ話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@scivola Ruby クイズ：「通常のプログラムで発生する可能性の高い」例外だけど StandardError じゃないやつな〜んだ？ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 8 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 9 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 10 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 11 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 12 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 13 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
Join calendar on 14 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 15 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 16 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 17 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 18 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 19 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 20 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@sonota88 Ruby/DXOpalでSKKおためしアプリを作ってみた Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@Reichardt Rangeの共通部分（交差）を求めるメソッドが無かったので作った Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 23 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 24 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 25 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@scivola
もうすぐ出る Ruby の新バージョンが 4.0 てマ？
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@scivola
Ruby 4 で組込みクラスになった Pathname と Set の gem は読み込めるか？
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@scivola
Ruby で文字列の先頭・末尾のあらゆる空白文字を取り除く話
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@scivola
Ruby 4.0 の Ruby モジュールの定数
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@scivola
Ruby 4.0 で Unicode 17.0 に対応した
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@scivola
Ruby 4.0 で Thor タスクが死んだ話
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@scivola
Ruby クイズ：「通常のプログラムで発生する可能性の高い」例外だけど StandardError じゃないやつな〜んだ？
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@sonota88
Ruby/DXOpalでSKKおためしアプリを作ってみた
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@Reichardt
Rangeの共通部分（交差）を求めるメソッドが無かったので作った
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Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
30	@tomoaki-kimura 子供たちにRubyを楽しく学んで貰いたく頑張った話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@hashimoto-kei PARENTHESIS_LEFT_PARENTHESES というトークン Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@hiroeorz@github Cloudflare WorkersでRubyを動かす。D1/Workers AI連携まで実現した俺得フレームワーク「Hibana」を作った話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@tmtms IO::Buffer Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@willnet@github rakeタスクはconfig.rake_eager_loadを設定しないと本番環境でもeager loadしない Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@shugo String#stripで削除される文字を指定できるようにする Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@t_mimura その404本当に「Not Found」ですか？ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@jnchito 【Rails】知ってた？name_wasやname_changed?は非推奨じゃないし、今でもふつうに使えるって！ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ktou IO::Bufferを使ったpure Ruby FlatBuffers処理系 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@gemmaro EmacsでTypeProf Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@goosys 10年の時を経てAdministrateがついにver.1になったけどまだ使わないでもらいたい話 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@niku Marshal.loadのときに現れる謎のtrueがなんなのかわかった Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@ykws Rubyコミュニティとの特に印象に残るPull Request Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@KaitoMuraoka 初心者なので、Rails内でよく使うRubyの話します Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@fibered_alto [Ruby] RedAmberの配列カラムをスキーマ明示で安全に扱う Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@fussy113 ActionMailerに、複数のメールを一括でエンキューするメソッドが追加された Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@sanfrecce-osaka 一行パターンマッチを使って nil を消すテクニック Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@znz irbで最終行以外でも実行したい Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@PDC-Kurashinak 【Rails】登録時にバリデーションに引っかかった時に、メッセージが2つ出てくる時に確認すべきところ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@tongararin 「知らず知らず使っていた<=>」 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@yuukago 【Rails初心者】疑問に思ったRailsメソッドを深掘りしてみた Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@udzura Rubyがエッジで動く日 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@maimux2x パターンマッチの右代入について書こうかなと思います(仮) Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@yasu-sg なんとか書く Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@hatsu ZennロゴのアスキーアートのプログラムでMerryChristmasを出力する Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after October 31, 2025 can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	26	27

@tomoaki-kimura
子供たちにRubyを楽しく学んで貰いたく頑張った話
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@hashimoto-kei
PARENTHESIS_LEFT_PARENTHESES というトークン
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@hiroeorz@github
Cloudflare WorkersでRubyを動かす。D1/Workers AI連携まで実現した俺得フレームワーク「Hibana」を作った話
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@tmtms
IO::Buffer
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@willnet@github
rakeタスクはconfig.rake_eager_loadを設定しないと本番環境でもeager loadしない
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@shugo
String#stripで削除される文字を指定できるようにする
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@t_mimura
その404本当に「Not Found」ですか？
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@jnchito
【Rails】知ってた？name_wasやname_changed?は非推奨じゃないし、今でもふつうに使えるって！
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@ktou
IO::Bufferを使ったpure Ruby FlatBuffers処理系
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@gemmaro
EmacsでTypeProf
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@goosys
10年の時を経てAdministrateがついにver.1になったけどまだ使わないでもらいたい話
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@niku
Marshal.loadのときに現れる謎のtrueがなんなのかわかった
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@ykws
Rubyコミュニティとの特に印象に残るPull Request
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@KaitoMuraoka
初心者なので、Rails内でよく使うRubyの話します
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@fibered_alto
[Ruby] RedAmberの配列カラムをスキーマ明示で安全に扱う
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@fussy113
ActionMailerに、複数のメールを一括でエンキューするメソッドが追加された
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@sanfrecce-osaka
一行パターンマッチを使って nil を消すテクニック
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@znz
irbで最終行以外でも実行したい
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@PDC-Kurashinak
【Rails】登録時にバリデーションに引っかかった時に、メッセージが2つ出てくる時に確認すべきところ
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@tongararin
「知らず知らず使っていた<=>」
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@yuukago
【Rails初心者】疑問に思ったRailsメソッドを深掘りしてみた
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@udzura
Rubyがエッジで動く日
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@maimux2x
パターンマッチの右代入について書こうかなと思います(仮)
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@yasu-sg
なんとか書く
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@hatsu
ZennロゴのアスキーアートのプログラムでMerryChristmasを出力する
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You can increase the number of series when Calendar 2 is filled with more than 10 articles.

Ruby/Rails Advent Calendar 2025

Ruby/Railsについての知見を共有しましょう！

対象

内容例

edit_calendarHow to join the calendar

Series 1

How to join the calendar