Hello Worldプログラムを作ってみる
■environmentディレクトリ作成
練習プログラムはホームディレクトリ配下のenvironmentディレクトリに作成することとする。ということでディレクトリを作成し移動
cd
mkdir environment
cd environment/
mkdir environment
cd environment/
(base) users-iMac:~ user$ cd (base) users-iMac:~ user$ mkdir environment (base) users-iMac:~ user$ cd environment/ (base) users-iMac:environment user$
■プロジェクト作成
rails 5.1.6 で hello_app アプリを作成するcd ~/environment
rails _5.1.6_ new hello_app
rails _5.1.6_ new hello_app
(base) users-iMac:environment user$ cd ~/environment
(base) users-iMac:environment user$ rails _5.1.6_ new hello_app
create
create README.md
：
* For more details, please refer to the Sass blog:
http://sass.logdown.com/posts/7081811
run bundle exec spring binstub --all
* bin/rake: spring inserted
* bin/rails: spring inserted■Gemfile置換
~/environment/hello_app/Gemfileファイルを参考サイトの内容で置換する。
これは、チュートリアルがうまく動くようにバージョン指定を行っているらしい。
以下内容を張り付ける。
source 'https://rubygems.org' gem 'rails', '5.1.6' gem 'puma', '3.9.1' gem 'sass-rails', '5.0.6' gem 'uglifier', '3.2.0' gem 'coffee-rails', '4.2.2' gem 'jquery-rails', '4.3.1' gem 'turbolinks', '5.0.1' gem 'jbuilder', '2.6.4' group :development, :test do gem 'sqlite3', '1.3.13' gem 'byebug', '9.0.6', platform: :mri end group :development do gem 'web-console', '3.5.1' gem 'listen', '3.1.5' gem 'spring', '2.0.2' gem 'spring-watcher-listen', '2.0.1' end # Windows環境ではtzinfo-dataというgemを含める必要があります gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
修正したらgemをインストール
※ gem … ライブラリのことらしい
※ bundle … gemの管理プログラムのことらしい
cd ~/environment/hello_app/
bundle install
bundle install
(base) users-iMac:environment user$ cd ~/environment/hello_app (base) users-iMac:hello_app user$ bundle install [!] There was an error parsing `Gemfile`: Illformed requirement ["9,0.6"]. Bundl er cannot continue. # from /Users/user/environment/hello_app/Gemfile:14 # ------------------------------------------- # gem 'sqlite3', '1.3.13' > gem 'byebug', '9,0.6', platform: :mri # end # -------------------------------------------
パンチミスしていた "9,0.6" → "9.0.6"
もう一度実行
(base) users-iMac:hello_app user$ bundle install The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only fo r x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bun dle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`. Fetching gem metadata from https://rubygems.org/.......... Fetching gem metadata from https://rubygems.org/. Could not find gem 'jquery-rais (= 4.3.1)' in any of the gem sources listed in your Gemfile.
→ 今度はOKかな？
これでプログラムは完成とのこと。
rainsには簡易webサーバ機能があり結果を確認できる。
パスがhello_appにあることを確認して以下コマンドを実行
rails server
(base) users-iMac:hello_app user$ pwd /Users/user/environment/hello_app (base) users-iMac:hello_app user$ rails server Could not find gem 'puma (= 3.9.1)' in any of the gem sources listed in your Gem file. Run `bundle install` to install missing gems.
→ pumaが無いって言っている？
pumaはweサーバーっぽい。
gem listで確認
(base) users-iMac:hello_app user$ gem list *** LOCAL GEMS *** actioncable (5.2.2, 5.1.6.1, 5.1.6) : puma (3.12.0) :puma
ありました。でも3.12.0？
いったん削除する。
gem uninstall puma
(base) users-iMac:hello_app user$ gem uninstall puma
Remove executables:
puma, pumactl
in addition to the gem? [Yn] y
Removing puma
Removing pumactl
Successfully uninstalled puma-3.12.03.9.1をインストール
gem install puma -v 3.9.1
(base) users-iMac:hello_app user$ gem install puma -v 3.9.1 Fetching puma-3.9.1.gem Building native extensions. This could take a while... Successfully installed puma-3.9.1 Parsing documentation for puma-3.9.1 Installing ri documentation for puma-3.9.1 Done installing documentation for puma after 12 seconds 1 gem installed
念のため gem list で再確認。
(base) users-iMac:hello_app user$ gem list : puma (3.9.1) :
あらためて rails server
(base) users-iMac:hello_app user$ rails server Could not find gem 'sass-rails (= 5.0.6)' in any of the gem sources listed in yo ur Gemfile. Run `bundle install` to install missing gems.
→ 同じ原因っぽい。
※ sass-rails = CSS生成言語？
5.0.7が入っていたのでアンインストール→5.0.6インストール
(base) users-iMac:hello_app user$ gem uninstall sass-rails Successfully uninstalled sass-rails-5.0.7 (base) users-iMac:hello_app user$ gem install sass-rails -v 5.0.6 Fetching sass-rails-5.0.6.gem Successfully installed sass-rails-5.0.6 Parsing documentation for sass-rails-5.0.6 Installing ri documentation for sass-rails-5.0.6 Done installing documentation for sass-rails after 0 seconds 1 gem installed
gem server
(base) users-iMac:hello_app user$ rails server Could not find gem 'uglifier (= 3.2.0)' in any of the gem sources listed in your Gemfile. Run `bundle install` to install missing gems.※ uglifier = UglifyJS2というJavaScriptのRuby版？
4.1.20が入っていたのでアンインストール→3.2.0インストール
(base) users-iMac:hello_app user$ gem uninstall uglifier Successfully uninstalled uglifier-4.1.20 (base) users-iMac:hello_app user$ gem install uglifier -v 3.2.0 Fetching uglifier-3.2.0.gem Successfully installed uglifier-3.2.0 Parsing documentation for uglifier-3.2.0 Installing ri documentation for uglifier-3.2.0 Done installing documentation for uglifier after 2 seconds 1 gem installed
gem server
(base) users-iMac:hello_app user$ gem server Server started at http://[::]:8808 Server started at http://0.0.0.0:8808→ いけた？
ブラウザで http://192.168.56.101:8808 を開いてみる。
なんか違うような…
→ environmentフォルダを削除し始めからやり直してみる。
→ bundle install をやってみたが…
(base) users-iMac:hello_app user$ bundle install
The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler
is installing for. Bundler is installing for ruby but the dependency is only fo
r x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bun
dle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
Fetching gem metadata from https://rubygems.org/..........
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies...
Bundler could not find compatible versions for gem "activesupport":
In snapshot (Gemfile.lock):
activesupport (= 5.1.6.1)
In Gemfile:
rails (= 5.1.6) was resolved to 5.1.6, which depends on
activesupport (= 5.1.6)
coffee-rails (= 4.2.2) was resolved to 4.2.2, which depends on
railties (>= 4.0.0) was resolved to 5.1.6.1, which depends on
activesupport (= 5.1.6.1)
Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.→ …
[Ruby]
https://railstutorial.jp/chapters/beginning?version=5.1#sec-installing_rails
https://railstutorial.jp/chapters/beginning?version=5.1#sec-installing_rails
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