Could not find gem 'pg-v (~> 1.2.3)' in any of the gem sources listed in your Gemfile.

Question

bunlde installコマンドを実行した後このようなエラーが出たのですがどうしたら良いでしょうか？
エラーコード通りに　'pg-v (~> 1.2.3'をgemfileにかきインストールしようとしても以下のエラーコードが出てしまいます。

[!] There was an error parsing `Gemfile`: 'pg -v' is not a valid gem name because it contains whitespace. Bundler cannot continue.

 #  from /home/rails/sample/Gemfile:55
 #  -------------------------------------------
 #      gem 'mysql2'
 >      gem 'pg -v', '~> 1.2.3'
 #  end
 #  -------------------------------------------

Answer 1

こちらでもpgをインストールしてみましたが問題なかったです。
インストール手順を見直してみてください。

# Use mysql as the database for Active Record
gem 'mysql2', '>= 0.4.4', '< 0.6.0'
 
gem 'pg'
 
# Use Puma as the app server
gem 'puma', '~> 3.11'

$ bundle install

途中省略
Using mysql2 0.5.3
Fetching pg 1.2.3
Installing pg 1.2.3 with native extensions
Using puma 3.12.6
途中省略

Comments

[atage517]

わかりました！もう一度最初からやり直してみます！ありがとうございまいした

Answer 2

vi Gemfile

でGemfileを開き、'pg', '~>1.2.3'をコメントアウト することで無事にインストールできました

Answer 3

pg-vというGemは無いですね。

$ gem search pg-v

*** REMOTE GEMS ***
pg-vacuum-monitor (0.2.0)
pg-vacuum-monitor-job (0.2.2)

pgというGemならありますが。。。

$ gem search pg

*** REMOTE GEMS ***
途中省略
pg (1.2.3 ruby x64-mingw32 x86-mingw32, 0.11.0 x86-mswin32, 0.8.0 x86-mswin32-60)
途中省略

Comments

[atage517]

ありがとうございます

gem install pgを実行したところ以下のコードが出てきてしまいます。

Building native extensions. This could take a while...
ERROR: Error installing pg:
ERROR: Failed to build gem native extension.

current directory: /usr/local/src/rbenv/versions/2.7.0-dev/lib/ruby/gems/2.8.0/gems/pg-1.2.3/ext
/usr/local/src/rbenv/versions/2.7.0-dev/bin/ruby -I /usr/local/src/rbenv/versions/2.7.0-dev/lib/ruby/2.8.0 -r ./siteconf20200621-2963-abn9np.rb extconf.rb
checking for pg_config... no
No pg_config... trying anyway. If building fails, please try again with
--with-pg-config=/path/to/pg_config
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.

Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/usr/local/src/rbenv/versions/2.7.0-dev/bin/$(RUBY_BASE_NAME)
--with-pg
--without-pg
--enable-windows-cross
--disable-windows-cross
--with-pg-config
--without-pg-config
--with-pg_config
--without-pg_config
--with-pg-dir
--without-pg-dir
--with-pg-include
--without-pg-include=${pg-dir}/include
--with-pg-lib
--without-pg-lib=${pg-dir}/lib

To see why this extension failed to compile, please check the mkmf.log which can be found here:

/usr/local/src/rbenv/versions/2.7.0-dev/lib/ruby/gems/2.8.0/extensions/x86_64-linux/2.8.0-static/pg-1.2.3/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /usr/local/src/rbenv/versions/2.7.0-dev/lib/ruby/gems/2.8.0/gems/pg-1.2.3 for inspection.
Results logged to /usr/local/src/rbenv/versions/2.7.0-dev/lib/ruby/gems/2.8.0/extensions/x86_64-linux/2.8.0-static/pg-1.2.3/gem_make.out
ERROR: Could not find a valid gem '1.2.3' (>= 0) in any repository