Q&A
MySQLが正しくインストールできて動作していることを確認してください。
rails s以前に、railsアプリのインストール(rails new)がエラーなく実行できたか確認してください。
rails s後、localgost:3000にアクセスするとLoadErrorが発生します。
色々調べてみたのですが、解決せずどなたかご教示いただけると幸いです。
やったこと
・gemの再インストール
・bundle update
エラー分は以下となります。
2020-07-07 23:51:30 +0900: Rack app error handling request { GET / } #<LoadError: Error loading the 'mysql2' Active Record adapter. Missing a gem it depends on? cannot load such file -- /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.4.2/lib/active_record/connection_adapters/mysql/column.rb> /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `block in require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:257:in `load_dependency' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.4.2/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:5:in `<main>' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `block in require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:257:in `load_dependency' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.4.2/lib/active_record/connection_adapters/mysql2_adapter.rb:3:in `<main>' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `block in require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:257:in `load_dependency' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.4.2/lib/active_record/connection_adapters/connection_specification.rb:191:in `spec' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.4.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:975:in `establish_connection' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.4.2/lib/active_record/connection_handling.rb:60:in `establish_connection' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.4.2/lib/active_record/railtie.rb:136:in `block (2 levels) in <class:Railtie>' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/lazy_load_hooks.rb:71:in `instance_eval' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/lazy_load_hooks.rb:71:in `block in execute_hook' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/lazy_load_hooks.rb:62:in `with_execution_control' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/lazy_load_hooks.rb:67:in `execute_hook' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/lazy_load_hooks.rb:52:in `block in run_load_hooks' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/lazy_load_hooks.rb:51:in `each' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/lazy_load_hooks.rb:51:in `run_load_hooks' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.4.2/lib/active_record/base.rb:328:in `<module:ActiveRecord>' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.4.2/lib/active_record/base.rb:27:in `<main>' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `block in require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:257:in `load_dependency' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `require' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activerecord-5.2.4.2/lib/active_record/query_cache.rb:29:in `run' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/execution_wrapper.rb:27:in `before' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/callbacks.rb:426:in `block in make_lambda' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/callbacks.rb:198:in `block (2 levels) in halting' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/callbacks.rb:606:in `block (2 levels) in default_terminator' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/callbacks.rb:605:in `catch' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/callbacks.rb:605:in `block in default_terminator' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/callbacks.rb:199:in `block in halting' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/callbacks.rb:513:in `block in invoke_before' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/callbacks.rb:513:in `each' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/callbacks.rb:513:in `invoke_before' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/callbacks.rb:131:in `run_callbacks' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/execution_wrapper.rb:110:in `run!' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/execution_wrapper.rb:72:in `block in run!' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/execution_wrapper.rb:69:in `tap' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.2/lib/active_support/execution_wrapper.rb:69:in `run!' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.4.2/lib/action_dispatch/middleware/executor.rb:12:in `call' /Users/ユーザ名/Taskun/vendor/bundle/ruby/2.6.0/gems/actionpack-5.2.4.2/lib/action_dispatch/middleware/static.rb:127:in `call'
よろしくお願い致します。
$ which mysql
$ mysql --version
を実行してみて何が表示されるか、ですね～
technocoreさん
mysql --versionの結果は【mysql Ver 14.14 Distrib 5.7.29, for osx10.15 (x86_64) using EditLine wrapper】
rails newはmysql2でエラーとなりました。
下記エラー文です。
An error occurred while installing mysql2 (0.5.3), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.5.3' --source 'https://rubygems.org/'` succeeds before bundling.
In Gemfile:
mysql2
run bundle binstubs bundler
Could not find gem 'rails (~> 6.0.3)' in any of the gem sources listed in your Gemfile.
run bundle exec spring binstub --all
Could not find gem 'rails (~> 6.0.3)' in any of the gem sources listed in your Gemfile.
Run `bundle install` to install missing gems.
rails webpacker:install
Could not find gem 'rails (~> 6.0.3)' in any of the gem sources listed in your Gemfile.
Run `bundle install` to install missing gems.
gem install mysql2 -v '0.5.3' --source 'https://rubygems.org/'をしましたがこれもエラーがでました。
Failed to load /Users/kawasetakuya/.gemrc because it doesn't contain valid YAML hash
Building native extensions. This could take a while...
ERROR: Error installing mysql2:
ERROR: Failed to build gem native extension.
current directory: /Users/kawasetakuya/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3/ext/mysql2
/Users/kawasetakuya/.rbenv/versions/2.7.0/bin/ruby -I /Users/kawasetakuya/.rbenv/versions/2.7.0/lib/ruby/2.7.0 -r ./siteconf20200708-57566-1hw8z5g.rb extconf.rb
checking for rb_absint_size()... yes
checking for rb_absint_singlebit_p()... yes
checking for rb_wait_for_single_fd()... yes
-----
Using mysql_config at /usr/local/opt/mysql@5.7/bin/mysql_config
-----
checking for mysql.h... yes
checking for errmsg.h... yes
checking for SSL_MODE_DISABLED in mysql.h... yes
checking for SSL_MODE_PREFERRED in mysql.h... yes
checking for SSL_MODE_REQUIRED in mysql.h... yes
checking for SSL_MODE_VERIFY_CA in mysql.h... yes
checking for SSL_MODE_VERIFY_IDENTITY in mysql.h... yes
checking for MYSQL.net.vio in mysql.h... yes
checking for MYSQL.net.pvio in mysql.h... no
checking for MYSQL_ENABLE_CLEARTEXT_PLUGIN in mysql.h... yes
checking for SERVER_QUERY_NO_GOOD_INDEX_USED in mysql.h... yes
checking for SERVER_QUERY_NO_INDEX_USED in mysql.h... yes
checking for SERVER_QUERY_WAS_SLOW in mysql.h... yes
checking for MYSQL_OPTION_MULTI_STATEMENTS_ON in mysql.h... yes
checking for MYSQL_OPTION_MULTI_STATEMENTS_OFF in mysql.h... yes
checking for my_bool in mysql.h... yes
-----
Don't know how to set rpath on your system, if MySQL libraries are not in path mysql2 may not load
-----
-----
Setting libpath to /usr/local/opt/mysql@5.7/lib
-----
creating Makefile
current directory: /Users/kawasetakuya/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3/ext/mysql2
make "DESTDIR=" clean
current directory: /Users/kawasetakuya/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3/ext/mysql2
make "DESTDIR="
compiling client.c
client.c:787:14: warning: incompatible pointer types passing 'VALUE (void *)' (aka 'unsigned long (void *)') to parameter of type 'VALUE (*)(VALUE)' (aka 'unsigned long (*)(unsigned long)') [-Wincompatible-pointer-types]
rb_rescue2(do_send_query, (VALUE)&args, disconnect_and_raise, self, rb_eException, (VALUE)0);
^~~~~~~~~~~~~
/Users/kawasetakuya/.rbenv/versions/2.7.0/include/ruby-2.7.0/ruby/ruby.h:1988:25: note: passing argument to parameter here
VALUE rb_rescue2(VALUE(*)(VALUE),VALUE,VALUE(*)(VALUE,VALUE),VALUE,...);
^
client.c:795:16: warning: incompatible pointer types passing 'VALUE (void *)' (aka 'unsigned long (void *)') to parameter of type 'VALUE (*)(VALUE)' (aka 'unsigned long (*)(unsigned long)') [-Wincompatible-pointer-types]
rb_rescue2(do_query, (VALUE)&async_args, disconnect_and_raise, self, rb_eException, (VALUE)0);
^~~~~~~~
/Users/kawasetakuya/.rbenv/versions/2.7.0/include/ruby-2.7.0/ruby/ruby.h:1988:25: note: passing argument to parameter here
VALUE rb_rescue2(VALUE(*)(VALUE),VALUE,VALUE(*)(VALUE,VALUE),VALUE,...);
^
2 warnings generated.
compiling infile.c
compiling mysql2_ext.c
compiling result.c
compiling statement.c
linking shared-object mysql2/mysql2.bundle
ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [mysql2.bundle] Error 1
make failed, exit code 2
Gem files will remain installed in /Users/kawasetakuya/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/mysql2-0.5.3 for inspection.
Results logged to /Users/kawasetakuya/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/extensions/x86_64-darwin-19/2.7.0/mysql2-0.5.3/gem_make.out
ながながとエラー文を申し訳ありません。
どこが必要なのかもわからず…
siruku6さん
$which mysql → /usr/local/opt/mysql@5.7/bin/mysql
＄mysql --version → mysql Ver 14.14 Distrib 5.7.29, for osx10.15 (x86_64) using EditLine wrapper
上記のようになります。
おかしい箇所はありますでしょうか？
自己解決
