bundle install したときに mysql2 のところでエラーが出ました。
DS-MacBook-Air:rails_app daichisaito$ 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 for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`. Fetching gem metadata from httpss://rubygems.org/............. Fetching gem metadata from httpss://rubygems.org/.. Resolving dependencies... Using rake 12.3.1 Using concurrent-ruby 1.0.5 Using minitest 5.11.3 Using thread_safe 0.3.6 Using mini_portile2 2.3.0 Using crass 1.0.4 Using rack 2.0.4 Using nio4r 2.3.0 Using websocket-extensions 0.1.3 Using mini_mime 1.0.0 Using arel 9.0.0 Using mimemagic 0.3.2 Using erubi 1.7.1 Using builder 3.2.3 Using bundler 1.16.1 Fetching byebug 10.0.2 Fetching bindex 0.5.0 Fetching msgpack 1.2.4 Installing bindex 0.5.0 with native extensions Installing msgpack 1.2.4 with native extensions Installing byebug 10.0.2 with native extensions Fetching execjs 2.7.0 Installing execjs 2.7.0 Fetching ffi 1.9.23 Installing ffi 1.9.23 with native extensions Fetching multi_json 1.13.1 Installing multi_json 1.13.1 Fetching rb-fsevent 0.10.3 Installing rb-fsevent 0.10.3 Fetching ruby_dep 1.5.0 Installing ruby_dep 1.5.0 Using method_source 0.9.0 Fetching mysql2 0.5.1 Installing mysql2 0.5.1 with native extensions Fetching puma 3.11.4 Installing puma 3.11.4 with native extensions Using thor 0.20.0 Fetching tilt 2.0.8 Installing tilt 2.0.8 Using i18n 1.0.0 Using tzinfo 1.2.5 Using nokogiri 1.8.2 Using rack-test 1.0.0 Using sprockets 3.7.1 Using websocket-driver 0.7.0 Using mail 2.7.0 Using marcel 0.3.2 Fetching uglifier 4.1.9 Installing uglifier 4.1.9 Fetching bootsnap 1.3.0 Installing bootsnap 1.3.0 with native extensions Fetching rb-inotify 0.9.10 Installing rb-inotify 0.9.10 Using activesupport 5.2.0 Using loofah 2.2.2 Fetching listen 3.1.5 Installing listen 3.1.5 Fetching sass-listen 4.0.0 Installing sass-listen 4.0.0 Using rails-dom-testing 2.0.3 Using rails-html-sanitizer 1.0.4 Using globalid 0.4.1 Using activemodel 5.2.0 Fetching jbuilder 2.7.0 Installing jbuilder 2.7.0 Fetching spring 2.0.2 Fetching sass 3.5.6 Using actionview 5.2.0 Using activejob 5.2.0 Using activerecord 5.2.0 Using actionpack 5.2.0 Using actioncable 5.2.0 Using actionmailer 5.2.0 Using activestorage 5.2.0 Using railties 5.2.0 Using sprockets-rails 3.2.1 Using rails 5.2.0 Fetching web-console 3.6.0 Installing spring 2.0.2 Installing web-console 3.6.0 Installing sass 3.5.6 Gem::Ext::BuildError: ERROR: Failed to build gem native extension. current directory: /Users/daichisaito/Developing/RubyPractice/rails_app/vendor/bundle/ruby/2.5.0/gems/mysql2-0.5.1/ext/mysql2 /Users/daichisaito/.rbenv/versions/2.5.0/bin/ruby -r ./siteconf20180415-39191-n8pajt.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/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/Cellar/mysql/5.7.18_1/lib ----- creating Makefile current directory: /Users/daichisaito/Developing/RubyPractice/rails_app/vendor/bundle/ruby/2.5.0/gems/mysql2-0.5.1/ext/mysql2 make "DESTDIR=" clean current directory: /Users/daichisaito/Developing/RubyPractice/rails_app/vendor/bundle/ruby/2.5.0/gems/mysql2-0.5.1/ext/mysql2 make "DESTDIR=" compiling client.c 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/daichisaito/Developing/RubyPractice/rails_app/vendor/bundle/ruby/2.5.0/gems/mysql2-0.5.1 for inspection. Results logged to /Users/daichisaito/Developing/RubyPractice/rails_app/vendor/bundle/ruby/2.5.0/extensions/x86_64-darwin-16/2.5.0-static/mysql2-0.5.1/gem_make.out An error occurred while installing mysql2 (0.5.1), and Bundler cannot continue. Make sure that `gem install mysql2 -v '0.5.1'` succeeds before bundling. In Gemfile: mysql2
こちらを参考にしました。
https://qiita.com/akito19/items/e1dc54f907987e688cc0
$ bundle config --local build.mysql2 "--with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include" $ bundle install
で成功。