在RubyMine中无法在Rails 4.1.5中使用mysql2 gem

Question

我正在尝试使用带有Rails的mysql 2 gem，所以我添加了gem 'mysql2' 。 我无法使用bundle install安装它，它给了我这个错误。

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /Users/Ben/.rvm/rubies/ruby-2.2.0/bin/ruby -r ./siteconf20150307-17143-1jx7cob.rb extconf.rb 
checking for ruby/thread.h... yes
checking for rb_thread_call_without_gvl() in ruby/thread.h... yes
checking for rb_thread_blocking_region()... no
checking for rb_wait_for_single_fd()... yes
checking for rb_hash_dup()... yes
checking for rb_intern3()... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lm... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lz... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lsocket... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lnsl... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lmygcc... no
checking for mysql_query() in -lmysqlclient... no
*** 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
        --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=/Users/Ben/.rvm/rubies/ruby-2.2.0/bin/$(RUBY_BASE_NAME)
        --with-mysql-dir
        --without-mysql-dir
        --with-mysql-include
        --without-mysql-include=${mysql-dir}/include
        --with-mysql-lib
        --without-mysql-lib=${mysql-dir}/lib
        --with-mysql-config
        --without-mysql-config
        --with-mysql-dir
        --without-mysql-dir
        --with-mysql-include
        --without-mysql-include=${mysql-dir}/include
        --with-mysql-lib
        --without-mysql-lib=${mysql-dir}/lib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-mlib
        --without-mlib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-zlib
        --without-zlib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-socketlib
        --without-socketlib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-nsllib
        --without-nsllib
        --with-mysqlclientlib
        --without-mysqlclientlib
        --with-mygcclib
        --without-mygcclib
        --with-mysqlclientlib
        --without-mysqlclientlib

extconf failed, exit code 1

Gem files will remain installed in /Users/Ben/.rvm/gems/ruby-2.2.0/gems/mysql2-0.3.18 for inspection.
Results logged to /Users/Ben/.rvm/gems/ruby-2.2.0/extensions/x86_64-darwin-14/2.2.0/mysql2-0.3.18/gem_make.out
An error occurred while installing mysql2 (0.3.18), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.18'` succeeds before bundling.

我不知道如何让它工作，所以任何帮助将不胜感激。

这是我的电脑上的一些信息。 ruby -v => ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]

gem 'rails', '4.1.5' （rails -v不起作用）

bundler -v => Bundler version 1.8.4

操作系统：Mac Yosemite

Answer 1

对于Mac用户：

brew install mysql
gem install mysql2

---

对于Ubuntu用户：

sudo apt-get install mysql-server mysql-client libmysqlclient-dev
sudo gem install mysql2

安装libmysqlclient-dev为您提供了编译mysql2 gem所需的文件，这是Rails在您设置Rails应用程序时将用于连接MySQL的内容。

---

最后，运行bundle install

Answer 2

尝试先安装'libmysqlclient-dev'

sudo apt-get install libmysqlclient-dev

然后跑

bundle install

Answer 3

我想出了我的问题，我在RubyMine中运行rails server ，但由于某种原因，RM使用旧版本的ruby。 改变项目的sdks工作得很好！

Answer 4

确保使用bundler安装宝石。

跑

bundle install

或者干脆

gem install mysql2

然后将它包含在database.yml文件中

Answer 5

不是OS特定的答案，但可能有助于其他人：

较新的MySQL2适配器（v0.4.x）与Rails 4.1.5不兼容。 指定一个较旧的mysql2 gem（例如v0.3.x）可以解决这个问题：

gem 'mysql2', '~> 0.3.21'

资料来源： https ： //github.com/brianmario/mysql2/issues/675