Ruby On Rails：尝试启动 WEBrick 时出现错误消息

Question

I'm a TOTAL NEWBIE trying to learn Rails from a Lynda.com Ruby on Rails tutorial. I've got Rails 3.0 installed and Ruby Germs 1.8. Up to this point in the tutorial, I have created a Rails project and we are just about to access it. The tutor says that I should be able to type

rails server

in the terminal on a mac to boot up WEBrick which comes installed with Rails.

However, when I do it, I got the error message below (which I can't make sense of). **Do you know what I can do to get WEBrick working?

Note: I have mysql installed locally (/usr/local/mysql/bin/mysql) and it is running. I also have MAMP installed but it is not running (I only use it for PHP applications). I would also like to use mysql and WEBrick so that I can work along with the tutorial, but if there's an alternative solution that you can think of please also let me know...

/Library/Ruby/Gems/1.8/gems/mysql2-0.3.2/lib/mysql2/mysql2.bundle: dlopen(/Library/Ruby/Gems/1.8/gems/mysql2-0.3.2/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.18.dylib (LoadError)
  Referenced from: /Library/Ruby/Gems/1.8/gems/mysql2-0.3.2/lib/mysql2/mysql2.bundle
  Reason: image not found - /Library/Ruby/Gems/1.8/gems/mysql2-0.3.2/lib/mysql2/mysql2.bundle
    from /Library/Ruby/Gems/1.8/gems/mysql2-0.3.2/lib/mysql2.rb:8
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.14/lib/bundler/runtime.rb:68:in `require'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.14/lib/bundler/runtime.rb:68:in `require'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.14/lib/bundler/runtime.rb:66:in `each'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.14/lib/bundler/runtime.rb:66:in `require'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.14/lib/bundler/runtime.rb:55:in `each'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.14/lib/bundler/runtime.rb:55:in `require'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.14/lib/bundler.rb:120:in `require'
    from /Users/michaelmitchell/Sites/simple_cms/config/application.rb:7
    from /Library/Ruby/Gems/1.8/gems/railties-3.0.7/lib/rails/commands.rb:28:in `require'
    from /Library/Ruby/Gems/1.8/gems/railties-3.0.7/lib/rails/commands.rb:28
    from /Library/Ruby/Gems/1.8/gems/railties-3.0.7/lib/rails/commands.rb:27:in `tap'
    from /Library/Ruby/Gems/1.8/gems/railties-3.0.7/lib/rails/commands.rb:27
    from script/rails:6:in `require'
    from script/rails:6

UPDATE I tried a reinstall of mysql2 like this

sudo gem install mysql2 — –with-mysql-configs=/usr/local/mysql/bin/mysql_config

error message

Building native extensions.  This could take a while...
Successfully installed mysql2-0.3.6
ERROR:  Could not find a valid gem '—' (>= 0) in any repository
ERROR:  Could not find a valid gem '–with-mysql-configs=/usr/local/mysql/bin/mysql_config' (>= 0) in any repository
1 gem installed
Installing ri documentation for mysql2-0.3.6...

Enclosing class/module 'mMysql2' for class Client not known

Enclosing class/module 'mMysql2' for class Result not known
Installing RDoc documentation for mysql2-0.3.6...

Enclosing class/module 'mMysql2' for class Client not known

Enclosing class/module 'mMysql2' for class Result not known

Answer 1

I had the same problem and the comments above doesn't relate to your mistake. What the video didn't make you do was cd back to simple_cms . You were trying to execute the rails server command in the Sites folder (thats where the video leaves you) which is impossible. Make sure you cd back to simple_cms and do rails server.

Answer 2

try this out:

cd /Applications/MAMP/Library/lib/mysql/
ln -s  ibmysqlclient.la ibmysqlclient.a
ln -s libmysqlclient_r.la libmysqlclient_r.a
ln -s libndbclient.la libndbclient.a

sudo gem install mysql2 — –with-mysql-configs=/Applications/MAMP/Library/bin/mysql_config