Ruby On Rails 3和Webrick问题

Question

Thanks for taking a look at this.

I started a beginner's tutorial on RoR through lynda.com. I followed the instructions to the letter. Everything was working so far until I got to accessing Webrick. When I typed in "rails server" to begin work, I got this error message below.

/Library/Ruby/Gems/1.8/gems/mysql2-0.2.7/lib/mysql2/mysql2.bundle: dlopen(/Library/Ruby/Gems/1.8/gems/mysql2-0.2.7/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.18.dylib (LoadError)
  Referenced from: /Library/Ruby/Gems/1.8/gems/mysql2-0.2.7/lib/mysql2/mysql2.bundle
  Reason: image not found - /Library/Ruby/Gems/1.8/gems/mysql2-0.2.7/lib/mysql2/mysql2.bundle

from /Library/Ruby/Gems/1.8/gems/mysql2-0.2.7/lib/mysql2.rb:8
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.12/lib/bundler/runtime.rb:68:in `require'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.12/lib/bundler/runtime.rb:68:in `require'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.12/lib/bundler/runtime.rb:66:in `each'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.12/lib/bundler/runtime.rb:66:in `require'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.12/lib/bundler/runtime.rb:55:in `each'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.12/lib/bundler/runtime.rb:55:in `require'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.12/lib/bundler.rb:120:in `require'
from /Users/macuser/Sites/simplecms/config/application.rb:7
from /Library/Ruby/Gems/1.8/gems/railties-3.0.6/lib/rails/commands.rb:28:in `require'
from /Library/Ruby/Gems/1.8/gems/railties-3.0.6/lib/rails/commands.rb:28
from /Library/Ruby/Gems/1.8/gems/railties-3.0.6/lib/rails/commands.rb:27:in `tap'
from /Library/Ruby/Gems/1.8/gems/railties-3.0.6/lib/rails/commands.rb:27
from script/rails:6:in `require'
from script/rails:6

I'm using a

• iMac
• Ruby 1.87
• Gem 1.7.2

Since I'm not experienced with anything Ruby, I'm lost on how to fix this.

Thanks in advance for your attention and help if possible.

Answer 1

Run these at the terminal:

gem install bundler
bundle

And then you should be able to boot the server.

Edit : You should really look into using rvm to manage your ruby installs and gemsets. It'll save you a lot of time and effort in installing them too.

Answer 2

I ran into the same problem as you (also attempting to go through the Lynda course), and also being a newbie I got pretty frustrated pretty quickly.

Buuuuut, after some searching, I found and answer here I got it to work.

First, I installed the 32-bit version of MySQL, as opposed to the 64-bit version, but I'm not sure if that made a difference.

Then, uninstall the Mysql gem

 gem uninstall mysql2

then reinstall it

sudo gem install mysql2

and finally

sudo install_name_tool -change libmysqlclient.18.dylib /usr/local/mysql/lib/libmysqlclient.18.dylib /Library/Ruby/Gems/1.8/gems/mysql2-0.2.7/lib/mysql2/mysql2.bundle

and you should be good to go! Worked for me anyways. good luck!

Answer 3

export DYLD_LIBRARY_PATH=/usr/local/mysql/lib/

这是对我有用的代码：D

Answer 4

I had the same problem. I simply ran the following code:

sudo ln -s /usr/local/mysql/lib/libmysqlclient.18.dylib /usr/lib

Press enter, and then run

rails server

and it worked!

Answer 5

Correct way that worked for me was:

cd ~ [command]

nano .bash_profile [command]

add this line of code:

export DYLD_LIBRARY_PATH="/usr/local/mysql/lib:$DYLD_LIBRARY_PATH"

ctrl+x [save]

y [yes]

cd Sites/sitename/ [command]

rails server [run WEBrick server]

and you should get this message:

=> Booting WEBrick
=> Rails 3.2.11 application starting in development on localhost:3000
=> Call with -d to detach