Ruby：`gem_original_require'：没有这样的文件要加载 - rails（LoadError）

Question

I just deleted ruby 1.9.1 and installed 1.8.7, but my bash still points at 1.9.1 for when I look for rails.

emai@vpc-db:~$ rails --version
bash: /usr/local/bin/rails: /usr/bin/ruby1.9.1: bad interpreter: No such file or directory

emai@vpc-db:~$ ruby --version
ruby 1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]

Can anyone help? How do I make bash look at 1.8.7?

Answer 1

Your ruby is pretty old (and as of this week, officially deprecated). It's also really weird that your gems are installed in /usr/local/bin .

You might want to look into rbenv

This will probably clean up your issue right away

---

After you have rbenv setup, I compile my rubies like this

# start in your home directory
cd $HOME    

# make a src folder for compiling ruby
mkdir -p .src && cd .src    

# download ruby
curl -O ftp://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p247.tar.gz    

# extract compressed file
tar -xzf ruby-2.0.0-p247.tar.gz    

# cd to folder
cd ruby-2.0.0-p247    

# configure
./configure --prefix=$HOME/.rbenv/versions/2.0.0-p247 --with-opt-dir=/path/to/openssl --enable-shared    

# make and install
make && make install    

# cleanup
rm -rf ruby-2.0.0-p247

Now let's use it!

# make rbenv aware of our new rubies
rbenv rehash

# set our new version as the default
rbenv global 2.0.0-p247

# let's check it out!
ruby --version
ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin12.3.0]

Now let's get that rails going

# install rails
gem install rails

# check the version
rails --version
Rails 4.0.0