Upgrade to rails3 + ruby1.9.2 the various problems encountered in the process

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As ubunut system comes with rails and ruby versions are relatively low, so I plan to get rid of the previous version of the re-compiled, N encountered much trouble, it is in good, but also recognized the many problems, understand the meaning of some stuff

An upgrade to 1.9.2 ruby1.8.7

First, download the ruby-1.9.2
 wget ftp://ftp.ruby-lang.org//pub/ruby/1.9/ruby-1.9.2-p0.tar.gz
  tar -zxvf ruby-1.9.2-p0.tar.gz
  cd ruby-1.9.2-p0
  .configure -prefix=/usr/local/ruby #  Specify the installation path  
  make test 
  make install               # Compile and install  
  sudo ln -s /usr/local/ruby/bin/ruby /usr/bin/ruby #  Create a soft link  

All goes well, but do not know Zehui Shi, seemingly engaged in gem yesterday when, again get back to 1.8 again today, restart the computer, or 1.8,1.9 also a mess, and the decision over again So, modify all the steps to remove the usr / local / ruby remove usr / bin / ruby under all
Re the above steps (ln piece orders excluded)
Last changed my environment variable path edit the file etc / environment

Modification is completed, reboot the system, buttoned

 ruby -v
 ruby 1.9.2p0 (2010-08-18 revision 29036) [i686-linux]

ruby installation is complete

Second, the escalation of GEM

Run the gem command, an error message: Error ruby1.8.7 dependent, this is the reason that previous residue / usr / bin under a series of gem gem1.8 gem × × of the class of all get rid of

After the installation ruby1.9.2 gem is already installed as above set path, gem in the usr / local / ruby / bin directory, so remove those residues can still run after gem
  gem -v

However, running gem list
 ERROR:  Loading command: list (LoadError)
    no such file to load -- zlib
 ERROR:  While executing gem ... (NameError)
    uninitialized constant Gem::Commands::ListCommand

Search, I: (http://javaeye.shaduwang.com/?www/topic/743850), said that the lack of zlib
  (1)sudo apt-get install zlib1g-dev 
  (2) And then to the source directory under the ext/zlib   ( Just unzip the ruby1.9.2 directory  )
  (3)ruby extconf.rb         ( Needs administrator rights  )
  (5)sudo make install

This can be run gem list
gem install × × can run

Additional information:
Although the path set path environment variable, or to establish what soft links, otherwise the implementation of sudo ruby or sudo gem will still error when:
sudo: ruby: command not found

So also the establishment of the following soft links
sudo ln -s /usr/local/ruby/bin/ruby /usr/bin/ruby 
sudo ln -s /usr/local/ruby/bin/gem /usr/bin/gem

Then run sudo gem-v 1.3.7 Output

Third, install rails3

Running rails-v
bash: / usr / bin / rails: / usr/bin/ruby1.8: damage to the interpreter: No file or directory

find a moment rails find / usr/lib/ruby/gems/1.8 directory underneath rails file
/ Usr / bin / rails is called when running rails
Delete all

Implementation of the command gem install rails to install rails
After installation is complete run rails-v no problem but sudo rails-v command on the back with the above tips do not have this same reason: sudo ln-s / usr / local / ruby / bin / rails / usr / bin / rails

sudo rails-v has no problem

4 Other issues

Open yesterday's rails3 + ruby1.8 projects, rake test error of some gem update first, resulting in the version number does not correspond to, later amended, rake test
Error: Errors running test: units!
Do not know what wrong

Run separately
rake test:units
!!! Missing the mysql gem. Add it to your Gemfile: gem 'mysql', '2.8.1'
are seen under the gem list, found this gem not installed mysql

So the gem install mysql
sudo gem install mysql

Error, the stack exception as follows:
Building native extensions.  This could take a while...
ERROR:  Error installing mysql:
        ERROR: Failed to build gem native extension.

/usr/local/ruby/bin/ruby extconf.rb
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... yes
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:

Gem files will remain installed in /usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql-2.8.1 for inspection.
Results logged to /usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql-2.8.1/ext/mysql_api/gem_make.out


The following result is not installed
apt-get install libmysqlclient-dev

Installed this, finally a gem install mysql

To run rake test
Wrong again
!!! Missing the mysql gem. Add it to your Gemfile: gem 'mysql', '2 .8.1 '
Look, forget the gem 'mysql', '2 .8.1 'words into Gemfile file

Finally ... ...
You can run rake test the
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