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Asked: 2026-05-13T18:09:20+00:00

I’ve got a problem trying to install the Ruby mysql gem driver. I recently

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I’ve got a problem trying to install the Ruby mysql gem driver.

I recently upgraded to Snow Leopard and did the Hivelogic manual install of MySQL. This all seems to work fine as I can access mysql from the command line and make changes to the database.

My problem is that if I now use

rake db:migrate

I get:

rake aborted!
uninitialized constant MysqlCompat::MysqlRes

(See full trace by running task with --trace)

Now it appears that my mysql gem isn’t working correctly as I can access MySQL fine from Python using the Python driver (which I compiled to). I therefore tried to rebuild the gem using the following command from this site: http://techliberty.blogspot.com/, (incidentally I am using a recent Intel MacBook Pro):

  sudo env ARCHFLAGS="-arch x86_64" gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config

This compiles although I get No definition for the documentation:

  Building native extensions.  This could take a while...
  Successfully installed mysql-2.8.1
  1 gem installed
  Installing ri documentation for mysql-2.8.1...

  No definition for next_result

  No definition for field_name
  ...

I’m a little stumped as my mysql_config is located in the correct place:

 /usr/local/mysql/bin/mysql_config

And I have removed all other instances of the mysql gem, from my system.

Any suggestions would be greatly appreciated. Many thanks.

PS I saw this previous post uninitialized constant MysqlCompat::MysqlRes (using mms2r gem) but it doesn’t seem applicable for my version.

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1 Answer

  1. Editorial Team

    OK, I’ve finally solved this problem.

    The reason this was occurring was that I had two versions of Ruby installed.

    1. I had compiled and installed my own version of Ruby following the HiveLogic guidelines, pre my installation of Snow Leopard.
    2. I then upgraded to Snow Leopard (which has it’s own version of Ruby)

    These two versions conflicted and meant that when ever I tried to install the the MySQL gem with the correct ARCHFLAGS the system thought I was using a different version of Ruby.

    The fix was simple enough:

    1. Remove the HiveLogic version of Ruby (https://content.pivotal.io/blog/removing-old-ruby-source-installation-after-a-leopard-upgrade)

    2. Recompile the MySQL gem with the correct ARCHFLAGS:

      sudo env ARCHFLAGS=”-arch x86_64″ gem install –no-rdoc –no-ri mysql — –with-mysql-config=/usr/local/mysql/bin/mysql_config

    Once I had done this everything worked fine.

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