Rails-MySQL Error - uninitialized constant MysqlCompat::MysqlRes

Question

Trying to get a Rails app running on Snow Leopard.

• Downloaded mysql-5.5.8-osx10.6-x86_64.dmg and ran installer
• Ruby 1.8.7 (Default OS X version)

Answer 1

Not had the experience myself and I'm using Snow Leopard, RVM and rails 2.3.5 to 3.0.3, but found another view which deals with the uninstall and reinstall via :

export ARCHFLAGS="-arch i386 -arch x86_64" ;sudo gem install --no-rdoc --no-ri -v=2.7 mysql -- --with-mysql-dir=/usr/local/mysql --with-mysql-config=/usr/local/mysql/bin/mysql_config

For more details see the posting at: http://accidentaltechnologist.com/apple/fixing-uninitialized-constant-mysqlcompatmysqlres-error-on-snow-leopard/

Answer 2

For El Capitan you don't need to uninstall / install.

Just found your libmysqlclient.18.dylib file. Location will depent on how you installed mysql

locate libmysqlclient.18.dylib

Once you have the path create a symb link as:

ln -s /usr/local/mysql-5.5.20-osx10.6-x86_64/lib/libmysqlclient.18.dylib /usr/local/lib/libmysqlclient.18.dylib

You have two change first param according to your dynamic library location (use the first command).

On El Capitan the link should be to /usr/local/lib. On previous versions link was to /usr/lib/