Today when running rails application using agains MySQL Database, got the following error :

The strange thing is mysql already installed on my machine :

Seems rails cannot locate libmysqlclient.18.dylib which is located in /usr/local/mysql/lib/libmysqlclient.18.dylib

because by default rails locate that file in /usr/lib folder.

Simple solution for this problem is creating symlink from /usr/local/mysql/lib to /usr/lib.

Update for ElCapiten:

if throw Operation Not permitted, change target folder from /usr/lib to /usr/local/lib

and now rails can start perfectly ..

Jakarta , 9 April 2015

A. Ahmad Kusumah