Question

I am using postgres on a rails app after switching the working app from sqlite to postgres. When I run rake I get the error cannot load such file — mysql2. I have never used mysql for this app. Any ideas?

EDIT:

My gemfile does not include mysql and the database adapter is postgresql

This is the stack trace:

c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thinking-sphinx-3.0.1/lib/thinking_sphinx.rb:5:in `require'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thinking-sphinx-3.0.1/lib/thinking_sphinx.rb:5:in `<top (required)>'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thinking-sphinx-3.0.1/lib/thinking-sphinx.rb:1:in `require'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/thinking-sphinx-3.0.1/lib/thinking-sphinx.rb:1:in `<top (required)>'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler/runtime.rb:68:in `require'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler/runtime.rb:66:in `each'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler/runtime.rb:66:in `block in require'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler/runtime.rb:55:in `each'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler/runtime.rb:55:in `require'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22/lib/bundler.rb:122:in `require'
C:/Users/Rotimi/My Documents/Aptana Studio 3 Workspace/Book_Search/book_search/config/application.rb:13:in `<top (required)>'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
C:/Users/Rotimi/My Documents/Aptana Studio 3 Workspace/Book_Search/book_search/Rakefile:5:in `<top (required)>'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/rake_module.rb:25:in `load'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/rake_module.rb:25:in `load_rakefile'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:583:in `raw_load_rakefile'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:89:in `block in load_rakefile'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:160:in `standard_exception_handling'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:88:in `load_rakefile'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:72:in `block in run'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:160:in `standard_exception_handling'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:70:in `run'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.0.3/bin/rake:33:in `<top (required)>'
c:/RailsInstaller/Ruby1.9.3/bin/rake:19:in `load'
c:/RailsInstaller/Ruby1.9.3/bin/rake:19:in `<main>'

Answer 1

I think your issue is with thinking-sphinx. I assume you’ve built it with the following options:

./configure –prefix=/usr/local –with-pgsql –without-mysql

Also, note that mysql2 is a requirement for thinking-sphinx. See here:

https://github.com/pat/thinking-sphinx

in particular under installation:

It’s a gem, so install it like you would any other gem. You will also
need to specify the Mysql2 gem as well (this is not an inbuilt
dependency because JRuby, when supported, will need something
different):

gem ‘mysql2’, ‘0.3.12b4’ gem ‘thinking-sphinx’, ‘3.0.0’ The
mysql2 gem is required for connecting to Sphinx, so please include it
even when you’re using PostgreSQL for your database.