I recently updated to rails 4.1.6 and ruby 2.1.3p242. I also updated all gems on my system. After creating a new app, I keep getting a pg_ext load file error on running the server. I'm on windows 8 x64 with PostgreSQL 9.3. The pg gem was working fine under my previous RoR installation which was rails 3.2 and ruby 1.9.3.
Under the gem's installation directory, I've a 2.0/pg_ext.so file. I tried renaming the folder to 2.1 and ran the server. The result was the same. I assume it's cause Ruby doesn't allow to Require a .so file. Below is the screenshot of the error:
Any help would be really appreciated. Thanks!
Posted question on the official Gem page:
https://bitbucket.org/ged/ruby-pg/issue/192/pg_ext-load-error
As per the suggestion, I installed the pre-version of the next release. That gave me another error which was solved using:
https://github.com/tzinfo/tzinfo/wiki/Resolving-TZInfo::DataSourceNotFound-Errors TZInfo::DataSourceNotFound error starting Rails v4.1.0 server on Windows
Posting the answer to help people facing similar problems in the future.
1) In the command line enter:
gem install pg --pre
gem list pg
2) In the Gemfile set the gem to the newly installed version:
gem 'pg', '~> 0.18.2'
来源：https://stackoverflow.com/questions/26617779/pg-pg-ext-load-error-in-rails