Ruby/PgSQL error on Rails start : cannot load such file -- pg_ext (LoadError)

Question

I'm new to Ruby (coming from a Java background) and was given access to a RoR project from a Git repository. I was able to get Ruby built with rbenv and Postgres installed via homebrew, installed the "pg" gem using the correct flags. Any ways I did "bundle install" on the project and it created a bundle, when I went to start the server:... any help will be definitely appreciated!

$ rails s
/Users//Projects/The /vendor/bundle/gems/pg-0.14.1/lib/pg.rb:4:in require': cannot load such file -- pg_ext (LoadError)

from /Users//Projects/The Usic/vendor/bundle/gems/pg-0.14.1/lib/pg.rb:4:in <top (required)>'

from /Users//.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.0/lib/bundler/runtime.rb:72:in require'

from /Users//.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.0/lib/bundler/runtime.rb:72:in block (2 levels) in require'

from /Users//.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.0/lib/bundler/runtime.rb:70:in each'

from /Users//.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.0/lib/bundler/runtime.rb:70:in block in require'

from /Users//.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.0/lib/bundler/runtime.rb:59:in each'

from /Users//.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.0/lib/bundler/runtime.rb:59:in require'

from /Users//.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/bundler-1.3.0/lib/bundler.rb:132:in require'

are you using ruby 2.0.0?

gekong
– gekong

2013-08-30 16:05:35 +00:00
Commented Aug 30, 2013 at 16:05 — gekong
– gekong, Commented Aug 30, 2013 at 16:05

Darkside · Accepted Answer · 2013-03-04 15:37:08Z

7

Issue also appears in Fedora 17.

Uninstall "pg" gem:

gem uninstall pg

Run bundle (assuming Gemfile contains "pg" gem):

bundle

answered Mar 4, 2013 at 15:37

Darkside

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1 Comment

Mike Melusky Over a year ago

Thanks! I'll give this a try tonight when I get home from work.

Conspicuous Compiler · Accepted Answer · 2015-04-02 18:29:34Z

7

Add the pg gem to your Gemfile. Then run:

bundle install
bundle update

edited Apr 2, 2015 at 18:29

Conspicuous Compiler

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answered Sep 19, 2014 at 10:06

Mukesh

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Comments

principat · Accepted Answer · 2016-07-21 07:14:08Z

2

If during the installation of the gem the pq installation is not in path so it could not be found by the gem. Than the gem would not work correct.

Check the path (try to start psql from commandline).
uninstall the pg-gem: gem unistall pg
and reinstall it: bundle install or gem install pg

answered Jul 21, 2016 at 7:14

principat

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1 Comment

Tim Over a year ago

I think this fixed the problem for me. I think I was running an old version of pg. Uninstalling and reinstalling gave me a newer version. Have an upvote.

Mario Zigliotto · Accepted Answer · 2013-03-01 07:47:07Z

1

I'm curious if you installed the pg gem before or after installing postgres via brew?

If pg was installed before you installed Postgres via brew, you may need to remove it and install it again so that it's compiled against your current version of Postgres.

Side note: postgresapp is a much better alternative to installing postgres via homebrew: http://postgresapp.com/

answered Mar 1, 2013 at 7:47

Mario Zigliotto

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Comments

Arman O · Accepted Answer · 2017-07-04 14:01:20Z

I've already installed the pg gem list pg

I also encountered this problem and I made it work. First, you run the command: $ gem install pg --pre
Successfully installed pg-0.21.0-x64-mingw32

Next, you update your Gemfile: gem 'pg', '~> 0.21.0'. That's it.

My rubygems environment are as follow:

RubyGems Environment:
  - RUBYGEMS VERSION: 2.6.12
  - RUBY VERSION: 2.3.3 (2016-11-21 patchlevel 222) [x64-mingw32]
  - INSTALLATION DIRECTORY: C:/Ruby23-x64/lib/ruby/gems/2.3.0
  - USER INSTALLATION DIRECTORY: C:/Users/armano/.gem/ruby/2.3.0
  - RUBY EXECUTABLE: C:/Ruby23-x64/bin/ruby.exe
  - EXECUTABLE DIRECTORY: C:/Ruby23-x64/bin
  - SPEC CACHE DIRECTORY: C:/Users/armano/.gem/specs
  - SYSTEM CONFIGURATION DIRECTORY: C:/ProgramData
  - RUBYGEMS PLATFORMS:
    - ruby
    - x64-mingw32
  - GEM PATHS:
     - C:/Ruby23-x64/lib/ruby/gems/2.3.0
     - C:/Users/armano/.gem/ruby/2.3.0
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :backtrace => false
     - :bulk_threshold => 1000
     - "gem" => "--no-ri --no-rdoc"
  - REMOTE SOURCES:
     - https://rubygems.org/

ari oki · Accepted Answer · 2024-02-07 05:22:45Z

0

I was getting the same error on my mac m1 and running this 2 commands solved the problem.

run gem uninstall pg and remove all version pg

run bundle install to install again pg

answered Feb 7, 2024 at 5:22

ari oki

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