# Problem with installation of Rails 3 **URL:** \ **Category:** Rails\ **Created:** [May 20, 2010, 4:11pm UTC](https://www.ruby-forum.com/t/problem-with-installation-of-rails-3/188925 "2010-05-20T16:11:40Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![sivakumar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/bb73d2/32.png) [@sivakumar](https://www.ruby-forum.com/u/sivakumar)\ **Post date:** [May 20, 2010, 4:11pm UTC](https://www.ruby-forum.com/t/problem-with-installation-of-rails-3/188925/1 "2010-05-20T16:11:40Z")
Help me out guys… While installing rails 3 i got the following message :~$ sudo gem install rails --pre Successfully installed rails-3.0.0.beta3 1 gem installed Installing ri documentation for rails-3.0.0.beta3… File not found: lib My gem list :~$ gem list \*\*\* LOCAL GEMS \*\*\* abstract (1.0.0) actionmailer (3.0.0.beta3, 2.3.5) actionpack (3.0.0.beta3, 2.3.5) activemodel (3.0.0.beta3) activerecord (3.0.0.beta3, 2.3.5) activeresource (3.0.0.beta3, 2.3.5) activesupport (3.0.0.beta3, 2.3.5) arel (0.3.3, 0.2.pre) authlogic (2.1.3) builder (2.1.2) bundler (0.9.25) erubis (2.6.5) ffi (0.6.3) i18n (0.3.7) mail (2.2.1, 2.1.5.3) memcache-client (1.8.3, 1.7.8) mime-types (1.16) pg (0.9.0) polyglot (0.3.1) postgres (0.7.9.2008.01.28) rack (1.1.0, 1.0.1) rack-mount (0.6.3, 0.4.7, 0.4.0) rack-test (0.5.3) rails (3.0.0.beta3) rails3b (3.0.1) railties (3.0.0.beta3) rake (0.8.7) ruby-pg (0.7.9.2008.01.28) rubygems-update (1.3.7) SystemTimer (1.2) text-format (1.0.0) text-hyphen (1.0.0) thor (0.13.6) treetop (1.4.5) tzinfo (0.3.20) Please Help me out… ---
**Author:** ![sivakumar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/bb73d2/32.png) [@sivakumar](https://www.ruby-forum.com/u/sivakumar)\ **Post date:** [May 20, 2010, 4:20pm UTC](https://www.ruby-forum.com/t/problem-with-installation-of-rails-3/188925/2 "2010-05-20T16:20:06Z")
On May 20, 9:11 am, Siva K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Help me out guys… > > While installing rails 3 i got the following message > > :~$ sudo gem install rails --pre > > Successfully installed rails-3.0.0.beta3 > 1 gem installed > Installing ri documentation for rails-3.0.0.beta3… > File not found: lib Pretty sure that’s just a documentation error. Looks like your Rails beta3 gem installed fine. Jeff ---
**Author:** ![sivakumar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/bb73d2/32.png) [@sivakumar](https://www.ruby-forum.com/u/sivakumar)\ **Post date:** [May 20, 2010, 4:26pm UTC](https://www.ruby-forum.com/t/problem-with-installation-of-rails-3/188925/3 "2010-05-20T16:26:55Z")
Jeff C. wrote: > Pretty sure that’s just a documentation error. Looks like your Rails > beta3 gem installed fine. > > Jeff Thanx Jeff I had one more problem. I dont want to use sqlite3 instead want to use Postgresql… Do u have any idea of how to do it… I think I installed all the required gems I want to modify the database.yml file which I did but even cant get the things done!! Someone or other please help me out in this as well Siva ---
**Author:** ![sivakumar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/bb73d2/32.png) [@sivakumar](https://www.ruby-forum.com/u/sivakumar)\ **Post date:** [May 20, 2010, 9:45pm UTC](https://www.ruby-forum.com/t/problem-with-installation-of-rails-3/188925/4 "2010-05-20T21:45:37Z")
On May 20, 9:26 am, Siva K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > I had one more problem. I dont want to use sqlite3 instead want to use > Postgresql… > > Do u have any idea of how to do it… > > I think I installed all the required gems > > I want to modify the database.yml file which I did but even cant get the > things done!! If you have already generated the app, you need a section like this in your database.yml: development: adapter: postgresql host: localhost # or your server name database: my\_app\_development username: me password: password and similarly change the test and production sections too. Once you’ve done that, you can use rake db:create to automatically create your local postgres database which I think is pretty cool. In the future, when you create a new Rails app, you can use the -d option to specify postgresql, which will generate the database.yml for you from the beginnning. Jeff [purpleworkshops.com](http://purpleworkshops.com) ---
**Author:** ![sivakumar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/bb73d2/32.png) [@sivakumar](https://www.ruby-forum.com/u/sivakumar)\ **Post date:** [May 20, 2010, 11:13pm UTC](https://www.ruby-forum.com/t/problem-with-installation-of-rails-3/188925/5 "2010-05-20T23:13:08Z")
Jeff C. wrote: database.yml: > development: > adapter: postgresql > host: localhost # or your server name > database: my\_app\_development > username: me > password: password > > and similarly change the test and production sections too. > > Once you’ve done that, you can use rake db:create to automatically > create your local postgres database which I think is pretty cool. > > In the future, when you create a new Rails app, you can use the -d > option to specify postgresql, which will generate the database.yml for > you from the beginnning. > > Jeff > > [purpleworkshops.com](http://purpleworkshops.com) Once again thank you jeff I was able to change the database.yml file…but I dint understand what to change on test and production sections(I was a new guy for ROR) I was able to create a new db too. Thanks jeff again, this info helped me alot… Could u please tell me what to update on those two files Best Wishes Siva ---
**Author:** ![sivakumar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/bb73d2/32.png) [@sivakumar](https://www.ruby-forum.com/u/sivakumar)\ **Post date:** [May 20, 2010, 8:07pm UTC](https://www.ruby-forum.com/t/problem-with-installation-of-rails-3/188925/6 "2010-05-20T20:07:15Z")
On Thu, May 20, 2010 at 7:26 AM, Siva K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Postgresql… > Siva Siva, you’ll need to following these steps: a) Install the PostgreSQL database engine b) gem install pg c) Update the Gemfile ``` gem "pg" ``` Good luck, -Conrad –