I currently have Ruby on Rails installed via RVM in Ubuntu 12.04. The default database is set up in SQLite3, but I'd like to switch to PostgreSQL for the purposes of pushing to Heroku. How can I accomplish this?
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3 Answers
Here are the steps I've followed:
Install PostgreSQL and development package
$ sudo apt-get install postgresql
$ sudo apt-get install libpq-dev
Set up a user that is the same as my Ubuntu log-in
$ sudo su postgres -c psql
postgres=# CREATE ROLE <username> SUPERUSER LOGIN;
postgres=# \q
Modify Gemfile
# Remove gem 'sqlite3'
gem 'pg'
Modify database.yml in app directory
development:
adapter: postgresql
encoding: unicode
database: appname_development
pool: 5
timeout: 5000
username: <username>
password:
test:
adapter: postgresql
encoding: unicode
database: appname_test
pool: 5
timeout: 5000
username: <username>
password:
Run bundle install
$ bundle install
Create databases and migrations
$ rake db:create:all
$ rake db:migrate
Here are the sources I used to help:
http://mrfrosti.com/2011/11/postgresql-for-ruby-on-rails-on-ubuntu/
http://railscasts.com/episodes/342-migrating-to-postgresql
https://devcenter.heroku.com/articles/local-postgresql
11 Comments
Hengjie
If you want to add a password use this command after running
CREATE ROLE: ALTER ROLE <username> WITH PASSWORD '<yourpassword>'; then obviously add your password into database.ymlHengjie
Alternatively, if you're just creating the role for the first time and want to enter in a password as well:
CREATE ROLE <username> SUPERUSER LOGIN PASSWORD '<yourpassword>';
jmontross
FATAL: Peer authentication failed for user "awesome"
Alexander Popov
Worked for me. I created my psql user with following command:
CREATE ROLE Alex SUPERUSER LOGIN;. In the database.yml I also set my username as Alex and got the same error as jmontross. Then I changed it to alex and everything worked. I also had to run rake db:migrate RAILS_ENV=test. Also note - this method migrates the database from sqlite3 to postgres, but does not migrate the actual data in the database. To migrate it as well, refer to the railscast mentioned in the answer.
alf
2 years later, the only thing that's a bit old from this answer is the postgresql version. Using the command
sudo apt-get install postgresql will install the latest available version. |
For all Ubuntu 13.10 users that open this thread follow the steps below to install postresql:
sudo sh -c "echo 'deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main' > /etc/apt/sources.list.d/pgdg.list"
wget --quiet -O - http://apt.postgresql.org/pub/repos/apt/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update
sudo apt-get install postgresql-common -t saucy
sudo apt-get install postgresql-9.2 libpq-dev
since there isn't an official Postgres repository for Ubuntu 13.10.
Then create the user as Nick explain (you can specify a password too):
sudo su postgres -c psql
postgres=# CREATE ROLE gotqn SUPERUSER LOGIN;
postgres=# \password gotqn
postgres=# \q
Note: Replace the gotqn above with whoami result:
The easiest way to create your rails application is to specify you are using postgresql as follows:
rails new Demo -d postgresql
The code above will automatically add the pg gem in your GemFile and create appropriate database.yml file:
development:
adapter: postgresql
encoding: unicode
database: Demo_development
pool: 5
username: gotqn
password: mypass
Note: You need to change the username and to specify the correct password if you have set such.
Then run rake db:create and start the rails server.
Comments
sudo sh -c "echo 'deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main' > /etc/apt/sources.list.d/pgdg.list"
wget --quiet -O - http://apt.postgresql.org/pub/repos/apt/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update
sudo apt-get install postgresql-common
sudo apt-get install postgresql-9.3 libpq-dev
