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Deploy to Heroku

A team mate told me about Heroku today, when I was bashing my buggy hosting.

At the moment I am playing around with Ruby on Rails and I was looking forward to it for a while. This was the initial reason to change my hosting and move to a host who claimed to offer RoR services. But then I noticed that just deploying a very small project did not work too well.

I created a rails project

$ rails new blog
$ cd blog
$ rails generate scaffold post title:string body:text
$ rake db:migrate

Then I initialized git and commited it to github and heroku.

$ git init
$ git add .
$ git commit -m "Initial commit"
$ git add origin
$ git push -u origin master

$ heroku create
$ git push -u heroku master

This went well so far. But the final step did not work that well:

$ heroku rake db:migrate
rake aborted!
Please install the postgresql adapter: `gem install 
activerecord-postgresql-adapter` (pg is not part of the bundle. Add it to Gemfile.)

Tasks: TOP => db:migrate => db:load_config
(See full trace by running task with --trace)

First problem, there is no gem like ‘activerecord-postgresql-adapter’.

So I installed the regular pg gem which needed postgresql to install without errors (not too remarkable, eh).

$ brew install postgresql
$ gem install pg

I found a few hints on stackoverflow where lots of people seemed to have similar issues and so I went on to add the pg gem to the Gemfile and use bundle afterwards.

group :production do
    # Only gems for heroku
    gem 'therubyracer-heroku', '0.8.1.pre3'
    gem 'pg'
$ bundle install --without production

But while moving from stackoverflow to google to heroku to the manpages I missed one very important step. I have been trying to call

$ heroku rake db:migrate

after doing some changes, but with no luck. Then tried something else and again tried to migrate heroku.

Of course you have to commit the Gemfile changes and push ‘em to heroku. (Doh!)

$ git commit -m "Adding the pg gem to the Gemfile."
$ git push -u heroku master

And then the migrate will work with no errors.

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