Errors installing mysql2 on ubuntu

Upon installing the mysql2 gem I got the following error:

ERROR: Failed to build gem native extension.

I fixed it with:

sudo apt-get install libmysql-ruby libmysqlclient-dev

Thanks to this post here

Ruby - dynamically create an object :)

Thought this was really cool :)

def create_object(class_name, *args)
  the_class = Object.const_get(class_name)
  the_object = the_class.send :new, *args if !args.empty?
  the_object = the_class.send :new if args.empty?
  
  return the_object
end

Running ruby 1.9.3 on Heroku

I had a few problems trying to get ruby 1.9.3 running on Heroku.

Here's the error I had:

 Heroku receiving push
-----> Removing .DS_Store files
-----> Ruby/Sinatra app detected
-----> Gemfile detected, running Bundler version 1.0.7
       Unresolved dependencies detected; Installing...
       Using --without development:test
       /tmp/build_jpq0amd2bp92/Gemfile:5:in `evaluate': undefined method `ruby' for # (NoMethodError)

Here's what I did to fix it:

     Add the following to Gemfile: 
        ruby '1.9.3'
        gem 'bundler', '1.2.0.pre'

git remote rm heroku
heroku create --stack cedar
gem install bundler --pre
bundle install
git commit -am "fixed heroku problem"
git push heroku master

And some notes to myself for other stuff I need:

heroku addons:add mongohq:free
heroku config:add TWITTER_KEY=`echo $TWITTER_KEY`
heroku config:add TWITTER_SECRET_KEY=`echo $TWITTER_SECRET_KEY`

How to make Ethernet work on ubuntu!

So my computer has an Ethernet card which doesn't work out of the box with Ubuntu 11 or 12.04 - which means that I couldn't connect to the internet!


When I ran:


lspci | grep Ethernet 


It showed my card as having a RTL8111 Ethernet controller.


Long story short, this post helped me get the card going properly (for the second time now...)

Setting up postgres on ubuntu, and getting it going on heroku

links: https://help.ubuntu.com/community/PostgreSQL,

sudo apt-get install postgresql
sudo apt-get install postgresql-server-dev-all

#Create a user account for postgresql, and a database with the name of your user account
sudo -u postgres createuser --superuser myUbuntuUsername
sudo -u postgres psql
postgres=# \password myUbuntuUsername
\q
createdb myUbuntuUsername

#Check that your postgres useraccount was setup properly
psql
\du 

Use require

'dm-core'

instead of

require 'datamapper'

http://devcenter.heroku.com/articles/database

Keep test and production gems separate:
http://yehudakatz.com/2010/05/09/the-how-and-why-of-bundler-groups/

Working with rails

gem install rails
sudo apt-get install libmysql-ruby libmysqlclient-dev

rails new myProject -d mysql

Helpful sinatra info

https://github.com/toolmantim/sinatra-content-for -- allow you to pass in say the title from a page to the layout.