its looking sqlite3 database which is not installed on your mac.

get the binary for mac from here http://www.sqlite.org/download.html

install it and then run
sudo gem install sqlite3-ruby

and you should be ok to go.

Otherwise if you want to use mysql then change your database.yml file
in the config directory like so (and remove all config options for
sqlite3)

development:
  adapter: mysql
  database: db_name
  username: root
  password:
  host: localhost
  encoding: utf8

do this for test and production as well


On Oct 29, 6:58 am, Daniel Bush <[EMAIL PROTECTED]> wrote:
> David Park wrote:
> > Hi All,
>
> > I just installed Ruby on Rails on my MacBook Pro and tried to create the
> > Hello World app that is documented in the Agile Development with Rails
> > book.  I followed all the instructions for creating the Hello World app
> > but get the following error when I try to load
> >http://localhost:3000/say/hello
>
> > MissingSourceFile in SayController#index
>
> > no such file to load -- sqlite3
>
> If you want to use mysql, then set up your rails project like this:
> % rails --database=mysql <name>
> If you leave out the database option, rails will assume you want
> sqlite3.
> (I think mysql used to be the default some time ago).
>
> You can alter the database and connection settings in config/
> database.yaml.
>
> --
> Daniel Bush
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