Tech Tidbits - Ruby, Ruby On Rails, Merb, .Net, Javascript, jQuery, Ajax, CSS...and other random bits and pieces.

Tuesday, August 28, 2007

RMagick on Mac OSX

When installing RMagick, I found that X11 hadn't been installed. It's on the developer CD, which I didn't have handy, so here's what I did.

1) read the notes here:

2) Downloaded and installed Xcode and X11SDK from Apple Developers Center.

3) I still needed, so I downloaded and installed that from:

4) Downloaded and installed rm_install from:

This will install ImageMagick and RMagick with all dependencies.

I originally had downloaded ImageMagick binary and got this error when trying to install RMagick gem:

"Can't install RMagick. Can't find libMagick or one of the dependent libraries. Check the config.log file for more detailed information."

Info on the error here:

Sunday, August 5, 2007

Ruby on Rails - script/console

A nice and easy way to check you validation rules...

With a table called users with fields user_name, password, and email, we can add simple validation to the model User.

validates_uniqueness_of :user_name, :email
validates_length_of :user_name, :within => 4..20
validates_length_of :password, :within => 4..20
validates_length_of :email, :maximum => 50
validates_format_of :user_name,
:with => /^[A-Z0-9_]*$/i,
:message => "must contain only letters, " +
"numbers and underscores"
validates_format_of :email,
:with => /@/,
:message => "must be a valid email address"

Then using script/console, we can check our validation:

First, try to add a bad record:

$ script/console
Loading development environment.
>> user = => "pooh bear",
?> :password => "pb",
?> :email => "")
=> #"pooh bear", "password"=>"pb", "email"=>""}>
=> false

Then you can inspect the errors individually with errors.on method:

>> user.errors.on(:user_name)
=> "must contain only letters, numbers and underscores"
>> user.errors.on(:password)
=> "is too short (minimum is 4 characters)"
>> user.errors.on(:email)
=> "must be a valid email address"

or all at once with errors.full_messages method:

>> user.errors.full_messages
=> ["Screen name must contain only letters, numbers and underscores", "Password is too short (minimum is 4 characters)", "Email must be a valid email address"]

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Developer (Ruby on Rails, iOS), musician/composer, Buddhist, HSP, Vegan, Aspie.