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Keyword - ruby

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Thursday 27 March 2008

ruby: url_to_constant

By Geoffrey on Thursday 27 March 2008, 23:04 - Coding - one comment

A small bit of ruby to get a constant from an URL:

require 'uri'
def url_to_constant(url)
	return URI.parse(url).host.gsub(/^www\./, '').capitalize.gsub(/[^a-z][a-z]/i) { |m| m.gsub(/[^a-z]/, '').upcase }.constantize
end

Nothing exceptionnal here, just a pretext to post something.

Sunday 2 December 2007

yaml, activerecord and acts_as_nested_set

By Geoffrey on Sunday 2 December 2007, 16:41 - Coding - no comment

I used to use this yaml_to_ar lib from christophe to load categories tree into my database, using acts_as_tree in the model that was perfect. Arrived the time when I felt the need to use acts_as_nested_set instead, for which I had to fill the lft and rgt columns. So I just rewrote the yaml_to_ar piece of code (put this in lib/yaml_to_ar.rb):

require 'yaml'
 
class YAML_to_AR
 
  def initialize(file, model)
    @data = File.open(file) { |yf| YAML::load( yf ) }
    @model = model
  end
 
  def process(data = @data, parent = nil)
    if data.is_a? Array
      data.each do |val|
        process(val, parent)
      end
    elsif data.is_a? Hash
      data.each do |key,val|
        parent = @model.create(:title => key)
        process(val, parent)
      end
    elsif data.is_a? String
      parent.add_child(@model.create(:title => data))
    end
  end
 
 end

This should handle both acts_as_tree and acts_as_nested. To ease things a bit further, I also wrote a rake task (to drop in lib/tasks/db_load_categories.rake for example):

namespace :db do
  desc "Loads categories defaults data"
  task :load_categories => :environment do
    require 'lib/yaml_to_ar'
    Category.delete_all
    categories = YAML_to_AR.new('db/categories.yml', Category)
    categories.process
  end
end

Now I just rake db:load_categories, and voila !

Wednesday 28 November 2007

my first rails plugin: named_resources

By Geoffrey on Wednesday 28 November 2007, 13:00 - Coding - 6 comments

It's a simple plugin (2 lines of code beside class and modules declarations) which allows routes created via the map.resources mechanism to be customized. Say you have the following map:

map.resources :members

It will generate routes like:

/members
/members/:id
/members/new

No say you want to i18n your app, in french for example, what do you do ? You just can't out of the box. This is where my plugin enters into action, just add a :route_name parameter to the map.resources call and you're set:

map.resources :members, :route_name => 'utilisateurs'

will generate routes like:

/utilisateurs
/utilisateurs/:id
/utilisateurs/new

It shall also work for nested resources, although I did not test that.

The code is actually pretty simple:

module ActionController
  module Resources
    class Resource
      def path
        route_name = @options.include?(:route_name) ? @options[:route_name] : @plural
        @path ||= "#{path_prefix}/#{route_name}"
      end 
    end 
  end 
end

To install just use script/plugin:

script/plugin install http://tools.assembla.com/svn/riskle/rails/plugins/named_resources

or to install as an svn:external resource:

script/plugin install -x http://tools.assembla.com/svn/riskle/rails/plugins/named_resources