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+--- 

+layout: default

+title: Syntax Highlighting Debug

+---

+{% highlight ruby linenos %}

+  def rebuild_site(relative)

+    puts ">>> Change Detected to: #{relative} <<<"

+    IO.popen('rake generate') do |io|

+      print(io.readpartial(512)) until io.eof?

+    end

+    puts '>>> Update Complete <<<'

+  end

+  

+{% endhighlight %}

+

+{% highlight ruby linenos %}

+require 'active_support/core_ext/array'

+require 'active_support/core_ext/hash/except'

+require 'active_support/core_ext/object/metaclass'

+

+module ActiveRecord

+  module NamedScope

+    extend ActiveSupport::Concern

+

+    # All subclasses of ActiveRecord::Base have one named scope:

+    # * <tt>scoped</tt> - which allows for the creation of anonymous \scopes, on the fly: <tt>Shirt.scoped(:conditions => {:color => 'red'}).scoped(:include => :washing_instructions)</tt>

+    #

+    # These anonymous \scopes tend to be useful when procedurally generating complex queries, where passing

+    # intermediate values (scopes) around as first-class objects is convenient.

+    #

+    # You can define a scope that applies to all finders using ActiveRecord::Base.default_scope.

+    included do

+      named_scope :scoped, lambda { |scope| scope }

+    end

+

+    module ClassMethods

+      def scopes

+        read_inheritable_attribute(:scopes) || write_inheritable_attribute(:scopes, {})

+      end

+

+      # Adds a class method for retrieving and querying objects. A scope represents a narrowing of a database query,

+      # such as <tt>:conditions => {:color => :red}, :select => 'shirts.*', :include => :washing_instructions</tt>.

+      #

+      #   class Shirt < ActiveRecord::Base

+      #     named_scope :red, :conditions => {:color => 'red'}

+      #     named_scope :dry_clean_only, :joins => :washing_instructions, :conditions => ['washing_instructions.dry_clean_only = ?', true]

+      #   end

+      # 

+      # The above calls to <tt>named_scope</tt> define class methods Shirt.red and Shirt.dry_clean_only. Shirt.red, 

+      # in effect, represents the query <tt>Shirt.find(:all, :conditions => {:color => 'red'})</tt>.

+      #

+      # Unlike <tt>Shirt.find(...)</tt>, however, the object returned by Shirt.red is not an Array; it resembles the association object

+      # constructed by a <tt>has_many</tt> declaration. For instance, you can invoke <tt>Shirt.red.find(:first)</tt>, <tt>Shirt.red.count</tt>,

+      # <tt>Shirt.red.find(:all, :conditions => {:size => 'small'})</tt>. Also, just

+      # as with the association objects, named \scopes act like an Array, implementing Enumerable; <tt>Shirt.red.each(&block)</tt>,

+      # <tt>Shirt.red.first</tt>, and <tt>Shirt.red.inject(memo, &block)</tt> all behave as if Shirt.red really was an Array.

+      #

+      # These named \scopes are composable. For instance, <tt>Shirt.red.dry_clean_only</tt> will produce all shirts that are both red and dry clean only.

+      # Nested finds and calculations also work with these compositions: <tt>Shirt.red.dry_clean_only.count</tt> returns the number of garments

+      # for which these criteria obtain. Similarly with <tt>Shirt.red.dry_clean_only.average(:thread_count)</tt>.

+      #

+      # All \scopes are available as class methods on the ActiveRecord::Base descendant upon which the \scopes were defined. But they are also available to

+      # <tt>has_many</tt> associations. If,

+      #

+      #   class Person < ActiveRecord::Base

+      #     has_many :shirts

+      #   end

+      #

+      # then <tt>elton.shirts.red.dry_clean_only</tt> will return all of Elton's red, dry clean

+      # only shirts.

+      #

+      # Named \scopes can also be procedural:

+      #

+      #   class Shirt < ActiveRecord::Base

+      #     named_scope :colored, lambda { |color|

+      #       { :conditions => { :color => color } }

+      #     }

+      #   end

+      #

+      # In this example, <tt>Shirt.colored('puce')</tt> finds all puce shirts.

+      #

+      # Named \scopes can also have extensions, just as with <tt>has_many</tt> declarations:

+      #

+      #   class Shirt < ActiveRecord::Base

+      #     named_scope :red, :conditions => {:color => 'red'} do

+      #       def dom_id

+      #         'red_shirts'

+      #       end

+      #     end

+      #   end

+      #

+      #

+      # For testing complex named \scopes, you can examine the scoping options using the

+      # <tt>proxy_options</tt> method on the proxy itself.

+      #

+      #   class Shirt < ActiveRecord::Base

+      #     named_scope :colored, lambda { |color|

+      #       { :conditions => { :color => color } }

+      #     }

+      #   end

+      #

+      #   expected_options = { :conditions => { :colored => 'red' } }

+      #   assert_equal expected_options, Shirt.colored('red').proxy_options

+      def named_scope(name, options = {}, &block)

+        name = name.to_sym

+        scopes[name] = lambda do |parent_scope, *args|

+          Scope.new(parent_scope, case options

+            when Hash

+              options

+            when Proc

+              options.call(*args)

+          end, &block)

+        end

+        metaclass.instance_eval do

+          define_method name do |*args|

+            scopes[name].call(self, *args)

+          end

+        end

+      end

+    end

+

+    class Scope

+      attr_reader :proxy_scope, :proxy_options, :current_scoped_methods_when_defined

+      NON_DELEGATE_METHODS = %w(nil? send object_id class extend find size count sum average maximum minimum paginate first last empty? any? many? respond_to?).to_set

+      [].methods.each do |m|

+        unless m =~ /^__/ || NON_DELEGATE_METHODS.include?(m.to_s)

+          delegate m, :to => :proxy_found

+        end

+      end

+

+      delegate :scopes, :with_scope, :scoped_methods, :to => :proxy_scope

+

+      def initialize(proxy_scope, options, &block)

+        options ||= {}

+        [options[:extend]].flatten.each { |extension| extend extension } if options[:extend]

+        extend Module.new(&block) if block_given?

+        unless Scope === proxy_scope

+          @current_scoped_methods_when_defined = proxy_scope.send(:current_scoped_methods)

+        end

+        @proxy_scope, @proxy_options = proxy_scope, options.except(:extend)

+      end

+

+      def reload

+        load_found; self

+      end

+

+      def first(*args)

+        if args.first.kind_of?(Integer) || (@found && !args.first.kind_of?(Hash))

+          proxy_found.first(*args)

+        else

+          find(:first, *args)

+        end

+      end

+

+      def last(*args)

+        if args.first.kind_of?(Integer) || (@found && !args.first.kind_of?(Hash))

+          proxy_found.last(*args)

+        else

+          find(:last, *args)

+        end

+      end

+

+      def size

+        @found ? @found.length : count

+      end

+

+      def empty?

+        @found ? @found.empty? : count.zero?

+      end

+

+      def respond_to?(method, include_private = false)

+        super || @proxy_scope.respond_to?(method, include_private)

+      end

+

+      def any?

+        if block_given?

+          proxy_found.any? { |*block_args| yield(*block_args) }

+        else

+          !empty?

+        end

+      end

+

+      # Returns true if the named scope has more than 1 matching record.

+      def many?

+        if block_given?

+          proxy_found.many? { |*block_args| yield(*block_args) }

+        else

+          size > 1

+        end

+      end

+

+      protected

+      def proxy_found

+        @found || load_found

+      end

+

+      private

+      def method_missing(method, *args, &block)

+        if scopes.include?(method)

+          scopes[method].call(self, *args)

+        else

+          with_scope({:find => proxy_options, :create => proxy_options[:conditions].is_a?(Hash) ?  proxy_options[:conditions] : {}}, :reverse_merge) do

+            method = :new if method == :build

+            if current_scoped_methods_when_defined && !scoped_methods.include?(current_scoped_methods_when_defined)

+              with_scope current_scoped_methods_when_defined do

+                proxy_scope.send(method, *args, &block)

+              end

+            else

+              proxy_scope.send(method, *args, &block)

+            end

+          end

+        end

+      end

+

+      def load_found

+        @found = find(:all)

+      end

+    end

+  end

+end

+{% endhighlight %}

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