gistfile1.rb

# part of the BL core lib...
module Blacklight
  
  module SolrDoc
    
    def self.decorators
      @decorators ||= {}
    end
    
    def self.decorate(name = :default, &blk)
      decorators[name] = blk
    end
    
    def self.create(hash)
      decorators.each { |k,d| d.call(hash) }
      hash
    end
    
  end
  
end

################################

# uva specific lib code...
module UVA
  
  module DocExt
    
    # module for handling gis aware docs
    module GIS
      
    end
    
    # module for handling marc based docs
    module Marc
      
      # the actual marc object
      class Base
        def to_s
          "MARC!"
        end
      end
      
      # marc object accessor, memoized
      def marc
        @marc ||= (
          Base.new
        )
      end
      
    end
    
    # common "flag" methods
    module Common
      
      def marc?
        key? 'marc_display'
      end
      
      def fedora?
        key? 'fedora_pid'
      end
      
      def mappable?
        key? 'lat' and key? 'lon'
      end
      
    end
    
  end
  
end

# in the initializer etc..
Blacklight::SolrDoc.decorate do |doc|
  doc.extend UVA::DocExt::Common
  doc.extend UVA::DocExt::GIS if doc.mappable?
  doc.extend UVA::DocExt::Marc if doc.marc?
end

# create some test docs... (the "controller")
docs = []
10.times do |i|
  doc = {'id' => i}
  # "randomize" a bit...
  doc['fedora_pid'] = true if (i % 2 != 0)
  doc['marc_display'] = 'asdf' if i % 3 == 0
  docs << Blacklight::SolrDoc.create(doc)
end

# now go through each doc in the (the "view")
docs.each do |doc|
  # create a doc (decorates the doc)
  puts 'mappable!' if doc.mappable?
  puts 'fedora object!' if doc.fedora?
  puts doc.marc if doc.marc?
end