GitHub - timon/acts_as_range_set: store a range of objects as one AR::B row

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autotest		autotest
lib		lib
spec		spec
tasks		tasks
test		test
MIT-LICENSE		MIT-LICENSE
README		README
Rakefile		Rakefile
init.rb		init.rb
install.rb		install.rb
uninstall.rb		uninstall.rb

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= ActsAsRangeSet

ActsAsRangeSet allows you to store ranges of values using a single row.

== Example
  # movie_still_frames table should have at least from_time, to_time and movie_name fields
  class MovieStillFrame < ActiveRecord::Base
    acts_as_range_set :on => time, :scope => :movie_name, :precision => 0.04 # Standard for 25 fps

    def filename_for(time)
      frame = "%02d" % (time.to_f.frac / 0.04) 
       "/movies/#{movie_name.underscore}/#{time.to_i}_#{frame}.jpg"
    end
  end
  
  @sample = MovieStillFrame.create(:movie_name => "Very Scary Movie", :time => (0..10.minutes))
  @sample2 = MovieStillFrame.create(:movie_name => "Very Scary Movie", :time => (10.minutes..20.minutes))

Note that <tt>@sample2.time</tt> now is <tt>0..20.minutes</tt>. As will <tt>@sample</tt> after reload.
   @sample2.filename_for(15.minutes) # => "/movies/Very Scary Movie/900_00.jpg"

And you don't have to keep 30,000 rows for each frame ;)

Copyright (c) 2008 Artem Ignatiev, released under the MIT license