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13112196
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2012-10-28T19:23:13.857
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2012-10-28T19:34:06.023
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2012-10-28T19:34:06.023
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13111006
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The functionality you want fits naturally into Enumerable's select, which Array inherits. Because you're talking about a list, AKA, array, it's a natural fit to use select to determine whether your movies meet your criteria by building upon that, instead of passing them into a method. A separate Filter class will not fit the Ruby-way as well. Consider sub-classing Array for your movie list, and adding a filter method that takes your criteria as parameters. Here's how I'd write that functionality, but doing it in a way I consider more Ruby-like: <pre><code>require 'pp' class Movies < Array def initialize(*movies) super(movies) end def filter(criteria={}) self.select{ |m| criteria.all?{ |c, v| m.send(c, v) } } end end class Movie def initialize(attributes={}) @movie = attributes end def name(t) case t when Regexp @movie[:name][t] when String @movie[:name] == t end end def genre(g) @movie[:genre] == g end def year(y) @movie[:year] == y end end movies = Movies.new( Movie.new(name: 'Batman', genre: 'Drama', year: 2001), Movie.new(name: 'The Shawshank Redemption', genre: 'Drama', year: 1994), Movie.new(name: 'Raiders of the Lost Ark', genre: 'Action', year: 1981) ) pp movies.filter(year: 1981) pp movies.filter(genre: 'Drama', year: 2001) pp movies.filter(name: /redemption/i) </code></pre> I used a hash for the Movie class, because it's quicker. It's also a dirtier way to go, but it works. Here's the output of running the code: <pre><code>[#<Movie:0x007ff7b191ffb8 @movie={:name=>"Raiders of the Lost Ark", :genre=>"Action", :year=>1981}>] [#<Movie:0x007ff7b1920260 @movie={:name=>"Batman", :genre=>"Drama", :year=>2001}>] [#<Movie:0x007ff7b19200d0 @movie={:name=>"The Shawshank Redemption", :genre=>"Drama", :year=>1994}>] </code></pre> The actual flow of filtering the movies fits into how we normally write Ruby code. It could be done even better, but that's a start.
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