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copied!<p>Actually <code>severin</code> have a better idea, just because usage of method_missing is a bad practice, not all the time, but most of it.</p> <p>One problem with that code provided by <code>severin</code>: it returns value that have been passed to initializer, so you cannot change it. I suggest you a little different approach:</p> <pre><code>class User < Hash def initialize(attrs) attrs.each do |k, v| self[k] = v end end def []=(k, v) unless respond_to?(k) self.class.send :define_method, k do self[k] end end super end end </code></pre> <p>Lets check it:</p> <pre><code>u = User.new(:name => 'John') p u.name u[:name] = 'Maria' p u.name </code></pre> <p>And also you can do it with Struct:</p> <pre><code>attrs = {:name => 'John', :age => 22, :position => 'developer'} keys = attrs.keys user = Struct.new(*keys).new(*keys.map { |k| attrs[k] }) </code></pre> <p>Lets test it:</p> <pre><code>p user p user.name user[:name] = 'Maria' p user.name user.name = 'Vlad' p user[:name] </code></pre> <p>Or even OpenStruct, but be careful it will not create method if it already have it in instance methods, you can look for that by using <code>OpenStruct.instance_methods</code> (because of type is used, I'm now using second approach):</p> <pre><code>attrs = {:name => 'John', :age => 22, :position => 'developer'} user = OpenStruct.new(attrs) </code></pre> <p>Yep, so easy:</p> <pre><code>user.name user[:name] # will give you an error, because OpenStruct isn't a Enumerable or Hash </code></pre>

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