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POAdd a non-literal hash element to Ruby's last-argument magic hashes?
 

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    <p>Many Rails helpers use an idiomatic options hash as their last argument; Ruby automatically inserts extra method arguments into that hash. I often find myself wanting to conditionally insert an element, or to write a helper that provides the element. Two examples in pseudo-Ruby:</p> <pre><code>link_to "Example 1", "http://www.example.com", needs_confirmation? ? :confirm =&gt; "Are you sure?" : nil # syntax error; nil can't be a hash element </code></pre> <p>or</p> <pre><code>link_to "Example 2", "http://www.example.com", unique_link_id # I don't want to return a hash; I want to return an element of a hash def unique_link_id :id =&gt; "our_link_#{user.id}" # Syntax error {:id =&gt; "our_link_#{user.id}"} # valid, but returns a hash that ends up being an element of the options hash {:id =&gt; "our_link_#{user.id}"}.flatten_into_my_parent_hash # What's in my brain end </code></pre> <p>Is there some elegant way to do this? I can't control the Rails helpers, obviously, so I can't force them to flatten the hash. (Er, not that there's a <code>Hash#flatten</code> method, but even if there were.)</p> <p>I can build the hash as a variable before the method call, of course, and optionally add elements, but... ick.</p> <p>Let's stipulate that these are contrived examples, and assume that the helpers wouldn't allow <code>:confirm =&gt; nil</code> or <code>:id =&gt; nil</code>, and that <code>unique_link_id</code> might want to leave off the ID. I'm more interested in the hash syntax than in solving a Rails problem.</p> <p>Anyone? </p>
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