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    <p>I think you should try something like the following:</p> <pre><code>link_to "Example 1", "http://www.example.com", :confirm =&gt; needs_confirmation? ? "Are you sure?" : nil </code></pre> <p>And for the second case you could in a similar say the following:</p> <pre><code>link_to "Example 2", "http://www.example.com", :id=&gt;unique_link_id </code></pre> <p>Note: unique_link_id should return a string (or nil if you dont want to have an id)</p> <p>To answer your question in general you need to understand how rails treats these parameters that you pass in a method (such as a helper).</p> <p>Most rails helpers start like this:</p> <pre><code>def a_helper(*args) options = args.extract_options! ... end </code></pre> <p>What you should know about the above: It is assumed that an Array is passed in as parameter. All of the :something=>value that you also add are converted into a hash which is the last element of this array. So <code>extract_options!</code> separates the normal parameters from the hash options. So in order what you want to work, <em>all</em> options should be in <em>one</em> hash in the end.</p> <p>To make a long story sort here is an example of what you should do:</p> <pre><code> link_to "Example 1", "http://www.example.com",{:confirm=&gt;"Are you sure?"}.merge(unique_link_id) </code></pre> <p>In this case <code>unique_link_id</code> returns a hash and is merged with the other options. If <code>unique_link_id</code> returns an empty hash(<code>{}</code>) nothing is added to your options and everyone is happy :) </p> <p>If your options get too complicated i suggest that you create an options variable before calling the helper (or method) you wish. <code>options</code> should be a hash merged with other hashes as many times as you wish before you pass it as the last parameter to your method. </p> <p>Tip: very useful hash functions are hash.merge(), hash.merge!() and hash.reverse_merge()</p>
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    1. POAdd a non-literal hash element to Ruby's last-argument magic hashes?
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    1. COThanks. That solves these particular problems, but not the overall question; edited the question to clarify what I'm looking for.
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      1. USJay Levitt
    2. CODidn't realize you'd edited it, and yes, the second part of the answer is exactly what I wanted - {}.merge gets me not just :id => unique_link_id, but unique_link_id on its own. Perfect.
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