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PORuby/Rails Method Help
 

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  1. PORuby/Rails Method Help
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    <p>So, I'm pretty much a newbie at creating ruby methods. I've got the following method from a gem (meta_search), but I need to change the default behavior. Here's the method:</p> <pre><code>def sort_link(builder, attribute, *args) raise ArgumentError, "Need a MetaSearch::Builder search object as first param!" unless builder.is_a?(MetaSearch::Builder) attr_name = attribute.to_s name = (args.size &gt; 0 &amp;&amp; !args.first.is_a?(Hash)) ? args.shift.to_s : builder.base.human_attribute_name(attr_name) prev_attr, prev_order = builder.search_attributes['meta_sort'].to_s.split('.') current_order = prev_attr == attr_name ? prev_order : nil new_order = current_order == 'asc' ? 'desc' : 'asc' options = args.first.is_a?(Hash) ? args.shift : {} html_options = args.first.is_a?(Hash) ? args.shift : {} css = ['sort_link', current_order].compact.join(' ') html_options[:class] = [css, html_options[:class]].compact.join(' ') options.merge!( builder.search_key =&gt; builder.search_attributes.merge( 'meta_sort' =&gt; [attr_name, new_order].join('.') ) ) link_to [ERB::Util.h(name), order_indicator_for(current_order)].compact.join(' ').html_safe, url_for(options), html_options end </code></pre> <p>This method returns a sort link for a search. The output looks like this:</p> <pre><code>&lt;a class="sort_link asc" href="/photos?search[meta_sort]=average_rating.desc"&gt;Best Photography ▲&lt;/a&gt; </code></pre> <p>Here's the problem: this method assumes that you want to sort in ascending order on the first click, and descending order on the second. I want the opposite behavior. I see that I could change this...</p> <pre><code>new_order = current_order == 'asc' ? 'desc' : 'asc' </code></pre> <p>to this...</p> <pre><code>new_order = current_order == 'desc' ? 'asc' : 'desc' </code></pre> <p>...but that just reverses the situation. What I really need is to be able to specify an option and reverse the behavior if that option is passed.</p> <p>So here's my problem: I don't really understand how the *args are passed. From what I can tell these lines are taking the option and html_option hashes for rails link_to method...</p> <pre><code>options = args.first.is_a?(Hash) ? args.shift : {} html_options = args.first.is_a?(Hash) ? args.shift : {} </code></pre> <p>What I'd like to do is add a custom option to the options hash, and if that option is defined reverse the sort equation. I tried to do this...</p> <pre><code>if defined? options[:sort_preference] &amp;&amp; options[:sort_preference]==:desc new_order = current_order == 'desc' ? 'asc' : 'desc' options.delete(:sort_preference) else new_order = current_order == 'asc' ? 'desc' : 'asc' options.delete(:sort_preference) end </code></pre> <p>... but that didn't work, it just kept the standard behavior and passed :sort_preference into the URL like so:</p> <pre><code>&lt;a class="sort_link asc" href="/photos?search[meta_sort]=average_rating.desc&amp;sort_preference=desc"&gt;Best Photography ▲&lt;/a&gt; </code></pre> <p>In the link above, <code>sort_preference</code> shouldn't appear in the URL, and <code>search[meta_sort]</code> should be <code>average_rating.asc</code> -- since the link shows the opposite of what rendered.</p> <p>So, obviously, my attempt didn't work because I don't really understand what's going on in this method. What I'm hoping for in answer to this question is:</p> <ul> <li>A little help understanding how *args works</li> <li>An explanation of why my attempt to add an option to this method failed</li> <li>An example of how to fix it</li> </ul> <p>Thank you very much for taking a look!</p>
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