Pastable version of Horrible method to parse a query string and reconstruct it again

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            <pre class="sunburst"><span style="color:#E28964;">def</span> <span style="color:#89BDFF;">link_to_param</span>(<span style="color:#3E87E3;">text<span style="color:#3E87E3;">,</span> param<span style="color:#3E87E3;">,</span> values</span>)
    <span style="color:#3E87E3;"><span style="color:#3E87E3;">@</span>qs</span> <span style="color:#E28964;">||=</span> {}
    <span style="color:#E28964;">if</span> <span style="color:#3E87E3;"><span style="color:#3E87E3;">@</span>qs</span>.<span style="color:#89BDFF;">blank?</span>
      request.<span style="color:#89BDFF;">query_string</span>.<span style="color:#89BDFF;">split</span>(<span style="color:#65B042;"><span style="color:#65B042;">'</span>&amp;<span style="color:#65B042;">'</span></span>).<span style="color:#89BDFF;">each</span> <span style="color:#E28964;">do </span>|<span style="color:#3E87E3;">p</span>|
        pair <span style="color:#E28964;">=</span> p.<span style="color:#89BDFF;">split</span>(<span style="color:#65B042;"><span style="color:#65B042;">'</span>=<span style="color:#65B042;">'</span></span>)
        <span style="color:#3E87E3;"><span style="color:#3E87E3;">@</span>qs</span>[pair[<span style="color:#3387CC;">0</span>]] <span style="color:#E28964;">=</span> pair[<span style="color:#3387CC;">1</span>]
      <span style="color:#E28964;">end</span>
    <span style="color:#E28964;">end</span>

qs <span style="color:#E28964;">=</span> []
    values <span style="color:#E28964;">=</span> [values] <span style="color:#E28964;">unless</span> values.<span style="color:#89BDFF;">is_a?</span>(<span style="color:#3E87E3;">Array</span>)
    
    value <span style="color:#E28964;">=</span> values[<span style="color:#3387CC;">0</span>]
    param_value <span style="color:#E28964;">=</span> values.<span style="color:#89BDFF;">blank?</span> <span style="color:#E28964;">?</span> <span style="color:#65B042;"><span style="color:#65B042;">'</span><span style="color:#65B042;">'</span></span> : <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>param<span style="color:#DAEFA3;">}</span></span>=<span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>values<span style="color:#DAEFA3;">[</span><span style="color:#DDF2A4;">0</span><span style="color:#DAEFA3;">]</span><span style="color:#DAEFA3;">}</span></span><span style="color:#65B042;">&quot;</span></span>

<span style="color:#E28964;">if</span> request.<span style="color:#89BDFF;">parameters</span>[param]
      <span style="color:#E28964;">if</span> values.<span style="color:#89BDFF;">include?</span>(request.<span style="color:#89BDFF;">parameters</span>[param])
        css_class <span style="color:#E28964;">=</span> <span style="color:#65B042;"><span style="color:#65B042;">'</span>current<span style="color:#65B042;">'</span></span>
        
        <span style="color:#3E87E3;"><span style="color:#3E87E3;">@</span>qs</span>.<span style="color:#89BDFF;">each</span> <span style="color:#E28964;">do </span>|<span style="color:#3E87E3;">p</span>, <span style="color:#3E87E3;">v</span>|
          value_idx <span style="color:#E28964;">=</span> <span style="color:#3387CC;">0</span>
          value_idx <span style="color:#E28964;">=</span> request.<span style="color:#89BDFF;">parameters</span>[param] <span style="color:#E28964;">==</span> values[<span style="color:#3387CC;">0</span>] <span style="color:#E28964;">?</span> <span style="color:#3387CC;">1</span> : <span style="color:#3387CC;">0</span> <span style="color:#E28964;">if</span> request.<span style="color:#89BDFF;">parameters</span>[param] <span style="color:#E28964;">==</span> v <span style="color:#E28964;">&amp;&amp;</span> values.<span style="color:#89BDFF;">size</span> <span style="color:#E28964;">&gt;</span> <span style="color:#3387CC;">1</span>
          <span style="color:#E28964;">if</span> p <span style="color:#E28964;">==</span> param
            qs <span style="color:#E28964;">&lt;&lt;</span> <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>p<span style="color:#DAEFA3;">}</span></span>=<span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>values<span style="color:#DAEFA3;">[</span>value_idx<span style="color:#DAEFA3;">]</span><span style="color:#DAEFA3;">}</span></span><span style="color:#65B042;">&quot;</span></span>
          <span style="color:#E28964;">else</span>
            qs <span style="color:#E28964;">&lt;&lt;</span> <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>p<span style="color:#DAEFA3;">}</span></span>=<span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>v<span style="color:#DAEFA3;">}</span></span><span style="color:#65B042;">&quot;</span></span>
          <span style="color:#E28964;">end</span>
        <span style="color:#E28964;">end</span>
      <span style="color:#E28964;">else</span>
        qs <span style="color:#E28964;">&lt;&lt;</span> <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>param<span style="color:#DAEFA3;">}</span></span>=<span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>value<span style="color:#DAEFA3;">}</span></span><span style="color:#65B042;">&quot;</span></span> <span style="color:#E28964;">unless</span> value.<span style="color:#89BDFF;">blank?</span>
        <span style="color:#3E87E3;"><span style="color:#3E87E3;">@</span>qs</span>.<span style="color:#89BDFF;">each</span> <span style="color:#E28964;">do </span>|<span style="color:#3E87E3;">p</span>, <span style="color:#3E87E3;">v</span>|
          qs <span style="color:#E28964;">&lt;&lt;</span> <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>p<span style="color:#DAEFA3;">}</span></span>=<span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>v<span style="color:#DAEFA3;">}</span></span><span style="color:#65B042;">&quot;</span></span> <span style="color:#E28964;">unless</span> p <span style="color:#E28964;">==</span> param
        <span style="color:#E28964;">end</span>
      <span style="color:#E28964;">end</span>
    <span style="color:#E28964;">else</span>
      <span style="color:#E28964;">if</span> value.<span style="color:#89BDFF;">blank?</span>
        css_class <span style="color:#E28964;">=</span> <span style="color:#65B042;"><span style="color:#65B042;">'</span>current<span style="color:#65B042;">'</span></span>
      <span style="color:#E28964;">else</span>
        qs <span style="color:#E28964;">&lt;&lt;</span> <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>param<span style="color:#DAEFA3;">}</span></span>=<span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>value<span style="color:#DAEFA3;">}</span></span><span style="color:#65B042;">&quot;</span></span>
      <span style="color:#E28964;">end</span>
      <span style="color:#3E87E3;"><span style="color:#3E87E3;">@</span>qs</span>.<span style="color:#89BDFF;">each</span> <span style="color:#E28964;">do </span>|<span style="color:#3E87E3;">p</span>, <span style="color:#3E87E3;">v</span>|
        qs <span style="color:#E28964;">&lt;&lt;</span> <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>p<span style="color:#DAEFA3;">}</span></span>=<span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>v<span style="color:#DAEFA3;">}</span></span><span style="color:#65B042;">&quot;</span></span> <span style="color:#E28964;">unless</span> p <span style="color:#E28964;">==</span> param
      <span style="color:#E28964;">end</span>
    <span style="color:#E28964;">end</span>
 
    qs <span style="color:#E28964;">=</span> qs.<span style="color:#89BDFF;">sort</span>.<span style="color:#89BDFF;">join</span>(<span style="color:#65B042;"><span style="color:#65B042;">'</span>&amp;<span style="color:#65B042;">'</span></span>)
    link_to text, <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span>?<span style="color:#DAEFA3;"><span style="color:#DAEFA3;">#{</span>qs<span style="color:#DAEFA3;">}</span></span><span style="color:#65B042;">&quot;</span></span>, <span style="color:#3387CC;"><span style="color:#3387CC;">:</span>class</span> =&gt; css_class
  <span style="color:#E28964;">end</span>
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