title: simple_form without model and select box
body: <p>I'm trying to create select which will be used just for search
  form not be posted directly to the server here is the code from view:</p>
  
  <pre><code>= simple_form_for :tags, url: '#' do |f|
    = f.input 'id[]', collection: @tags
  </code></pre>
  
  <p><strong>@tags is just Active relation</strong> - tags which comes from <strong>acts-as-taggable-on</strong>
  here is my code from controller:</p>
  
  <pre><code>@tags = project.user_statuses.tag_counts_on(:tags)
  </code></pre>
  
  <p>from console looks like:</p>
  
  <pre><code>[#&lt;ActsAsTaggableOn::Tag id: 1, name: "amazing"&gt;, 
   #&lt;ActsAsTaggableOn::Tag id: 2, name: "bfc-release"&gt;,
   #&lt;ActsAsTaggableOn::Tag id: 3, name: "demo"&gt;,
   #&lt;ActsAsTaggableOn::Tag id: 4, name: "awesome"&gt;,
   #&lt;ActsAsTaggableOn::Tag id: 5, name: "project1"&gt;]
  </code></pre>
  
  <p>but I get 
      undefined method `id[]' for #
  in my view. what I'm doing wrong?</p>