title: How to disable specific value in dropdown select with simple_form?
body: <p>I am using simple_form in my rails application. I want to disable a particular value in drop-down.</p>
  
  <p>Here is part of the code</p>
  
  <pre><code>= simple_form_for(@organization,url: admin_organization_path) do |f| 
   = f.input :hospital_name, input_html: { class: "form-control"}
   = f.input :parent, collection: @organizations, input_html: { class: "form-control", id: "chosen-select-speciality"}  
  </code></pre>
  
  <p>I tried using <code>:disabled =&gt; @organizations.first</code> but i was failed.
  Is there any other method to use.Kindly help me. thanks.</p>