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copied!<p>I'll assume 2 things:</p> <ul> <li>That you are the <code><%= form_for @model_instance</code> idiom (explained on section 2.2 of <a href="http://guides.rubyonrails.org/form_helpers.html" rel="noreferrer">this guide</a>).</li> <li>That you want to store the "hot", "medium" and "cold" values as strings (not as numbers 1,2 and 3 or something similar) on your database.</li> </ul> <p>Let's say that you have two fields, called <code>:name</code> and <code>:temperature</code>, controlled by two <code>text_fields</code>: </p> <pre><code><% form_for @article do |f| %> <%= f.text_field :name %> <%= f.text_field :temperature %> <%= f.submit "Create" %> <% end %> <% end %> </code></pre> <p>Now you want to change the :temperature control to a dropdown list, accepting hot, medium and cold as values. Then you can do that this way:</p> <pre><code><% form_for @article do |f| %> <%= f.text_field :name %> <%= f.collection_select :temperature, Article::TEMPERATURES, :to_s, :to_s, :include_blank => true %> <%= f.submit "Create" %> <% end %> <% end %> </code></pre> <p>You will now have to define the <code>Article::TEMPERATURES</code> constant in your Article model. It shouldn't be very difficult:</p> <pre><code>class Article < Activerecord::Base TEMPERATURES = ['hot', 'medium', 'cold'] </code></pre> <p>You may be wondering why I added the <code>:include_blank</code> part on the <code>collection_select</code>. This will add an "empty" option on your dropdown list. You will need that empty option when creating new objects, unless you want a "default" value to temperature.</p>

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