title: Simple form association custom label name
body: <p>I have been struggling with what I perceive to be a simple problem:</p>
  
  <p>Working in Rails 3.0.8 with the simple_form 1.4 gem.</p>
  
  <p>I have two models, owners and owner_types;  </p>
  
  <pre><code>class Owner &lt; ActiveRecord::Base
    belongs_to :own_type
    attr_accessible :name, :own_type_id
  end
  
  class OwnerType &lt; ActiveRecord::Base
    has_many :owners
    attr_accessible :name, :subtype_name
  end
  </code></pre>
  
  <p>In my the _form partial of the Owner view, I want to have a select box that displays both the name and subtype_name of the owner_type association.<br>
     ....something like this:  Owner Type:   [name | subtype_name] eg. [Government | Federal];    [Government | Municipal] </p>
  
  <p>My view now contains: app/views/owners/_form.html.erb</p>
  
  <pre><code>&lt;%= simple_form_for @owner do |f| %&gt;
    &lt;%= f.error_messages %&gt;
    &lt;%= f.input :name %&gt;
    &lt;%= f.association :owner_type, :include_blank =&gt; false %&gt;
    &lt;%= f.button :submit %&gt;
  &lt;% end %&gt;
  </code></pre>
  
  <p>...the f.association only list the owner_type.name field by default. How do you specify different fields, or in my case two fields?</p>
  
  <p>All help is appreciated; thanks in advance.</p>
  
  <p>DJ </p>