title: rails 4 -- concatenate fields in collection_select
body: <p>I'm working on learning Rails 4 via several tutorials, and building a demo app. </p>
  
  <p>I have a table called <code>players</code> that links to a <code>team</code> table. The team has many players, a player has only one team. So I'm using a <code>collection_select</code> tag to pull the team data into the player form. </p>
  
  <p>It looks like this:</p>
  
  <pre><code>&lt;%= collection_select :player, :team_id, Team.find(:all), :id, :name, options ={:prompt =&gt; "Select a team"} %&gt;
  </code></pre>
  
  <p>This works fine-- but I'd like to have the format look like "Team Name: Team City"-- I can't figure out how to concatenate the <code>:name</code> and <code>:city</code> values in the tag however. Is this possible?</p>