title: Truncate table on migration down method of ActiveRecord Rails 3.1
body: <p>I have the following defined on my <code>up</code> method on my migration to set initial data:</p>
  
  <pre><code>  def up
      Color.create!({:id=&gt;1,:name=&gt;"",:color=&gt;"FF6633"})
      Color.create!({:id=&gt;2,:name=&gt;"",:color=&gt;"93B233"})
      Color.create!({:id=&gt;3,:name=&gt;"",:color=&gt;"4D90D9"})
      Color.create!({:id=&gt;4,:name=&gt;"",:color=&gt;"C43092"})
    end
  </code></pre>
  
  <p>Is there any <code>truncate</code> directive I can put on the <code>down</code> method like:</p>
  
  <pre><code>def down
     Color.truncate
  end
  </code></pre>
  
  <p>Or since I'm setting the IDs on the create should I use only the <code>destroy_all</code> method of the model <code>Color</code> ?</p>