title: Update row data with a new value per row using fluentmigrator
body: <p>I am using fluentmigrator to add a new column to a table. I then want to update each row in the table with a unique value for that column.</p>
  
  <p>Currently when I use:</p>
  
  <pre><code>Update.Table("Foo").InSchema("dbo").Set(new { Bar = Bar.Generate() }).AllRows();
  </code></pre>
  
  <p>It gives the same value for all the rows.</p>
  
  <p>How do I ensure it calls that method for each row?</p>