title: Ignoring certain field when querying in Rails and ActiveRecord
body: <p>I know that I can specify certain fields to query the database with <code>pluck</code>.</p>
  
  <pre><code>ids = Item.where('due_at &lt; ?', 2.days.from_now).pluck(:id)
  </code></pre>
  
  <p>However I would like to know, whether there is a way to specify certain fields I would like to avoid querying from the db. Some kind of anti-pluck?</p>
  
  <pre><code>  posts = Post.where(published: true).do_not_lookup(:enormous_field)
  </code></pre>