title: How to chain or from Arel Array
body: <p>I read <a href="https://stackoverflow.com/a/13754977/1979953">https://stackoverflow.com/a/13754977/1979953</a>.</p>
  
  <pre><code>user = User.arel_table
  
  u1 = user[:id].eq(1)
  u2 = user[:id].eq(2)
  u3 = user[:id].eq(3)
  
  result = User.where(u1.or(u2).or(u3))
  </code></pre>
  
  <p>is ok.</p>
  
  <p>How to chain like above? use <code>each</code> or <code>map</code> etc.</p>
  
  <pre><code>user = User.arel_table
  
  foo = [
    user[:id].eq(1),
    user[:id].eq(2),
    user[:id].eq(3)
  ]
  
  result = foo.map{|o| ??? }
  </code></pre>