title: Rails 'returning' method - One-liner to build Array from Multiple Arrays in Ruby?
body: <p>How do I convert the following to a clear one-liner in ruby?</p>
  
  <pre><code>def questions
    results = []
    sections.each do |section|
      results = results.concat(Question.find_all_by_survey_section_id(section.id))
    end
    results
  end
  </code></pre>
  
  <p>I feel like I could use the <code>&amp;:</code> (<code>Symbol#to_proc</code>) and <code>returning</code> methods in there somehow.</p>