n class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">obj</span><span class="ruby-operator">|</span>
      <span class="ruby-keyword">next</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">klass</span>.<span class="ruby-identifier">const_defined?</span>(<span class="ruby-value">:CONTENT_TYPE</span>)
      <span class="ruby-identifier">ext</span> = <span class="ruby-identifier">obj</span>.<span class="ruby-identifier">xlsx_path</