by-constant">RubyXL</span><span class="ruby-operator">::</span><span class="ruby-constant">ContentTypeOverride</span>.<span class="ruby-identifier">new</span>(<span class="ruby-value">:part_name</span>    <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">obj</span>.<span class="ruby-identifier">xlsx_path</span>,
                                                   <span class="ruby-value">:content_type</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">obj_conte