<div dir="ltr">Hi,<div><br></div><div>Do you know how we should handle adding an attribute to serialized object.</div><div><br></div><div>We are doing some customizations and we would like to add content_type to </div><div><table class="" style="border-collapse:collapse;border-spacing:0px;color:rgb(51,51,51);font-family:Helvetica,arial,nimbussansl,liberationsans,freesans,clean,sans-serif,'Apple Color Emoji','Segoe UI Emoji','Segoe UI Symbol';font-size:13px;line-height:18.2px"><tbody><tr></tr><tr><td id="LC665" class="" style="padding:0px 10px;vertical-align:top;font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;white-space:pre;overflow:visible;word-wrap:normal"><span class="" style="color:rgb(167,29,93)">class</span> <span class="" style="color:rgb(121,93,163)">HTMLLogFile</span>(<span class="" style="color:rgb(121,93,163)">styles</span>.<span class="" style="color:rgb(121,93,163)">Versioned</span>, <span class="" style="color:rgb(121,93,163)">LogFile</span>):</td></tr><tr><td id="L666" class="" style="padding:0px 10px;width:50px;min-width:50px;white-space:nowrap;font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:18px;color:rgba(0,0,0,0.298039);vertical-align:top;text-align:right;border-style:solid;border-color:rgb(238,238,238);border-width:0px 1px 0px 0px"></td></tr></tbody></table></div><div><br></div><div>so we increased the </div><table class="" style="border-collapse:collapse;border-spacing:0px;color:rgb(51,51,51);font-family:Helvetica,arial,nimbussansl,liberationsans,freesans,clean,sans-serif,'Apple Color Emoji','Segoe UI Emoji','Segoe UI Symbol';font-size:13px;line-height:18.2px"><tbody><tr><td id="LC667" class="" style="padding:0px 10px;vertical-align:top;font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;white-space:pre;overflow:visible;word-wrap:normal"><br class="">    persistenceVersion <span class="" style="color:rgb(167,29,93)">=</span> <span class="" style="color:rgb(0,134,179)">2
<br></span></td></tr></tbody></table><div>and added the </div><div><br></div><div><span class="" style="color:rgb(167,29,93);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre">def</span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre;background-color:rgb(248,238,199)"> </span><span class="" style="color:rgb(121,93,163);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre">upgradeToVersion2</span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre;background-color:rgb(248,238,199)">(</span><span class="" style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre">self</span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre;background-color:rgb(248,238,199)">):</span><br></div><div><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre">        </span><span class="" style="color:rgb(237,106,67);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre">self</span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre">.content_type </span><span class="" style="color:rgb(167,29,93);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre">=</span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre"> </span><span class="" style="color:rgb(24,54,145);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre"><span class="">'</span><span class="">'</span></span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre;background-color:rgb(248,238,199)"><br></span></div><div><span class="" style="color:rgb(24,54,145);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre"><span class=""><span style="color:rgb(51,51,51);line-height:16.8px">        </span><span class="" style="color:rgb(237,106,67);line-height:16.8px">self</span><span style="color:rgb(51,51,51);line-height:16.8px">.wasUpgraded </span><span class="" style="color:rgb(167,29,93);line-height:16.8px">=</span><span style="color:rgb(51,51,51);line-height:16.8px"> </span><span class="" style="color:rgb(0,134,179);line-height:16.8px">True</span><br></span></span></div><div><span class="" style="color:rgb(24,54,145);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre"><span class=""><span class="" style="color:rgb(0,134,179);line-height:16.8px"><br></span></span></span></div><div><span class="" style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.8px;white-space:pre"><span class=""><span class="" style="line-height:16.8px"><div style="font-family:arial,sans-serif;font-size:small;line-height:normal;white-space:normal">But we got an error if we want to run buildbot on a different branch that uses <span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;white-space:pre;line-height:18.2px">persistenceVersion </span><span class="" style="color:rgb(167,29,93);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;white-space:pre;line-height:18.2px">=</span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;white-space:pre;line-height:18.2px"> </span><span style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;white-space:pre;line-height:18.2px"><font color="#0086b3">1</font></span></div><div style="font-family:arial,sans-serif;font-size:small;line-height:normal;white-space:normal"><span style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;white-space:pre;line-height:18.2px"><font color="#0086b3"><br></font></span></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;line-height:normal;white-space:normal"><span style="color:rgb(44,45,48);font-family:Slack-Lato,appleLogo,sans-serif;font-size:15px;line-height:22px;background-color:rgb(249,249,249)">the exception is thrown from this library</span><span class="" style="display:block;height:0.5rem;color:rgb(44,45,48);font-family:Slack-Lato,appleLogo,sans-serif;font-size:15px;line-height:22px;background-color:rgb(249,249,249)"><i class="" style="display:inline-block;vertical-align:baseline;height:0px;font-size:0px;color:transparent;float:left;background-repeat:no-repeat"><br></i></span><span style="color:rgb(44,45,48);font-family:Slack-Lato,appleLogo,sans-serif;font-size:15px;line-height:22px;background-color:rgb(249,249,249)">twisted/persisted/styles.py:400 in versionUpgrade </span><br style="color:rgb(44,45,48);font-family:Slack-Lato,appleLogo,sans-serif;font-size:15px;line-height:22px;background-color:rgb(249,249,249)"><span style="color:rgb(44,45,48);font-family:Slack-Lato,appleLogo,sans-serif;font-size:15px;line-height:22px;background-color:rgb(249,249,249)">assert persistVers <=  currentVers, "Sorry, can't go backwards in time."</span><br></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;line-height:normal;white-space:normal"><br></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;line-height:normal;white-space:normal">Do you know how this should be handled?, it looks like we are missing/not handle something?</div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;line-height:normal;white-space:normal"><br></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;line-height:normal;white-space:normal">Thanks!</div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;line-height:normal;white-space:normal">Maria</div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;line-height:normal;white-space:normal"><br></div></span></span></span></div></div>