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<h3><a class="ablack" href="updates-improve-the-attachments-system.html">
Updates: Improve the Attachments system
</a></h3>
<!-- bashblog_timestamp: #202108051337.42# -->
<div class="subtitle">August 05, 2021 &mdash; 
GNU social development team
</div>
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<p>With the milestone <a href="https://www.gnusocial.rocks/v3/milestone-port-media-handling-from-v2.html">Port Media system from
v2</a> we had ported the existing
attachment system. The fact is that this system wasn't good enough.</p>

<p>It's always important to start with the original code as that allows us
to review past decisions and understand all the corner cases previously
considered.</p>

<p>Sadly, what motivated us to re-design the attachment system were the
non-considered corner cases. In particular:</p>

<ul>
<li>Remove <code>title</code> from attachment, as it's part of the relation between attachment and note.</li>
<li>Remove <code>actor</code> from attachment, many actors may publish the same attachment.</li>
<li>Remove <code>is_local</code> from attachment,  as it's part of the relation between attachment and note.</li>
<li>Remove <code>remote_url</code> from attachment, different urls can return the same attachment.</li>
<li>Attachment now has a reference counter </li>
<li>Add entity GSActorToAttachment</li>
<li>Add entity GSActorToRemoteURL</li>
<li>Add entity RemoteURL</li>
<li>Add entity RemoteURLToNote</li>
<li>Add entity RemoteURLToAttachment</li>
<li>AttachmentToNote now has a title attribute</li>
</ul>

<p>Key commits:</p>

<ul>
<li><a href="https://code.undefinedhackers.net/GNUsocial/gnu-social/commit/32ad5dbd74ebb369c4b3ed688e1fb78464fabe49">32ad5dbd74 - [ENTITY] Split Attachment in various new entities</a></li>
<li><a href="https://code.undefinedhackers.net/GNUsocial/gnu-social/commit/c381e58d3307e7dd07abeb9cf5b3998e34f5bd48">c381e58d33 - [ENTITY] Refactor RemoteURL entities to Link</a></li>
</ul>

<p>The structural changes and how it compares to v2 is detailed in our
<a href="http://agile.gnusocial.rocks/doku.php?id=attachment">wiki</a>.</p>

<p>Some relevant observations:</p>

<ul>
<li><code>Link</code> is now part of GNU social Data Representation terms. It represents
any remote URL being shared in a note.</li>
<li>There's only one fixed directory for GSFiles.</li>
</ul>


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