<h1 class="title">Base class for attachments on external object store</h1> <p>This is a base addon that regroup common code used by addons targeting specific object store</p> <a name="configuration"></a> <h2>Configuration</h2> <p>Object storage may be slow, and for this reason, we want to store some files in the database whatever.</p> <p>Small images (128, 256) are used in Odoo in list / kanban views. We want them to be fast to read. They are generally &lt; 50KB (default configuration) so they don't take that much space in database, but they'll be read much faster than from the object storage.</p> <p>The assets (application/javascript, text/css) are stored in database as well whatever their size is:</p> <ul class="simple"> <li>a database doesn't have thousands of them</li> <li>of course better for performance</li> <li>better portability of a database: when replicating a production instance for dev, the assets are included</li> </ul> <p>This storage configuration can be modified in the system parameter <code>ir_attachment.storage.force.database</code>, as a JSON value, for instance:</p> <pre> <code>{&quot;image/&quot;: 51200, &quot;application/javascript&quot;: 0, &quot;text/css&quot;: 0}</code> </pre> <p>Where the key is the beginning of the mimetype to configure and the value is the limit in size below which attachments are kept in DB. 0 means no limit.</p> <p>Default configuration means:</p> <ul class="simple"> <li>images mimetypes (image/png, image/jpeg, ...) below 50KB are stored in database</li> <li>application/javascript are stored in database whatever their size</li> <li>text/css are stored in database whatever their size</li> </ul>