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copied!<p>Why not add a list of allowed users to each file system object</p> <p>Adding permissions for a user is easy</p> <pre><code>db.collection.update({folderOrFileNameAndLocation : 'products'}, {$push: {allowedUsers: 'Joe'}}) </code></pre> <p>Removing users is easy</p> <pre><code>db.collection.update({folderOrFileNameAndLocation : 'products'}, {$pull: {allowedUsers: 'Joe'}}) </code></pre> <p>Checking permissions is easy</p> <pre><code>db.collection.find({folderOrFileNameAndLocation : 'products', allowedUsers : 'Joe'}) </code></pre> <p>And listing everything accessible to the user is easy</p> <pre><code>db.collection.find({allowedUsers: 'Joe'}, {folderOrFileNameAndLocation: 1, _id: 0}) </code></pre> <p>One thing that you might find helpful is to build out your files and folders as a tree as opposed to having the location be a string. So you'll have</p> <pre><code>$collection->insert(array( '_id' => new MongoID(), 'type' => 'folder', 'folderOrFileName' => 'products' )); </code></pre> <p>Then to create a subfolder:</p> <pre><code>$collection->find(array('folderOrFileName' => 'products')); $collection->insert(array( '_id' => new MongoID(), 'type' => 'folder', 'folderOrFileName' => 'device', 'parent' => $collection['_id'] )); </code></pre> <p>There are pluses and minuses to that structure; depending on what else you need to support you might find your way or the tree way easier. But I would definitely recommend assigning user names to folders instead of vice versa.</p>

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