diff --git a/app/Conductors/ArticleConductor.php b/app/Conductors/ArticleConductor.php
index a1a10ea..7fe68f6 100644
--- a/app/Conductors/ArticleConductor.php
+++ b/app/Conductors/ArticleConductor.php
@@ -125,7 +125,7 @@ class ArticleConductor extends Conductor
     public function includeAttachments(Model $model)
     {
         return $model->getAttachments()->map(function ($attachment) {
-            return MediaConductor::includeModel(request(), 'attachments', $attachment->getMedia());
+            return MediaConductor::includeModel(request(), 'attachments', $attachment->media);
         });
     }
 
@@ -138,7 +138,7 @@ class ArticleConductor extends Conductor
     public function includeGallery(Model $model)
     {
         return $model->getGallery()->map(function ($item) {
-            return MediaConductor::includeModel(request(), 'gallery', $item->getMedia());
+            return MediaConductor::includeModel(request(), 'gallery', $item->media);
         });
     }
 
diff --git a/app/Conductors/EventConductor.php b/app/Conductors/EventConductor.php
index 1f3d442..7558a40 100644
--- a/app/Conductors/EventConductor.php
+++ b/app/Conductors/EventConductor.php
@@ -110,7 +110,7 @@ class EventConductor extends Conductor
 
         return $model->getAttachments()->map(function ($attachment) use ($user) {
             if ($attachment->private === false || ($user !== null && $user->hasPermission('admin/events') === true)) {
-                return MediaConductor::includeModel(request(), 'attachments', $attachment->getMedia());
+                return MediaConductor::includeModel(request(), 'attachments', $attachment->media);
             }
         });
     }
diff --git a/app/Models/Attachment.php b/app/Models/Attachment.php
index 7bf6574..37848f8 100644
--- a/app/Models/Attachment.php
+++ b/app/Models/Attachment.php
@@ -46,10 +46,41 @@ class Attachment extends Model
      *
      * @return null|Media
      */
-    public function getMedia(): ?Media
+    public function getMediaAttribute(): ?Media
     {
-        return Cache::remember("attachment:{$this->id}:media", now()->addDays(28), function () {
+        $mediaId = '0';
+        $media = null;
+
+        if (Cache::has("attachment:{$this->id}:media") === true) {
+            $mediaId = Cache::get("attachment:{$this->id}:media");
+        } else {
+            $media = $this->media()->first();
+            if ($media === null) {
+                return null;
+            }
+
+            $mediaId = $media->id;
+            Cache::put("attachment:{$this->id}:media", $mediaId, now()->addDays(28));
+        }
+
+        return Cache::remember("media:{$mediaId}", now()->addDays(28), function () use ($media) {
+            if ($media !== null) {
+                return $media;
+            }
+
             return $this->media()->first();
         });
     }
+
+    /**
+     * Set the media for this item.
+     *
+     * @param Media $media The media model.
+     * @return void
+     */
+    public function setMediaAttribute(Media $media): void
+    {
+        $this->media()->associate($media)->save();
+        Cache::put("attachment:{$this->id}:media", $media->id, now()->addDays(28));
+    }
 }
diff --git a/app/Models/Gallery.php b/app/Models/Gallery.php
index 855a3ff..c453af8 100644
--- a/app/Models/Gallery.php
+++ b/app/Models/Gallery.php
@@ -67,7 +67,7 @@ class Gallery extends Model
      *
      * @return null|Media The media model.
      */
-    public function getMedia(): ?Media
+    public function getMediaAttribute(): ?Media
     {
         $mediaId = '0';
         $media = null;
@@ -92,4 +92,16 @@ class Gallery extends Model
             return $this->media()->first();
         });
     }
+
+    /**
+     * Set the media for this item.
+     *
+     * @param Media $media The media model.
+     * @return void
+     */
+    public function setMediaAttribute(Media $media): void
+    {
+        $this->media()->associate($media)->save();
+        Cache::put("gallery:{$this->id}:media", $media->id, now()->addDays(28));
+    }
 }
diff --git a/app/Models/User.php b/app/Models/User.php
index d1538ad..ea17138 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -103,9 +103,9 @@ class User extends Authenticatable implements Auditable
     /**
      * Get the list of permissions of the user
      *
-     * @return Illuminate\Database\Eloquent\Collection
+     * @return Illuminate\Database\Eloquent\Relations\HasMany
      */
-    public function permissions(): Collection
+    public function permissions(): HasMany
     {
         return $this->hasMany(Permission::class);
     }
@@ -123,6 +123,23 @@ class User extends Authenticatable implements Auditable
         });
     }
 
+    /**
+     * Set the permission attribute
+     *
+     * @param array $newPermissions The new permissions to set to the user.
+     * @return void
+     */
+    public function setPermissionsAttribute(array $newPermissions): void
+    {
+        $existingPermissions = $this->permissions->pluck('permission')->toArray();
+
+        $this->revokePermission(array_diff($this->permissions, $newPermissions));
+        $this->givePermission(array_diff($newPermissions, $this->permissions));
+
+        $cacheKey = "user:{$this->id}:permissions";
+        Cache::delete($cacheKey);
+    }
+
     /**
      * Test if user has permission
      *
@@ -146,19 +163,14 @@ class User extends Authenticatable implements Auditable
             $permissions = [$permissions];
         }
 
-        $permissions = collect($permissions)->map(function ($permission) {
+        $newPermissions = array_map(function ($permission) {
             return ['permission' => $permission];
-        });
-
-        $existingPermissions = $this->permissions;
-        $newPermissions = $permissions->reject(function ($permission) use ($existingPermissions) {
-            return $existingPermissions->contains('permission', $permission['permission']);
-        });
+        }, array_diff($permissions, $this->permissions));
 
         $cacheKey = "user:{$this->id}:permissions";
         Cache::forget($cacheKey);
 
-        return $this->permissions()->createMany($newPermissions->toArray());
+        return $this->permissions()->createMany($newPermissions);
     }