diff --git a/app/Http/Controllers/Oai/RequestController.php b/app/Http/Controllers/Oai/RequestController.php
index 1a56d38..ea06835 100644
--- a/app/Http/Controllers/Oai/RequestController.php
+++ b/app/Http/Controllers/Oai/RequestController.php
@@ -148,7 +148,7 @@ class RequestController extends Controller
         $repositoryName = "RDR - Data Research Repository";
         $repIdentifier = "rdr.gba.ac.at";
         $sampleIdentifier = "oai:" . $repIdentifier . ":27";//$this->_configuration->getSampleIdentifier();
-        $earliestDateFromDb = Dataset::earliestPublicationDate()->get('server_date_published');
+        $earliestDateFromDb = optional(Dataset::earliestPublicationDate())->server_date_published;
 
         // set parameters for oai-pmh.xslt
         $this->_proc->setParameter('', 'email', $email);
diff --git a/database/migrations/2019_08_29_150721_create_mime_types_table.php b/database/migrations/2019_08_29_150721_create_mime_types_table.php
new file mode 100644
index 0000000..3bc4d8d
--- /dev/null
+++ b/database/migrations/2019_08_29_150721_create_mime_types_table.php
@@ -0,0 +1,34 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateMimeTypesTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('mime_types', function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('name', 255);
+            $table->string('file_extension', 255);
+            $table->boolean('enabled')->default(false);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('mime_types');
+    }
+}
diff --git a/database/seeds/DatabaseSeeder.php b/database/seeds/DatabaseSeeder.php
index d21468e..bc7577a 100755
--- a/database/seeds/DatabaseSeeder.php
+++ b/database/seeds/DatabaseSeeder.php
@@ -23,7 +23,7 @@ class DatabaseSeeder extends Seeder
    
         // $this->call('CategoryTableSeeder');
         // $this->call('BookTableSeeder');
-        // $this->call('PeriodeTableSeeder');
+        $this->call('MimetypeTableSeeder');
         $this->call('AccountsTableSeeder');
         $this->call('RolesTableSeeder');
         $this->call('LicencesTableSeeder');
@@ -33,67 +33,6 @@ class DatabaseSeeder extends Seeder
     }
 }
 
-
-
-class PeriodeTableSeeder extends Seeder
-{
-    public function run()
-    {
-        // DB::table('users')->delete();
-
-        // User::create([
-        // 'name' => str_random(10),
-        // 'email' => 'foo@gmail.com',
-        // 'password' => bcrypt('secret')
-        // ]);
-        DB::table('periodes')->insert([
-            'id' => '1',
-            'days' => '100',
-            
-        ]);
-    }
-}
-
-class CategoryTableSeeder extends Seeder
-{
-    public function run()
-    {
-        // DB::table('users')->delete();
-
-        // User::create([
-        // 'name' => str_random(10),
-        // 'email' => 'foo@gmail.com',
-        // 'password' => bcrypt('secret')
-        // ]);
-        DB::table('categories')->insert([
-            [
-                // 'id' => '1',
-                'category' => 'Sains',
-                'created_at' => '2015-06-09 00:17:51',
-                'updated_at' => '2015-06-09 01:01:36',
-            ],
-            [
-                // 'id' => '2',
-                'category' => 'Computer',
-                'created_at' => '2015-06-09 01:07:41',
-                'updated_at' => '2015-06-09 01:07:41',
-            ],
-            [
-                // 'id' => '3',
-                'category' => 'Life Lesson',
-                'created_at' => '2015-06-09 01:07:50',
-                'updated_at' => '2015-06-09 01:07:50',
-            ],
-            [
-                // 'id' => '4',
-                'category' => 'Fairy Tail',
-                'created_at' => '2015-06-09 01:07:50',
-                'updated_at' => '2015-06-09 01:07:50',
-            ],
-        ]);
-    }
-}
-
 class CollectionTableSeeder extends Seeder
 {
     public function run()
@@ -148,30 +87,4 @@ class CollectionTableSeeder extends Seeder
             ],
         ]);
     }
-}
-
-class DocumentTableSeeder extends Seeder
-{
-    public function run()
-    {
-        DB::table('documents')->insert([
-            [
-                'id' => '0',
-            ],
-            [
-                'id' => '1',
-            ],
-        ]);
-
-        DB::table('link_documents_collections')->insert([
-            [
-                'document_id' => '0',
-                'collection_id' => '1',
-            ],
-            [
-                'document_id' => '1',
-                'collection_id' => '1',
-            ],
-        ]);
-    }
-}
+}
\ No newline at end of file
diff --git a/database/seeds/MimetypeTableSeeder.php b/database/seeds/MimetypeTableSeeder.php
new file mode 100644
index 0000000..0eefec7
--- /dev/null
+++ b/database/seeds/MimetypeTableSeeder.php
@@ -0,0 +1,65 @@
+<?php
+
+use Carbon\Carbon;
+use Illuminate\Database\Seeder;
+use Illuminate\Support\Facades\DB;
+
+
+class MimetypeTableSeeder extends Seeder
+{
+    public function run()
+    {
+       
+        DB::table('mime_types')->insert([
+            [
+                'name' => 'image/jpeg',
+                'file_extension' => 'jpg|jpeg|jpe',
+                'enabled' =>true,
+                'created_at' => Carbon::now(),
+                'updated_at' => Carbon::now(),
+            ],
+            [
+                'name' => 'image/png',
+                'file_extension' => 'png',
+                'enabled' =>true,
+                'created_at' => Carbon::now(),
+                'updated_at' => Carbon::now(),
+            ],
+            [
+                'name' => 'application/pdf',
+                'file_extension' => 'pdf',
+                'enabled' =>true,
+                'created_at' => Carbon::now(),
+                'updated_at' => Carbon::now(),
+            ],
+            [
+                'name' => 'text/html',
+                'file_extension' => 'htm|html',
+                'enabled' =>true,
+                'created_at' => Carbon::now(),
+                'updated_at' => Carbon::now(),
+            ],
+            [
+                'name' => 'text/csv',
+                'file_extension' => 'csv',
+                'enabled' =>true,
+                'created_at' => Carbon::now(),
+                'updated_at' => Carbon::now(),
+            ],
+            [
+                'name' => 'text/plain',
+                'file_extension' => 'txt|asc|c|cc|h|srt',
+                'enabled' =>true,
+                'created_at' => Carbon::now(),
+                'updated_at' => Carbon::now(),
+            ],
+            [
+                'name' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+                'file_extension' => 'xlsx',
+                'enabled' =>true,
+                'created_at' => Carbon::now(),
+                'updated_at' => Carbon::now(),
+            ],
+        ]);
+    }
+}