Made it possible to sign up for events.

Added fail and success messages when signing up.
Fixed unique keys in migrate

skolehjem/app/UserEvent.php

@@ -6,5 +6,13 @@ use Illuminate\Database\Eloquent\Model;
 
 class UserEvent extends Model
 {
-    //
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    //protected variable which contains name of database field(s) to be filled.
+    protected $fillable = [
+        'user_id', 'event_id'
+    ];
 }