Connect CalDAV todos to DB-Items, finish todo component and add it to pipeline items

app/Models/PipelineItem.php

@@ -39,4 +39,12 @@ public function notes()
     {
         return $this->morphMany(Note::class, 'notable');
     }
+
+    /**
+     * Get the todos
+     */
+    public function todos()
+    {
+        return $this->morphMany(Todo::class, 'todoable');
+    }
 }

app/Models/Todo.php

@@ -31,6 +31,8 @@ class Todo extends Model
         'last_modified',
         'parent',
         'object',
+        'todoable_id',
+        'todoable_type'
     ];
 
     protected $casts = [
@@ -53,4 +55,4 @@ public function children()
     {
         return $this->hasMany(self::class, 'parent');
     }
-}
+}