Filter refactoring

app/Filter/ProjectGroupRoleUsernameFilter.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Kanboard\Filter;
+
+use Kanboard\Core\Filter\FilterInterface;
+use Kanboard\Model\GroupMember;
+use Kanboard\Model\ProjectGroupRole;
+use Kanboard\Model\User;
+
+/**
+ * Filter ProjectGroupRole users by username
+ *
+ * @package filter
+ * @author  Frederic Guillot
+ */
+class ProjectGroupRoleUsernameFilter extends BaseFilter implements FilterInterface
+{
+    /**
+     * Get search attribute
+     *
+     * @access public
+     * @return string[]
+     */
+    public function getAttributes()
+    {
+        return array();
+    }
+
+    /**
+     * Apply filter
+     *
+     * @access public
+     * @return FilterInterface
+     */
+    public function apply()
+    {
+        $this->query
+            ->join(GroupMember::TABLE, 'group_id', 'group_id', ProjectGroupRole::TABLE)
+            ->join(User::TABLE, 'id', 'user_id', GroupMember::TABLE)
+            ->ilike(User::TABLE.'.username', $this->value.'%');
+
+        return $this;
+    }
+}