Add autocompletion in textarea for user mentions

app/Model/ProjectUserRoleFilter.php

@@ -0,0 +1,88 @@
+<?php
+
+namespace Kanboard\Model;
+
+/**
+ * Project User Role Filter
+ *
+ * @package  model
+ * @author   Frederic Guillot
+ */
+class ProjectUserRoleFilter extends Base
+{
+    /**
+     * Query
+     *
+     * @access protected
+     * @var \PicoDb\Table
+     */
+    protected $query;
+
+    /**
+     * Initialize filter
+     *
+     * @access  public
+     * @return  UserFilter
+     */
+    public function create()
+    {
+        $this->query = $this->db->table(ProjectUserRole::TABLE);
+        return $this;
+    }
+
+    /**
+     * Get all results of the filter
+     *
+     * @access public
+     * @param  string $column
+     * @return array
+     */
+    public function findAll($column = '')
+    {
+        if ($column !== '') {
+            return $this->query->asc($column)->findAllByColumn($column);
+        }
+
+        return $this->query->findAll();
+    }
+
+    /**
+     * Get the PicoDb query
+     *
+     * @access public
+     * @return \PicoDb\Table
+     */
+    public function getQuery()
+    {
+        return $this->query;
+    }
+
+    /**
+     * Filter by project id
+     *
+     * @access public
+     * @param  integer $project_id
+     * @return ProjectUserRoleFilter
+     */
+    public function filterByProjectId($project_id)
+    {
+        $this->query->eq(ProjectUserRole::TABLE.'.project_id', $project_id);
+        return $this;
+    }
+
+    /**
+     * Filter by username
+     *
+     * @access public
+     * @param  string $input
+     * @return ProjectUserRoleFilter
+     */
+    public function startWithUsername($input)
+    {
+        $this->query
+            ->join(User::TABLE, 'id', 'user_id')
+            ->ilike(User::TABLE.'.username', $input.'%');
+
+        return $this;
+    }
+}