Listing Handler

- added a Listing Handler class to take care of listing params
- added status column to Subscriber
- added specific methods to both Newsletter & Subscriber models for listing

lib/Router/Subscribers.php

@@ -1,6 +1,7 @@
 <?php
 namespace MailPoet\Router;
 use \MailPoet\Models\Subscriber;
+use \MailPoet\Listing;
 
 if(!defined('ABSPATH')) exit;
 
@@ -9,80 +10,8 @@ class Subscribers {
   }
 
   function get($data = array()) {
-    // pagination
-    $offset = (isset($data['offset']) ? (int)$data['offset'] : 0);
-    $limit = (isset($data['limit']) ? (int)$data['limit'] : 50);
-    // searching
-    $search = (isset($data['search']) ? $data['search'] : null);
-    // sorting
-    $sort_by = (isset($data['sort_by']) ? $data['sort_by'] : 'id');
-    $sort_order = (isset($data['sort_order']) ? $data['sort_order'] : 'asc');
-    // grouping
-    $group = (isset($data['group']) ? $data['group'] : null);
-    $groups = array(
-      array(
-        'name' => 'all',
-        'label' => __('All'),
-        'count' => Subscriber::count()
-      ),
-      array(
-        'name' => 'subscribed',
-        'label' => __('Subscribed'),
-        'count' => Subscriber::where('status', Subscriber::STATE_SUBSCRIBED)->count()
-      ),
-      array(
-        'name' => 'unconfirmed',
-        'label' => __('Unconfirmed'),
-        'count' => Subscriber::where('status', Subscriber::STATE_UNCONFIRMED)->count()
-      ),
-      array(
-        'name' => 'unsubscribed',
-        'label' => __('Unsubscribed'),
-        'count' => Subscriber::where('status', Subscriber::STATE_UNSUBSCRIBED)->count()
-      )
-    );
-
-    // instantiate subscriber collection
-    $collection = Subscriber::{'order_by_'.$sort_order}($sort_by);
-
-    // handle group
-    switch($group) {
-      case 'subscribed':
-        $collection = $collection->where('status', Subscriber::STATE_SUBSCRIBED);
-      break;
-
-      case 'unconfirmed':
-        $collection = $collection->where('status', Subscriber::STATE_UNCONFIRMED);
-      break;
-
-      case 'unsubscribed':
-        $collection = $collection->where('status', Subscriber::STATE_UNSUBSCRIBED);
-      break;
-    }
-
-    // handle search
-    if($search !== null) {
-      $collection->where_raw(
-        '(`email` LIKE ? OR `first_name` LIKE ? OR `last_name` LIKE ?)',
-        array('%'.$search.'%', '%'.$search.'%', '%'.$search.'%')
-      );
-    }
-
-    // handle filters
-    $filters = array();
-
-    // return result
-    $collection = array(
-      'count' => $collection->count(),
-      'filters' => $filters,
-      'groups' => $groups,
-      'items' => $collection
-        ->offset($offset)
-        ->limit($limit)
-        ->find_array()
-    );
-
-    wp_send_json($collection);
+    $listing = new Listing\Handler('Subscriber', $data);
+    wp_send_json($listing->get());
   }
 
   function getAll() {