samples/blog/Post.php

   1 <?php
   2
   3 class PostModel extends ActiveMongo
   4 {
   5     public $title;
   6     public $uri;
   7     public $author;
   8     public $comment;
   9     public $ts;
  10
  11     const LIMIT_PER_PAGE=20;
  12
  13     /**
  14      *  Return this collection name.
  15      *
  16      *  @return string
  17      */
  18     function getCollectionName()
  19     {
  20         return 'post';
  21     }
  22
  23     /**
  24      *  Display the blog posts entries in the correct
  25      *  order, getting only the needed columns, and
  26      *  adding pagination.
  27      *
  28      *  @return PostModel This document
  29      */
  30     function listing_page()
  31     {
  32         /* Get collection */
  33         $collection = $this->_getCollection();
  34
  35         /* Deal with MongoDB directly  */
  36         $columns = array(
  37             'title' => 1,
  38             'uri' => 1,
  39             'author_name' => 1,
  40             'author_username' => 1,
  41             'ts' => 1,
  42         );
  43         $cursor  = $collection->find(array(), $columns);
  44         $cursor->sort(array("ts" => -1))->limit(self::LIMIT_PER_PAGE);
  45
  46         /* Pagination */
  47         if (isset($_GET['page']) && is_numeric($_GET['page']) && $_GET['page'] > 0) {
  48             $skip = (int)$_GET['page'] * self::LIMIT_PER_PAGE;
  49             $cursor->skip($skip);
  50         }
  51
  52         /* Pass our results to ActiveMongo */
  53         $this->setCursor($cursor);
  54
  55         return $this;
  56     }
  57
  58     function pre_save($op, &$obj)
  59     {
  60         if ($op == "create") {
  61             $obj['ts'] = new MongoTimestamp();
  62         }
  63     }
  64
  65
  66     /**
  67      *  Author Filter.
  68      *
  69      *  Check if we save the Author _id,
  70      *  or it throws an exception.
  71      *
  72      *  @param mixed &$value    Current value
  73      *  @param mixed $old_value Past value, used on Update
  74      *
  75      *  @return bool
  76      */
  77     function author_filter(&$value, $old_value)
  78     {
  79         if (!$value instanceof MongoID) {
  80             if (!$value InstanceOf AuthorModel) {
  81                 throw new Exception("The author property must be an AuthorModel object");
  82             }
  83             $value = $value->getID();
  84             if ($value === false) {
  85                 throw new Exception("The AuthorModel doesn't have any record");
  86             }
  87         }
  88         return true;
  89     }
  90
  91     /**
  92      *  Update Author information in the Posts. This function
  93      *  is trigger when a new Post is created or the Author
  94      *  has updated his/her profile.
  95      *
  96      *  @param MongoID $id  Author ID
  97      *
  98      *  @return void
  99      */
 100     function updateAuthorInfo(MongoID $id)
 101     {
 102         $author = new AuthorModel;
 103         $author->find($id);
 104
 105         $document = array(
 106             '$set' => array(
 107                 'author_name' => $author->name,
 108                 'author_username' => $author->username,
 109             ),
 110         );
 111
 112         $filter = array(
 113             'author' => $id,
 114         );
 115
 116         $this->_getCollection()->update($filter, $document, array('multiple' => true));
 117
 118         return true;
 119     }
 120
 121     /**
 122      *  A new post must have its author information
 123      *  on it. (to avoid multiple requests at render time).
 124      *
 125      *  @return void
 126      */
 127     function on_save()
 128     {
 129         $this->updateAuthorInfo($this->author);
 130     }
 131
 132     /**
 133      *  Simple abstraction to add a new comment,
 134      *  to avoid typo errors at coding time.
 135      */
 136     function add_comment($user, $email, $comment)
 137     {
 138         $this->comment[] = array(
 139             "user" => $user,
 140             "email" => $email,
 141             "comment" => $comment,
 142         );
 143         return true;
 144     }
 145
 146     function setup()
 147     {
 148         $collection = & $this->_getCollection();
 149         $collection->ensureIndex(array('uri' => 1), array('unique'=> 1, 'background' => 1));
 150         $collection->ensureIndex(array('author' => 1), array('background' => 1));
 151         $collection->ensureIndex(array('ts' => -1), array('background' => 1));
 152     }
 153 }
 154
 155