activity_enrich

activity_enrich.php

<?php


function get_users($ids){
    // queries the db and returns an assoc array eg. array(1=>user1,...)
    return array(
        '1'=> 'tommaso',
        '2'=> 'mike',
        '3'=> 'thierry',
    );
}

// same as get_users but on different tables
function get_posts($ids){
    return array(
        '23'=> 'building a newsfeed with stream',
    );
}

function get_follows($ids){
    return array(
        '24'=> 'mike followed tommaso',
    );
}

function get_images($ids){
    return array(
        '24'=> 'http://33.media.tumblr.com/avatar_be8b5eef9ae6_128.png',
    );
}

function enrich_activities($activities){
    $ids = array();
    $objects = array();

    // collect object ids to retrieve from database
    foreach ($activities as $activity) {
        $ids['user'][$activity['actor']] = 1;
        $content_data = explode(":", $activity['object']);
        $content_type = $content_data[0];
        $content_id = $content_data[1];
        $ids[$content_type][$content_id] = 1;
    }

    // gets data from db
    $objects['user'] = get_users(array_keys($ids['user']));
    $objects['post'] = get_posts(array_keys($ids['post']));
    $objects['image'] = get_follows(array_keys($ids['image']));
    $objects['follow'] = get_images(array_keys($ids['follow']));

    // at this point $objects looks like this
    // array(
    //     'user'=>array(1=>user1, 2=>user2),
    //     'post'=>array(23=>post23),
    // )

    foreach ($activities as $key => $activity) {
        $activities[$key]['actor'] = $objects['user'][$activity['actor']];
        $content_data = explode(":", $activity['object']);
        $content_type = $content_data[0];
        $content_id = $content_data[1];
        $activities[$key]['object'] = $objects[$content_type][$content_id];
    }
    return $activities;
}


$activities = array(
    array('actor'=> '1', 'verb'=> 'tweet', 'object'=> 'post:23'),
    array('actor'=> '2', 'verb'=> 'tweet', 'object'=> 'image:24'),
    array('actor'=> '3', 'verb'=> 'tweet', 'object'=> 'follow:24')
);

print_r(enrich_activities($activities));

?>