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faster getTeasers

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This commit is contained in:
barisusakli
2014-12-19 23:56:51 -05:00
parent 14e46a87a6
commit 83312ad53a
2 changed files with 49 additions and 41 deletions
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88
src/topics/teaser.js
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@@ -12,68 +12,76 @@ var async = require('async'),
module.exports = function(Topics) {
Topics.getTeasers = function(tids, callback) {
if (!Array.isArray(tids) || !tids.length) {
Topics.getTeasers = function(topics, callback) {
if (!Array.isArray(topics) || !topics.length) {
return callback(null, []);
}
Topics.getTopicsFields(tids, ['postcount', 'teaserPid'], function(err, topics) {
var counts = [];
var teaserPids = [];
topics.forEach(function(topic) {
counts.push(topic && (parseInt(topic.postcount, 10) || 0));
if (topic && topic.teaserPid) {
teaserPids.push(topic.teaserPid);
}
});
posts.getPostsFields(teaserPids, ['pid', 'uid', 'timestamp', 'tid'], function(err, postData) {
if (err) {
return callback(err);
}
var counts = [];
var teaserPids = [];
topics.forEach(function(topic) {
counts.push(topic && (parseInt(topic.postcount, 10) || 0));
if (topic && topic.teaserPid) {
teaserPids.push(topic.teaserPid);
}
var uids = postData.map(function(post) {
return post.uid;
}).filter(function(uid, index, array) {
return array.indexOf(uid) === index;
});
posts.getPostsFields(teaserPids, ['pid', 'uid', 'timestamp', 'tid'], function(err, postData) {
user.getMultipleUserFields(uids, ['uid', 'username', 'userslug', 'picture'], function(err, usersData) {
if (err) {
return callback(err);
}
var uids = postData.map(function(post) {
return post.uid;
}).filter(function(uid, index, array) {
return array.indexOf(uid) === index;
var users = {};
usersData.forEach(function(user) {
users[user.uid] = user;
});
var tidToPost = {};
postData.forEach(function(post) {
post.user = users[post.uid];
post.timestamp = utils.toISOString(post.timestamp);
tidToPost[post.tid] = post;
});
user.getMultipleUserFields(uids, ['uid', 'username', 'userslug', 'picture'], function(err, usersData) {
if (err) {
return callback(err);
var teasers = topics.map(function(topic, index) {
if (tidToPost[topic.tid]) {
tidToPost[topic.tid].index = counts[index];
}
var users = {};
usersData.forEach(function(user) {
users[user.uid] = user;
});
var tidToPost = {};
postData.forEach(function(post) {
post.user = users[post.uid];
post.timestamp = utils.toISOString(post.timestamp);
tidToPost[post.tid] = post;
});
var teasers = tids.map(function(tid, index) {
if (tidToPost[tid]) {
tidToPost[tid].index = counts[index];
}
return tidToPost[tid];
});
callback(null, teasers);
return tidToPost[topic.tid];
});
callback(null, teasers);
});
});
};
Topics.getTeasersByTids = function(tids, callback) {
if (!Array.isArray(tids) || !tids.length) {
return callback(null, []);
}
async.waterfall([
function(next) {
Topics.getTopicsFields(tids, ['tid', 'postcount', 'teaserPid'], next);
},
function(topics, next) {
Topics.getTeasers(topics, next);
}
], callback);
};
Topics.getTeaser = function(tid, callback) {
Topics.getTeasers([tid], function(err, teasers) {
Topics.getTeasersByTids([tid], function(err, teasers) {
callback(err, Array.isArray(teasers) && teasers.length ? teasers[0] : null);
});
};