post.js

gistfile1.txt

function PostsDAO(db) {
    "use strict";

    if (false === (this instanceof PostsDAO)) {
        console.log('Warning: PostsDAO constructor called without "new" operator');
        return new PostsDAO(db);
    }

    var posts = db.collection("posts");

    this.insertEntry = function (title, body, tags, author, callback) {
        "use strict";
        console.log("inserting blog entry" + title + body);

        var permalink = title.replace( /\s/g, '_' );
        permalink = permalink.replace( /\W/g, '' );

        var post = {"title": title,
            "author": author,
            "body": body,
            "permalink":permalink,
            "tags": tags,
            "comments": [],
            "date": new Date()}

        posts.insert(post, function (err, result) {
            "use strict";

            if (err) return callback(err, null);

            console.log("Inserted new post");
            callback(err, permalink);
        });
    }

    this.getPosts = function(num, callback) {
        "use strict";

        posts.find().sort('date', -1).limit(num).toArray(function(err, items) {
            "use strict";

            if (err) return callback(err, null);

            console.log("Found " + items.length + " posts");

            callback(err, items);
        });
    }

    this.getPostsByTag = function(tag, num, callback) {
        "use strict";

        posts.find({ tags : tag }).sort('date', -1).limit(num).toArray(function(err, items) {
            "use strict";

            if (err) return callback(err, null);

            console.log("Found " + items.length + " posts");

            callback(err, items);
        });
    }

    this.getPostByPermalink = function(permalink, callback) {
        "use strict";
        posts.findOne({'permalink': permalink}, function(err, post) {
            "use strict";

            if (err) return callback(err, null);

            if (typeof post.comments === 'undefined') {
                post.comments = [];
            }

            for (var i = 0; i < post.comments.length; i++) {
                console.log(post.comments[i].num_likes);
                if (typeof post.comments[i].num_likes === 'undefined') {
                    post.comments[i].num_likes = 0;
                }
                post.comments[i].comment_ordinal = i;
            }
            callback(err, post);
        });
    }

    this.addComment = function(permalink, name, email, body, callback) {
        "use strict";

        var comment = {'author': name, 'body': body}

        if (email != "") {
            comment['email'] = email
        }

        posts.update({'permalink': permalink}, {'$push': {'comments': comment}}, function(err, numModified) {
            "use strict";

            if (err) return callback(err, null);

            callback(err, numModified);
        });
    }

    this.incrementLikes = function(permalink, comment_ordinal, callback) {
        "use strict";

        var comments = {};
        posts.update({'permalink':permalink}, {'$inc': comments[comment_ordinal].num_likes = 1}, function(err, post){
            callback(err, post);
        });
        posts.findOne({'permalink':permalink},  function(err, post) {
            console.log(post);
        });
    }
}

module.exports.PostsDAO = PostsDAO;