Google/Facebook like comments recursion with node.js jade template enging using mixin

jade-blog-post-comment-recursion.jade

if post.comments != undefined && post.comments.length
    .container
        .row
            .comments-container
                h2="Comments"
                ul#comments-list.comments-list

                    mixin commentView(comment)
                        - var children = post.comments.filter(function(child) { return comment.id === parseInt(child.parent); })
                        - console.log(children)
                        if comment.parent != ""

                            li
                                .comment-avatar
                                    if comment.user.avatar == ""
                                        img(src='https://ssl.gstatic.com/accounts/ui/avatar_2x.png', alt='')
                                    else
                                        img(src='accounts/' + comment.user.id + "/" + comment.user.avatar, alt='')
                                .comment-box
                                    .comment-head
                                        h6.comment-name(class=(comment.user.id == post.idOwner ? 'by-author' : ''))
                                            a()=comment.user.first_name + " " + comment.user.last_name
                                        span hace 10 minutos
                                        i.fa.fa-reply(data-ng-click="addComment('" + post.slug + "', '" + comment.id + "')")
                                    .comment-content=comment.comment

                        each comment in children
                            ul.comments-list.reply-list
                                +commentView(comment)

                    li
                        each comment in post.comments
                            if comment.parent == ""
                                .comment-main-level
                                    .comment-avatar
                                        if comment.user.avatar == ""
                                            img(src='https://ssl.gstatic.com/accounts/ui/avatar_2x.png', alt='')
                                        else
                                            img(src='accounts/' + comment.user.id + "/" + comment.user.avatar, alt='')
                                    .comment-box
                                        .comment-head
                                            h6.comment-name(class=(comment.user.id == post.idOwner ? 'by-author' : ''))
                                                a()=comment.user.first_name + " " + comment.user.last_name
                                            span=moment.unix(comment.createdAt).format("DD-MMM-YYYY, h:mm:ss a")
                                            i.fa.fa-reply(data-ng-click="addComment('" + post.slug + "', '" + comment.id + "')")
                                        .comment-content=comment.comment
                                +commentView(comment)
                .clear
            .clear
        .clear
    .clear
.clear

Html and css at: http://bootsnipp.com/snippets/459K9