Comments = new Mongo.Collection('comments');

Meteor.methods({
  commentInsert: function (commentAttributes) {
    check(this.userId, String);
    check(commentAttributes, {
      postId: String,
      body: String
    });

    var user = Meteor.user();
    var post = Posts.findOne(commentAttributes.postId);

    if (!post) {
      throw new Meteor.Error('invalid-comment', 'You must comment on a post');
    }
    var comment = _.extend(commentAttributes, {
      userId: user._id,
      author: user.username,
      submitted: new Date()
    });

    // Update the post with the number of comments.
    Posts.update(comment.postId, {
      $inc: { commentsCount: 1 }
    });

    // Create the comment, save its id.
    comment._id = Comments.insert(comment);

    // Now create a notification, informing the post author that there's been a
    // comment created on their post.
    createCommentNotification(comment);

    return comment._id;
  }
});