Mongoose Schema with validation

gistfile1.js

var Schema = mongoose.Schema;

//validation rule
function validator(val){
	if(val != 'red'){
		return true
	}
	return false;
}

//create Schema
var blogSchema = new Schema({
	title: {
		type: String,
		validate: [validator,'Damn, {PATH} cannot be red.'] 
	},
	url: String,
	subreddit: String,
	score: Number,
	thumbnail: String,
	date: {
		type: Date,
		default: Date.now
	},
	comments: [{
		body:String,
		date: Date
	}]
})
blogSchema.statics.random = function(callback){
	this.count(function(err, count) {
	    if (err) {
	      return callback(err);
	    }
	    var rand = Math.floor(Math.random() * count);
	    this.findOne().skip(rand).exec(callback);
  	}.bind(this));
}