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/** * Module dependencies. */
'use strict';
const mongoose = require('../../lib');const Schema = mongoose.Schema;
/** * Schema definition */
// recursive embedded-document schema
const Comment = new Schema();
Comment.add({  title: {    type: String,    index: true  },  date: Date,  body: String,  comments: [Comment]});
const BlogPost = new Schema({  title: {    type: String,    index: true  },  slug: {    type: String,    lowercase: true,    trim: true  },  date: Date,  buf: Buffer,  comments: [Comment],  creator: Schema.ObjectId});
const Person = new Schema({  name: {    first: String,    last: String  },  email: {    type: String,    required: true,    index: {      unique: true,      sparse: true    }  },  alive: Boolean});
/** * Accessing a specific schema type by key */
BlogPost.path('date')  .default(function() {    return new Date();  })  .set(function(v) {    return v === 'now' ? new Date() : v;  });
/** * Pre hook. */
BlogPost.pre('save', function(next, done) {  /* global emailAuthor */  emailAuthor(done); // some async function  next();});
/** * Methods */
BlogPost.methods.findCreator = function(callback) {  return this.db.model('Person').findById(this.creator, callback);};
BlogPost.statics.findByTitle = function(title, callback) {  return this.find({ title: title }, callback);};
BlogPost.methods.expressiveQuery = function(creator, date, callback) {  return this.find('creator', creator).where('date').gte(date).run(callback);};
/** * Plugins */
function slugGenerator(options) {  options = options || {};  const key = options.key || 'title';
  return function slugGenerator(schema) {    schema.path(key).set(function(v) {      this.slug = v.toLowerCase().replace(/[^a-z0-9]/g, '').replace(/-+/g, '');      return v;    });  };}
BlogPost.plugin(slugGenerator());
/** * Define model. */
mongoose.model('BlogPost', BlogPost);mongoose.model('Person', Person);