text: var mongoose = require('mongoose')
  var Schema = mongoose.Schema
  
  module.exports = mongoose.model('Article', {
    title: { type: String, default: '' },
    detail: { type: String, default: '' },
    by: { type: String, default: '' },
    tags: { type: String, default: '' },
    comments: [ { type: Schema.Types.ObjectId, ref: 'Comment' } ]
  })
  