meta_model.js

  platform: {type: String, required: true},
  platformid: {type: String, required: true},
  posttime: {type: Date, required: true},
  feedid: {type: String, required: true},
  clientid: {type: String, required: true},
  meta: {
    tags: [{type: String}],
    rating: {type: Number, min: 1, max: 10, default: 0, required: true},
    approval: {
      isapproved: {type: Boolean, required: true, default: false},
      approvedby: [{type: Schema.Types.ObjectId, ref: 'User'}],
      approveddate: {type: Date}
    },
    custom: [{type: Schema.Types.Mixed}]
  }