text: var mongoose = require("mongoose");
   
  var commentSchema = new mongoose.Schema({
      text: String,
      createdAt: { type: Date, default: Date.now },
      author: {
          id: {
              type: mongoose.Schema.Types.ObjectId,
              ref: "User"
          },
          username: String
      }
  });
   
  module.exports = mongoose.model("Comment", commentSchema);
  