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