text: const { Schema, model} = require("mongoose");
  
  const topicSchema = new Schema({
      __v: {type: Number, select: false},
      name: {type: String, required: true},
      avatar_url: {type: String},
      introduction: {type: String, select: false}
  }, {timestamps: true})
  
  module.exports = model("Topic", topicSchema)