const mongoose = require('mongoose');

const userSchema = new mongoose.Schema({
  username: String,
  emoticons: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'Emoticon'
  }
});

const User = mongoose.model('User', userSchema);

module.exports = User;

@@ -106,16 +106,17 @@
 ticons: 
+%5B
 %7B%0A    ty
@@ -174,16 +174,17 @@
 con'%0A  %7D
+%5D
 %0A%7D);%0A%0Aco

Make emoticons an array of objects in user schema