text: // Creates a "Chat" model that matches up with DB
  module.exports = function(sequelize, DataTypes) {
    let Username = sequelize.define('Username', {
      username: {
        type: DataTypes.STRING,
        allowNull: false,
        unique: true,
        validate: {
          len: [1,15]
        }
      },
    });
    Username.associate = function(models) {
      Username.belongsTo(models.Chat, {
        foreignKey: {
          allowNull: false
        }
      });
    };
    return Username;
  };