Re-use a smart field logic

This example shows you how to re-use the logic of your smart field.
Here, we created a fullname field that concatenates first and last name. We'll create our own function and export it for use elsewhere in our admin backend.
Requirements
An admin backend running on forest-express-sequelize
How it works
Directory: /models
This directory contains the users.js where the model is defined. 
/models/users.js
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module.exports = (sequelize, DataTypes) => {
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  const { Sequelize } = sequelize;
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​
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  const Users = sequelize.define('users', {
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    firstName: {
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      type: DataTypes.STRING,
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    },
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    lastName: {
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      type: DataTypes.STRING,
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    },
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  }, {
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    tableName: 'users',
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    timestamps: false,
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    schema: process.env.DATABASE_SCHEMA,
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  });
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​
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  return  Users;
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};
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Directory: /forest
This directory contains the users.js file where the Smart Field fullnameis declared.
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const { collection } = require('forest-express-sequelize');
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​
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// create our own module
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const getFullname = (user) => {
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  return `${user.firstName} ${user.lastName}`;
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};
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​
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​
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collection('users', {
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  fields: [{
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    field: 'fullname',
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    type: 'String',
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    get: getFullname,
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  }],
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});
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​
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// export it to use it somewhere else in our admin backend
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module.exports = {
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  getFullname,
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};
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You can now require this module everywhere in your admin backend:
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const { getFullname } = require('../forest/user');
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