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copied!<p>You don't need to join the fields manually because it's done automatically. Check the outputs in the code bellow based on your question:</p> <pre><code>Ext.define('User', { extend: 'Ext.data.Model', fields: [ {name: 'name', type: 'string'}, {name: 'age', type: 'int'}, {name: 'phone', type: 'string'}, {name: 'alive', type: 'boolean', defaultValue: true} ], }); Ext.define('BusinessUser', { extend: 'User', fields: [ {name: 'businessType', type: 'string'}, {name: 'company', type: 'string'} ], }); // instantiating a User object var u = Ext.create('BusinessUser', { name: 'John Doe', age: 30, phone: '555-5555' }); // instantiating a BusinessUser object var bu = Ext.create('BusinessUser', { name: 'Jane Doe', age: 40, phone: '555-5556', businessType: 'analyst', company: 'ACME' }); console.log(Ext.getClassName(bu)); // "BusinessUser" console.log(Ext.getClassName(u)); // "User" console.log(u instanceof User); // true console.log(bu instanceof User); // true console.log(u instanceof BusinessUser); // false console.log(bu instanceof BusinessUser); // true console.log(u instanceof Ext.data.Model); // true console.log(bu instanceof Ext.data.Model); // true console.log(u instanceof Ext.data.Store); // false, just to check if it's not returning true for anything console.log(bu instanceof Ext.data.Store); // false console.log("name" in u.data); // true console.log("name" in bu.data); // true console.log("company" in u.data); // false console.log("company" in bu.data); // true </code></pre>

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