Improve model functionality (#88)

* Update working with attributes in model

* Extend Model get functionality to work with complex keys

* Make attributes assign more compact

src/Model.js

@@ -2,7 +2,13 @@ import _ from 'lodash';
 
 export default class Model {
   constructor(attributes) {
-    this.attributes = attributes;
+    this.attributes = Object.assign({}, attributes);
+  }
+
+  get(key) {
+    if (typeof key !== 'string') return undefined;
+
+    return _.get(this.attributes, key);
   }
 
   toJS() {

test/Model.spec.js

@@ -6,7 +6,10 @@ import { Model } from '../src';
 describe('Model', () => {
   const myAttributes = {
     attribute1: 'value1',
-    attribute2: 'value2'
+    attribute2: 'value2',
+    attribute3: {
+      attribute31: 'value31'
+    }
   };
 
   const myModelInstance = new Model(myAttributes);
@@ -23,4 +26,19 @@ describe('Model', () => {
     expect('toJS' in myModelInstance).to.be.equal(true);
     expect(myModelInstance.toJS()).to.be.deep.equal(myAttributes);
   });
+
+  it('must have the attributes available with .get() method', () => {
+    expect(myModelInstance.get('attribute1')).to.be.deep.equal('value1');
+    expect(myModelInstance.get('attribute2')).to.be.deep.equal('value2');
+    expect(myModelInstance.get('attribute3')).to.be.deep.equal(myAttributes.attribute3);
+  });
+
+  it('must return nested attribut value for the key by get() method', () => {
+    expect(myModelInstance.get('attribute3.attribute31')).to.be.deep.equal('value31');
+  });
+
+  it('must return an undefined using .get() method if attribute doesn\'t exist', () => {
+    expect(myModelInstance.get()).to.be.deep.equal(undefined);
+    expect(myModelInstance.get('attributeNotExist')).to.be.deep.equal(undefined);
+  });
 });