code snippets for "Using Mongoose’s Setters To Get Calculated Properties" post

s1.js

var invoiceSchema = new Schema({
    companyId: { type: ObjectId, required: true },
    customerId: { type: ObjectId, required: true },
    invoiceNumber: { type: String, required: true, unique: true },
    date: { type: Date, required: true },
    dueDate: { type: Date, required: true },
    paid: { type: Boolean, required: true, default: false },
    activityId: { type: ObjectId, required: true },
    totalHours: { type: Number, required: true },
    hourlyRate: { type: Number, required: true },
    totalExcludingVat: { type: Number, required: true },
    vat: { type: Number, required: true },
    totalIncludingVat: { type: Number, required: true }
});

s2.js

invoiceSchema.path('totalExcludingVat').set(function(value) {
    this.vat = value * 0.21;
    this.totalIncludingVat = value * 1.21;
    return value;
});

s3.js

describe('given an invoice', function() {
 
    var invoice = new Invoice();
 
    describe('when you set its totalExcludingVat property', function() {
         
        invoice.totalExcludingVat = 1000;
 
        it('should automatically set the vat property', function() {
            expect(invoice.vat).toEqual(210);
        });
 
        it('should automatically set the totalIncludingVat property', function() {
            expect(invoice.totalIncludingVat).toEqual(1210);
        });
 
    });
});
 
describe('given an invoice created with a totalExcludingVat value', function() {
 
    var invoice = new Invoice({ totalExcludingVat: 1000 });
 
    it('should contain the correct vat value', function() {
        expect(invoice.vat).toEqual(210);
    });
 
    it('should contain the correct totalIncludingVat property', function() {
        expect(invoice.totalIncludingVat).toEqual(1210);
    });
});

s4.js

invoice.totalExcludingVat = 1000;

s5.js

invoice['totalExcludingVat'] = 1000;