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504fb1bfa1
no-issue This adds the concept of "Value Objects" to an Offers properties, allowing us to move validation out and ensure that an Offer will only ever have valid properties, without having to duplicate checks - or leave them to the persistent layer. This means we can fail early, as well as write unit tests for all of our validation.
25 lines
757 B
JavaScript
25 lines
757 B
JavaScript
const ValueObject = require('../../shared/ValueObject');
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const InvalidOfferCadence = require('../../errors').InvalidOfferCadence;
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/**
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* @extends ValueObject<'month'|'year'>
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*/
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class OfferCadence extends ValueObject {
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/** @param {unknown} cadence */
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static create(cadence) {
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if (!cadence || typeof cadence !== 'string') {
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throw new InvalidOfferCadence({
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message: 'Offer `cadence` must be a string.'
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});
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}
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if (cadence !== 'month' && cadence !== 'year') {
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throw new InvalidOfferCadence({
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message: 'Offer `cadence` must be one of "month" or "year".'
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});
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}
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return new OfferCadence(cadence);
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}
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}
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module.exports = OfferCadence;
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