Added model and validator for product's benefit item

refs https://github.com/TryGhost/Team/issues/792

- updates product model to read product's list of benefits
- adds transformer to return emberArray with list of product benefits
- adds new model for each product benefit
- adds validator for new product benefit

ghost/admin/app/mixins/validation-engine.js

@@ -10,6 +10,7 @@ import Mixin from '@ember/object/mixin';
 import Model from '@ember-data/model';
 import NavItemValidator from 'ghost-admin/validators/nav-item';
 import PostValidator from 'ghost-admin/validators/post';
+import ProductBenefitItemValidator from 'ghost-admin/validators/product-benefit-item';
 import ProductValidator from 'ghost-admin/validators/product';
 import RSVP from 'rsvp';
 import ResetValidator from 'ghost-admin/validators/reset';
@@ -42,6 +43,7 @@ export default Mixin.create({
         customView: CustomViewValidator,
         inviteUser: InviteUserValidator,
         navItem: NavItemValidator,
+        productBenefitItem: ProductBenefitItemValidator,
         post: PostValidator,
         reset: ResetValidator,
         setting: SettingValidator,

ghost/admin/app/models/product-benefit-item.js

@@ -0,0 +1,23 @@
+import EmberObject from '@ember/object';
+import ValidationEngine from 'ghost-admin/mixins/validation-engine';
+import {computed} from '@ember/object';
+import {isBlank} from '@ember/utils';
+
+export default EmberObject.extend(ValidationEngine, {
+    label: '',
+    isNew: false,
+
+    validationType: 'productBenefitItem',
+
+    isComplete: computed('label', function () {
+        let {label} = this;
+
+        return !isBlank(label);
+    }),
+
+    isBlank: computed('label', function () {
+        let {label} = this;
+
+        return isBlank(label);
+    })
+});

ghost/admin/app/models/product.js

@@ -8,5 +8,6 @@ export default Model.extend(ValidationEngine, {
     description: attr('string'),
     slug: attr('string'),
     monthlyPrice: attr('stripe-price'),
-    yearlyPrice: attr('stripe-price')
+    yearlyPrice: attr('stripe-price'),
+    benefits: attr('product-benefits')
 });

ghost/admin/app/transforms/product-benefits.js

@@ -0,0 +1,37 @@
+import ProductBenefitItem from '../models/product-benefit-item';
+import Transform from '@ember-data/serializer/transform';
+import {A as emberA, isArray as isEmberArray} from '@ember/array';
+
+export default Transform.extend({
+    deserialize(serialized, options) {
+        let benefitsItems, benefitsArray;
+
+        try {
+            benefitsArray = JSON.parse(serialized) || [];
+        } catch (e) {
+            benefitsArray = [];
+        }
+
+        benefitsItems = benefitsArray.map((itemDetails) => {
+            itemDetails.isSecondary = options && options.isSecondary || false;
+            return ProductBenefitItem.create(itemDetails);
+        });
+
+        return emberA(benefitsItems);
+    },
+
+    serialize(deserialized) {
+        let benefitsArray;
+
+        if (isEmberArray(deserialized)) {
+            benefitsArray = deserialized.map((item) => {
+                let label = item.get('label').trim();
+                return {label};
+            }).compact();
+        } else {
+            benefitsArray = [];
+        }
+
+        return JSON.stringify(benefitsArray);
+    }
+});

ghost/admin/app/validators/product-benefit-item.js

@@ -0,0 +1,18 @@
+import BaseValidator from './base';
+import {isBlank} from '@ember/utils';
+
+export default BaseValidator.create({
+    properties: ['label'],
+
+    label(model) {
+        let label = model.get('label');
+        let hasValidated = model.get('hasValidated');
+
+        if (isBlank(label)) {
+            model.get('errors').add('label', 'You must specify a label');
+            this.invalidate();
+        }
+
+        hasValidated.addObject('label');
+    }
+});