Added newsletter in get helper

refs https://github.com/TryGhost/Product/issues/3859

---------

Co-authored-by: Michael Barrett <mike182uk@gmail.com>

ghost/core/core/frontend/helpers/foreach.js

@@ -31,6 +31,14 @@ module.exports = function foreach(items, options) {
         if (Object.values(items).length > 0 && checks.isPost(Object.values(items)[0])) {
             visibility = visibility || 'all';
         }
+    } 
+
+    if (_.isArray(items) && items.length > 0 && checks.isNewsletter(items[0])) {
+        visibility = visibility || 'all';
+    } else if (_.isObject(items) && _.isArray(Object.values(items))) {
+        if (Object.values(items).length > 0 && checks.isNewsletter(Object.values(items)[0])) {
+            visibility = visibility || 'all';
+        }
     }
     // Exclude items which should not be visible in the theme
     items = ghostHelperUtils.visibility.filter(items, visibility);

ghost/core/core/frontend/helpers/get.js

@@ -33,6 +33,9 @@ const RESOURCES = {
     },
     tiers: {
         alias: 'tiersPublic'
+    },
+    newsletters: {
+        alias: 'newslettersPublic'
     }
 };
 

ghost/core/core/frontend/services/data/checks.js

@@ -3,6 +3,11 @@ function isPost(jsonData) {
         Object.prototype.hasOwnProperty.call(jsonData, 'title') && Object.prototype.hasOwnProperty.call(jsonData, 'slug');
 }
 
+function isNewsletter(jsonData) {
+    return Object.prototype.hasOwnProperty.call(jsonData, 'name') &&
+        Object.prototype.hasOwnProperty.call(jsonData, 'subscribe_on_signup') && Object.prototype.hasOwnProperty.call(jsonData, 'visibility');
+}
+
 function isPage(jsonData = {}) {
     return Object.prototype.hasOwnProperty.call(jsonData, 'show_title_and_feature_image');
 }
@@ -24,6 +29,7 @@ function isNav(jsonData) {
 
 module.exports = {
     isPost,
+    isNewsletter,
     isPage,
     isTag,
     isUser,

ghost/core/test/unit/frontend/helpers/foreach.test.js

@@ -402,6 +402,27 @@ describe('{{#foreach}} helper', function () {
             shouldCompileToExpected(templateString, objectHashWithVis, expected);
         });
 
+        it('foreach with newsletters with members visibility', function () {
+            const newsletterObjectHashWithVisibility = {
+                newsletters: {
+                    first: {name: 'first', visibility: 'members', subscribe_on_signup: true},
+                    second: {name: 'second', visibility: 'members', subscribe_on_signup: true},
+                    third: {name: 'third', visibility: 'paid', subscribe_on_signup: false}
+                }
+            };
+            const newsletterArrayHashWithVisibility = {
+                newsletters: [
+                    {name: 'first', visibility: 'members', subscribe_on_signup: true},
+                    {name: 'second', visibility: 'members', subscribe_on_signup: true},
+                    {name: 'third', visibility: 'paid', subscribe_on_signup: false}
+                ]
+            };
+            const templateString = '<ul>{{#foreach newsletters}}<li>{{name}}</li>{{else}}not this{{/foreach}}</ul>';
+            const expected = '<ul><li>first</li><li>second</li><li>third</li></ul>';
+            shouldCompileToExpected(templateString, newsletterObjectHashWithVisibility, expected);
+            shouldCompileToExpected(templateString, newsletterArrayHashWithVisibility, expected);
+        });
+
         it('foreach with from 2', function () {
             const templateString = '<ul>{{#foreach posts from="2"}}<li>{{title}}</li>{{else}}not this{{/foreach}}</ul>';
             const expected = '<ul><li>second</li><li>third</li><li>fourth</li><li>fifth</li></ul>';

ghost/core/test/unit/frontend/helpers/get.test.js

@@ -96,6 +96,35 @@ describe('{{#get}} helper', function () {
         });
     });
 
+    describe('newsletters', function () {
+        const meta = {pagination: {}};
+
+        beforeEach(function () {
+            locals = {root: {_locals: {}}};
+
+            sinon.stub(api, 'newslettersPublic').get(() => {
+                return {
+                    browse: sinon.stub().resolves({newsletters: [], meta: meta})
+                };
+            });
+        });
+
+        it('browse newsletters', function (done) {
+            get.call(
+                {},
+                'newsletters',
+                {hash: {}, data: locals, fn: fn, inverse: inverse}
+            ).then(function () {
+                fn.called.should.be.true();
+                fn.firstCall.args[0].should.be.an.Object().with.property('newsletters');
+                fn.firstCall.args[0].newsletters.should.eql([]);
+                inverse.called.should.be.false();
+
+                done();
+            }).catch(done);
+        });
+    });
+
     describe('general error handling', function () {
         it('should return an error for an unknown resource', function (done) {
             get.call(

ghost/core/test/unit/frontend/services/data/checks.test.js

@@ -5,6 +5,7 @@ describe('Checks', function () {
     it('methods', function () {
         Object.keys(checks).should.eql([
             'isPost',
+            'isNewsletter',
             'isPage',
             'isTag',
             'isUser',
@@ -26,6 +27,13 @@ describe('Checks', function () {
         checks.isPage({title: 'Test', show_title_and_feature_image: true}).should.eql(true);
     });
 
+    it('isNewsletter', function () {
+        checks.isNewsletter({}).should.eql(false);
+        checks.isNewsletter({name: 'Test'}).should.eql(false);
+        checks.isNewsletter({name: 'Test', visibility: 'members', subscribe_on_signup: true}).should.eql(true);
+        checks.isNewsletter({name: 'Test', visibility: 'paid', subscribe_on_signup: false}).should.eql(true);
+    });
+
     it('isTag', function () {
         checks.isTag({}).should.eql(false);
         checks.isTag({name: 'Test'}).should.eql(false);