🐛Fixed {{get}} helper's date comparison (#9454)

no issue

- Date comparisons are possible via API, but there's no way to inject a valid date into the get helper
- JavaScript's Date.toString() function outputs dates in a useless format
- Swap to using Date.toISOString() and now the format can be understood anywhere!
- {{#get "posts" filter="published_at:<='{{published_at}}'"}}{{/get}} works now as expected

core/server/helpers/get.js

@@ -61,10 +61,17 @@ function resolvePaths(data, value) {
         // Handle Handlebars .[] style arrays
         path = path.replace(/\.\[/g, '[');
 
-        // Do the query, and convert from array to string
-        result = jsonpath.query(data, path).join(',');
+        // Do the query, which always returns an array of matches
+        result = jsonpath.query(data, path);
 
-        return result;
+        // Handle the case where the single data property we return is a Date
+        // Data.toString() is not DB compatible, so use `toISOString()` instead
+        if (_.isDate(result[0])) {
+            result[0] = result[0].toISOString();
+        }
+
+        // Concatenate the results with a comma, handles common case of multiple tag slugs
+        return result.join(',');
     });
 
     return value;

core/test/unit/helpers/get_spec.js

@@ -300,8 +300,10 @@ describe('{{#get}} helper', function () {
     });
 
     describe('path resolution', function () {
-        var browseStub, readStub, data = {
-            post: {id: 3, title: 'Test 3', author: {slug: 'cameron'}, tags: [{slug: 'test'}, {slug: 'magic'}]}
+        var browseStub, readStub,
+            pubDate = new Date(),
+            data = {
+                post: {id: 3, title: 'Test 3', author: {slug: 'cameron'}, tags: [{slug: 'test'}, {slug: 'magic'}], published_at: pubDate}
             };
 
         beforeEach(function () {
@@ -365,6 +367,20 @@ describe('{{#get}} helper', function () {
             }).catch(done);
         });
 
+        it('should handle dates', function (done) {
+            helpers.get.call(
+                data,
+                'posts',
+                {hash: {filter: "published_at:<='{{post.published_at}}'"}, fn: fn, inverse: inverse}
+            ).then(function () {
+                browseStub.firstCall.args.should.be.an.Array().with.lengthOf(1);
+                browseStub.firstCall.args[0].should.be.an.Object().with.property('filter');
+                browseStub.firstCall.args[0].filter.should.eql(`published_at:<='${pubDate.toISOString()}'`);
+
+                done();
+            }).catch(done);
+        });
+
         it('should output nothing if path does not resolve', function (done) {
             helpers.get.call(
                 data,