Support nested queries for arrays

Enhance the built-in memory connector to correctly support nested
queries for arrays in addition to objects.

E.g. if "friends" is an array of objects containing "name", then
{ where: { "friends.name": "Jane" } } should match records containing
a friend called "Jane".

Author: pponugo

lib/connectors/memory.js

@@ -523,11 +523,15 @@ function applyFilter(filter) {
       // then, we attempt to emulate mongo db matching. Helps for embedded relations
       var dotIndex = key.indexOf('.');
       var subValue = obj[key.substring(0, dotIndex)];
-      if (dotIndex !== -1 && Array.isArray(subValue)) {
+      if (dotIndex !== -1) {
         var subFilter = {where: {}};
         var subKey = key.substring(dotIndex + 1);
         subFilter.where[subKey] = where[key];
-        return subValue.some(applyFilter(subFilter));
+        if (Array.isArray(subValue)) {
+          return subValue.some(applyFilter(subFilter));
+        } else if (typeof subValue === 'object' && subValue !== null) {
+          return applyFilter(subFilter)(subValue);
+        }
       }
 
       return false;

test/memory.test.js

@@ -158,6 +158,11 @@ describe('Memory connector', function() {
         city: String,
         state: String,
         zipCode: String,
+        tags: [
+          {
+            tag: String,
+          },
+        ],
       },
       friends: [
         {
@@ -542,6 +547,16 @@ describe('Memory connector', function() {
       });
     });
 
+    it('should support multi-level nested array property in query', function(done) {
+      User.find({where: {'address.tags.tag': 'business'}}, function(err, users) {
+        should.not.exist(err);
+        users.length.should.be.equal(1);
+        users[0].address.tags[0].tag.should.be.equal('business');
+        users[0].address.tags[1].tag.should.be.equal('rent');
+        done();
+      });
+    });
+
     function seed(done) {
       var beatles = [
         {
@@ -556,6 +571,10 @@ describe('Memory connector', function() {
             city: 'San Jose',
             state: 'CA',
             zipCode: '95131',
+            tags: [
+                {tag: 'business'},
+                {tag: 'rent'},
+            ],
           },
           friends: [
             {name: 'Paul McCartney'},