feat(where): explicit casting with attribute::integer for json nested querying

lib/dialects/abstract/query-generator.js

@@ -1759,7 +1759,17 @@ module.exports = (function() {
           traverse = function (prop, item, path) {
             var $where = {}
               , $key
-              , $baseKey = self.quoteIdentifier(key)+'#>>\'{'+path.join(', ')+'}\'';
+              , $cast
+              , $baseKey
+              , $tmp;
+
+            if (path[path.length - 1].indexOf('::') > -1) {
+              $tmp = path[path.length - 1].split('::');
+              $cast = $tmp[1];
+              path[path.length - 1] = $tmp[0];
+            }
+
+            $baseKey = self.quoteIdentifier(key)+'#>>\'{'+path.join(', ')+'}\'';
 
             if (options.prefix) {
               if (options.prefix instanceof Utils.literal) {
@@ -1777,12 +1787,18 @@ module.exports = (function() {
                   $where[$prop] = $item;
                   $key = $baseKey;
 
-                  if (typeof $item === 'number') {
-                    $key += '::double precision';
+                  if (!$cast) {
+                    if (typeof $item === 'number') {
+                      $cast = 'double precision';
+                    }
+
+                    if ($item instanceof Date) {
+                      $cast = 'timestamptz';
+                    }
                   }
 
-                  if ($item instanceof Date) {
-                    $key += '::timestamptz';
+                  if ($cast) {
+                    $key += '::'+$cast;
                   }
 
                   $items.push(self.whereItemQuery(new Utils.literal($key), $where/*, _.pick(options, 'prefix')*/));

test/unit/sql/where.test.js

@@ -550,6 +550,20 @@ suite(Support.getTestDialectTeaser('SQL'), function() {
 
         testsql('data', {
           nested: {
+            "attribute::integer": {
+              $gt: 2
+            }
+          }
+        }, {
+          field: {
+            type: new DataTypes.JSONB()
+          }
+        }, {
+          default: "([data]#>>'{nested, attribute}')::integer > 2"
+        });
+
+        testsql('data', {
+          nested: {
             attribute: {
               $gt: new Date()
             }