bug(json) Cast to boolean when querying JSON. Closes #4257

changelog.md

@@ -2,6 +2,7 @@
 - [FIXED] Fall back to a default version when parsing the DB version fails [#4368](https://github.com/sequelize/sequelize/issues/4368)
 - [FIXED] Fix a bug where passing null as the second parameter to `sequelize.where` would fail [#4334](https://github.com/sequelize/sequelize/issues/4334)
 - [FIXED] An error is thrown if a column called `id` is added, but not marked as primary key, and no other pk is present. [#4139](https://github.com/sequelize/sequelize/issues/4139)
+- [FIXED] Cast to boolean when querying JSON [#4257](https://github.com/sequelize/sequelize/issues/4257)
 
 # 3.6.0
 - [ADDED] Model.findCreateFind: A more performant findOrCreate that will not work under a transaction (atleast not in postgres)

lib/dialects/abstract/query-generator.js

@@ -1986,10 +1986,10 @@ var QueryGenerator = {
             if (!$cast) {
               if (typeof $item === 'number') {
                 $cast = 'double precision';
-              }
-
-              if ($item instanceof Date) {
+              } else if ($item instanceof Date) {
                 $cast = 'timestamptz';
+              } else if (typeof $item === 'boolean') {
+                $cast = 'boolean';
               }
             }
 

test/unit/sql/where.test.js

@@ -647,6 +647,18 @@ suite(Support.getTestDialectTeaser('SQL'), function() {
         });
 
         testsql('data', {
+          nested: {
+            attribute: true
+          }
+        }, {
+          field: {
+            type: new DataTypes.JSONB()
+          }
+        }, {
+          default: "([data]#>>'{nested, attribute}')::boolean = true"
+        });
+
+        testsql('data', {
           $contains: {
             company: 'Magnafone'
           }