fix(): Fix regression with arrays and objects with multiple keys. closes #3107

changelog.md

 # Next
 - [BUG] Fixed regression with `DataTypes.ARRAY(DataTypes.STRING(length))` #3106
+- [BUG] Fixed regression where `.or([{key: value}, {key: value, key2: value}])` would result in 3 `A OR B OR C` rather than `A OR (B AND C)` #3107
 
 # 2.0.1
 - [BUG] Fixed issue with empty `include.where`

lib/dialects/abstract/query-generator.js

@@ -1660,7 +1660,9 @@ module.exports = (function() {
 
         if (Array.isArray(value)) {
           value = value.map(function (item) {
-            return self.whereItemsQuery(item, options, binding);
+            var itemQuery = self.whereItemsQuery(item, options, ' AND ');
+            if (Object.keys(item).length > 1) itemQuery = '('+itemQuery+')';
+            return itemQuery;
           }).filter(function (item) {
             return item && item.length;
           });

test/unit/sql/where.test.js

@@ -170,6 +170,17 @@ suite(Support.getTestDialectTeaser('SQL'), function() {
           default: '([equipment] IN (1, 3) OR [muscles] IN (2, 4))'
         });
 
+        testsql('$or', [
+          {
+            roleName: 'NEW'
+          }, {
+            roleName: 'CLIENT',
+            type: 'CLIENT'
+          }
+        ], {
+          default: "([roleName] = 'NEW' OR ([roleName] = 'CLIENT' AND [type] = 'CLIENT'))"
+        });
+
         test("sequelize.or({group_id: 1}, {user_id: 2})", function () {
           expectsql(sql.whereItemQuery(undefined, this.sequelize.or({group_id: 1}, {user_id: 2})), {
             default: "([group_id] = 1 OR [user_id] = 2)"