Repository: kayak/pypika (python)
Issue: INSERT with subquery doesn't wrap with parentheses
Using v0.25.1, if I try to do an insert where one of the values is a subquery, pypika doesn't wrap the subquery in parentheses within the `VALUES` section.

```python
purchase_order_item = pypika.Table("purchase_order_item")
part = pypika.Table("part")

subquery = (
            pypika.MySQLQuery.from_(part)
            .select(part.part_id)
            .where(part.part_number == "FOOBAR")
        )

pypika.MySQLQuery.into(purchase_order_item).columns(purchase_order_item.id_part, purchase_order_item.id_customer).insert(subquery, 12345)
```

The above code generates this invalid query...
```sql
INSERT INTO `purchase_order_item` 
(`id_part`,`id_customer`) 
VALUES 
(SELECT `part_id` FROM `part` WHERE `part_number`='FOOBAR',12345)
```

When it should be...
```sql
INSERT INTO `purchase_order_item` 
(`id_part`,`id_customer`) 
VALUES 
((SELECT `part_id` FROM `part` WHERE `part_number`='FOOBAR'),12345)
```
Pull request description: Fixes #220 Added missing subquery=True kwarg to insert values sql

Patch:
diff --git a/README.rst b/README.rst
index 91ef64f..8797a4b 100644
--- a/README.rst
+++ b/README.rst
@@ -15,14 +15,6 @@ building SQL queries without limiting the flexibility of handwritten SQL. Design
 leverages the builder design pattern to construct queries to avoid messy string formatting and concatenation. It is also
 easily extended to take full advantage of specific features of SQL database vendors.
 
-What are the design goals for |Brand|?
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-|Brand| is a fast, expressive and flexible way to replace handwritten SQL (or even ORM for the courageous souls amongst you).
-Validation of SQL correctness is not an explicit goal of |Brand|. With such a large number of
-SQL database vendors providing a robust validation of input data is difficult. Instead you are encouraged to check inputs you provide to |Brand| or appropriately handle errors raised from
-your SQL database - just as you would have if you were writing SQL yourself.
-
 .. _intro_end:
 
 Read the docs: http://pypika.readthedocs.io/en/latest/
diff --git a/pypika/queries.py b/pypika/queries.py
index 98efc49..d6e8df0 100644
--- a/pypika/queries.py
+++ b/pypika/queries.py
@@ -142,7 +142,6 @@ class Table(Selectable):
             return "Table('{}', schema='{}')".format(self._table_name, self._schema)
         return "Table('{}')".format(self._table_name)
 
-
     def __ne__(self, other):
         return not self.__eq__(other)
 
@@ -840,12 +839,12 @@ class QueryBuilder(Selectable, Term):
 
     def _with_sql(self, **kwargs):
         return 'WITH ' + ','.join(
-            clause.name + ' AS (' + clause.get_sql(
-                subquery=False,
-                with_alias=False,
-                **kwargs) +
-            ') '
-            for clause in self._with)
+              clause.name + ' AS (' + clause.get_sql(
+                    subquery=False,
+                    with_alias=False,
+                    **kwargs) +
+              ') '
+              for clause in self._with)
 
     def _select_sql(self, **kwargs):
         return 'SELECT {distinct}{select}'.format(
@@ -881,12 +880,12 @@ class QueryBuilder(Selectable, Term):
         )
 
     def _values_sql(self, **kwargs):
-        return ' VALUES ({values})'.format(
-              values='),('.join(','.join(term.get_sql(with_alias=True, **kwargs)
-                                         for term in row)
-                                for row in self._values)
-
-        )
+        return ' VALUES ({values})' \
+            .format(values='),('
+                    .join(','
+                          .join(term.get_sql(with_alias=True, subquery=True, **kwargs)
+                                   for term in row)
+                          for row in self._values))
 
     def _into_sql(self, **kwargs):
         return ' INTO {table}'.format(
@@ -1019,6 +1018,7 @@ class Joiner(object):
 
         return self.query
 
+
 class Join(object):
     def __init__(self, item, how):
         self.item = item


Test patch:
diff --git a/pypika/tests/test_inserts.py b/pypika/tests/test_inserts.py
index cd51ddd..682140a 100644
--- a/pypika/tests/test_inserts.py
+++ b/pypika/tests/test_inserts.py
@@ -70,7 +70,7 @@ class InsertIntoTests(unittest.TestCase):
 
     def test_insert_all_columns_multi_rows_chained_mixed(self):
         query = Query.into(self.table_abc).insert(
-            (1, 'a', True), (2, 'b', False)
+              (1, 'a', True), (2, 'b', False)
         ).insert(3, 'c', True)
 
         self.assertEqual('INSERT INTO "abc" VALUES '
@@ -90,7 +90,7 @@ class InsertIntoTests(unittest.TestCase):
 
     def test_insert_selected_columns(self):
         query = Query.into(self.table_abc).columns(
-            self.table_abc.foo, self.table_abc.bar, self.table_abc.buz
+              self.table_abc.foo, self.table_abc.bar, self.table_abc.buz
         ).insert(1, 'a', True)
 
         self.assertEqual('INSERT INTO "abc" ("foo","bar","buz") VALUES (1,\'a\',true)', str(query))
@@ -126,14 +126,14 @@ class PostgresInsertIntoOnConflictTests(unittest.TestCase):
 
     def test_insert_on_conflict_do_update_field(self):
         query = PostgreSQLQuery.into(self.table_abc).insert(1, "m").on_conflict(
-            self.table_abc.id).do_update(self.table_abc.name, "m")
+              self.table_abc.id).do_update(self.table_abc.name, "m")
 
         self.assertEqual('INSERT INTO "abc" VALUES (1,\'m\') ON CONFLICT (id) DO UPDATE SET name=\'m\'',
-         str(query))
+                         str(query))
 
     def test_insert_on_conflict_do_update_field_str(self):
         query = PostgreSQLQuery.into(self.table_abc).insert(1, "m").on_conflict(
-            'id').do_update('name', "m")
+              'id').do_update('name', "m")
 
         self.assertEqual('INSERT INTO "abc" VALUES (1,\'m\') ON CONFLICT (id) DO UPDATE SET name=\'m\'', str(query))
 
@@ -144,12 +144,12 @@ class PostgresInsertIntoOnConflictTests(unittest.TestCase):
     def test_insert_on_conflict_two_handlers_do_nothing(self):
         with self.assertRaises(QueryException):
             query = PostgreSQLQuery.into(self.table_abc).insert(1).on_conflict(
-                'id').do_nothing().do_update(self.table_abc.name, "m")
-    
+                  'id').do_nothing().do_update(self.table_abc.name, "m")
+
     def test_insert_on_conflict_two_handlers_do_update(self):
         with self.assertRaises(QueryException):
             query = PostgreSQLQuery.into(self.table_abc).insert(1).on_conflict(
-                self.table_abc.id).do_update(self.table_abc.name, "m").do_nothing()
+                  self.table_abc.id).do_update(self.table_abc.name, "m").do_nothing()
 
     def test_non_insert_on_conflict_do_nothing(self):
         with self.assertRaises(QueryException):
@@ -158,7 +158,8 @@ class PostgresInsertIntoOnConflictTests(unittest.TestCase):
     def test_non_insert_on_conflict_do_update(self):
         with self.assertRaises(QueryException):
             query = PostgreSQLQuery.update(self.table_abc).set('foo', 'bar').on_conflict(
-                'id').do_update(['name'], ["m"])
+                  'id').do_update(['name'], ["m"])
+
 
 class PostgresInsertIntoReturningTests(unittest.TestCase):
     table_abc = Table('abc')
@@ -180,33 +181,33 @@ class PostgresInsertIntoReturningTests(unittest.TestCase):
 
     def test_insert_returning_all_fields_and_arithmetics(self):
         query = PostgreSQLQuery.into(self.table_abc).insert(1).returning(
-            self.table_abc.star,
-            self.table_abc.f1 + self.table_abc.f2
+              self.table_abc.star,
+              self.table_abc.f1 + self.table_abc.f2
         )
 
         self.assertEqual('INSERT INTO "abc" VALUES (1) RETURNING *,f1+f2', str(query))
 
     def test_insert_all_columns_multi_rows_chained_returning_star(self):
         query = PostgreSQLQuery.into(
-            self.table_abc
+              self.table_abc
         ).insert(1, 'a', True).insert(2, 'b', False).returning(self.table_abc.star)
 
         self.assertEqual('INSERT INTO "abc" VALUES (1,\'a\',true),(2,\'b\',false) RETURNING *', str(query))
 
     def test_insert_all_columns_multi_rows_chained_returning_star_and_id(self):
         query = PostgreSQLQuery.into(
-            self.table_abc
+              self.table_abc
         ).insert(1, 'a', True).insert(2, 'b', False).returning(
-            self.table_abc.name,
-            self.table_abc.star,
-            self.table_abc.id,
+              self.table_abc.name,
+              self.table_abc.star,
+              self.table_abc.id,
         )
 
         self.assertEqual('INSERT INTO "abc" VALUES (1,\'a\',true),(2,\'b\',false) RETURNING *', str(query))
 
     def test_insert_all_columns_multi_rows_chained_returning_star_str(self):
         query = PostgreSQLQuery.into(
-            self.table_abc
+              self.table_abc
         ).insert(1, 'a', True).insert(2, 'b', False).returning('*')
 
         self.assertEqual('INSERT INTO "abc" VALUES (1,\'a\',true),(2,\'b\',false) RETURNING *', str(query))
@@ -245,70 +246,70 @@ class InsertIntoOnDuplicateTests(unittest.TestCase):
     table_abc = Table('abc')
 
     def test_insert_one_column(self):
-        query = MySQLQuery\
-            .into(self.table_abc).insert(1)\
+        query = MySQLQuery \
+            .into(self.table_abc).insert(1) \
             .on_duplicate_key_update(self.table_abc.foo, self.table_abc.foo)
         self.assertEqual('INSERT INTO `abc` VALUES (1) ON DUPLICATE KEY UPDATE `foo`=`foo`', str(query))
 
     def test_insert_one_column_using_values(self):
-        query = MySQLQuery\
-            .into(self.table_abc).insert(1)\
+        query = MySQLQuery \
+            .into(self.table_abc).insert(1) \
             .on_duplicate_key_update(self.table_abc.foo, Values(self.table_abc.foo))
         self.assertEqual('INSERT INTO `abc` VALUES (1) ON DUPLICATE KEY UPDATE `foo`=VALUES(`foo`)', str(query))
 
     def test_insert_one_column_single_element_array(self):
-        query = MySQLQuery\
-            .into(self.table_abc).insert((1,))\
+        query = MySQLQuery \
+            .into(self.table_abc).insert((1,)) \
             .on_duplicate_key_update(self.table_abc.foo, self.table_abc.foo)
 
         self.assertEqual('INSERT INTO `abc` VALUES (1) ON DUPLICATE KEY UPDATE `foo`=`foo`', str(query))
 
     def test_insert_one_column_multi_element_array(self):
-        query = MySQLQuery\
-            .into(self.table_abc).insert((1,), (2,))\
+        query = MySQLQuery \
+            .into(self.table_abc).insert((1,), (2,)) \
             .on_duplicate_key_update(self.table_abc.foo, self.table_abc.foo)
 
         self.assertEqual('INSERT INTO `abc` VALUES (1),(2) ON DUPLICATE KEY UPDATE `foo`=`foo`', str(query))
 
     def test_insert_multiple_columns_on_duplicate_update_one_with_same_value(self):
-        query = MySQLQuery\
-            .into(self.table_abc).insert(1, 'a')\
+        query = MySQLQuery \
+            .into(self.table_abc).insert(1, 'a') \
             .on_duplicate_key_update(self.table_abc.bar, Values(self.table_abc.bar))
 
         self.assertEqual('INSERT INTO `abc` VALUES (1,\'a\') ON DUPLICATE KEY UPDATE `bar`=VALUES(`bar`)', str(query))
 
     def test_insert_multiple_columns_on_duplicate_update_one_with_different_value(self):
-        query = MySQLQuery\
+        query = MySQLQuery \
             .into(self.table_abc).insert(1, 'a') \
             .on_duplicate_key_update(self.table_abc.bar, 'b')
 
         self.assertEqual('INSERT INTO `abc` VALUES (1,\'a\') ON DUPLICATE KEY UPDATE `bar`=\'b\'', str(query))
 
     def test_insert_multiple_columns_on_duplicate_update_one_with_expression(self):
-        query = MySQLQuery\
+        query = MySQLQuery \
             .into(self.table_abc).insert(1, 2) \
-            .on_duplicate_key_update(self.table_abc.bar, 4+F('bar'))  # todo sql expression? not python
+            .on_duplicate_key_update(self.table_abc.bar, 4 + F('bar'))  # todo sql expression? not python
 
         self.assertEqual('INSERT INTO `abc` VALUES (1,2) ON DUPLICATE KEY UPDATE `bar`=4+`bar`', str(query))
 
     def test_insert_multiple_columns_on_duplicate_update_one_with_expression_using_original_field_value(self):
-        query = MySQLQuery\
-            .into(self.table_abc).insert(1, 'a')\
+        query = MySQLQuery \
+            .into(self.table_abc).insert(1, 'a') \
             .on_duplicate_key_update(self.table_abc.bar, fn.Concat(self.table_abc.bar, 'update'))
 
         self.assertEqual(
-            'INSERT INTO `abc` VALUES (1,\'a\') ON DUPLICATE KEY UPDATE `bar`=CONCAT(`bar`,\'update\')',
-            str(query)
+              'INSERT INTO `abc` VALUES (1,\'a\') ON DUPLICATE KEY UPDATE `bar`=CONCAT(`bar`,\'update\')',
+              str(query)
         )
 
     def test_insert_multiple_columns_on_duplicate_update_one_with_expression_using_values(self):
-        query = MySQLQuery\
-            .into(self.table_abc).insert(1, 'a')\
+        query = MySQLQuery \
+            .into(self.table_abc).insert(1, 'a') \
             .on_duplicate_key_update(self.table_abc.bar, fn.Concat(Values(self.table_abc.bar), 'update'))
 
         self.assertEqual(
-            'INSERT INTO `abc` VALUES (1,\'a\') ON DUPLICATE KEY UPDATE `bar`=CONCAT(VALUES(`bar`),\'update\')',
-            str(query)
+              'INSERT INTO `abc` VALUES (1,\'a\') ON DUPLICATE KEY UPDATE `bar`=CONCAT(VALUES(`bar`),\'update\')',
+              str(query)
         )
 
     def test_insert_multiple_columns_on_duplicate_update_multiple(self):
@@ -318,45 +319,45 @@ class InsertIntoOnDuplicateTests(unittest.TestCase):
             .on_duplicate_key_update(self.table_abc.baz, 'c')
 
         self.assertEqual(
-            'INSERT INTO `abc` VALUES (1,\'a\',\'b\') ON DUPLICATE KEY UPDATE `bar`=\'b\',`baz`=\'c\'',
-            str(query)
+              'INSERT INTO `abc` VALUES (1,\'a\',\'b\') ON DUPLICATE KEY UPDATE `bar`=\'b\',`baz`=\'c\'',
+              str(query)
         )
 
     def test_insert_multi_rows_chained_mixed_on_duplicate_update_multiple(self):
-        query = MySQLQuery.into(self.table_abc)\
-            .insert((1, 'a', True), (2, 'b', False))\
-            .insert(3, 'c', True)\
-            .on_duplicate_key_update(self.table_abc.foo, self.table_abc.foo)\
+        query = MySQLQuery.into(self.table_abc) \
+            .insert((1, 'a', True), (2, 'b', False)) \
+            .insert(3, 'c', True) \
+            .on_duplicate_key_update(self.table_abc.foo, self.table_abc.foo) \
             .on_duplicate_key_update(self.table_abc.bar, Values(self.table_abc.bar))
 
         self.assertEqual(
-            'INSERT INTO `abc` VALUES (1,\'a\',true),(2,\'b\',false),(3,\'c\',true) '
-            'ON DUPLICATE KEY UPDATE `foo`=`foo`,`bar`=VALUES(`bar`)',
-            str(query)
+              'INSERT INTO `abc` VALUES (1,\'a\',true),(2,\'b\',false),(3,\'c\',true) '
+              'ON DUPLICATE KEY UPDATE `foo`=`foo`,`bar`=VALUES(`bar`)',
+              str(query)
         )
 
     def test_insert_selected_columns_on_duplicate_update_one(self):
-        query = MySQLQuery.into(self.table_abc)\
-            .columns(self.table_abc.foo, self.table_abc.bar, self.table_abc.baz)\
-            .insert(1, 'a', True)\
+        query = MySQLQuery.into(self.table_abc) \
+            .columns(self.table_abc.foo, self.table_abc.bar, self.table_abc.baz) \
+            .insert(1, 'a', True) \
             .on_duplicate_key_update(self.table_abc.baz, False)
 
         self.assertEqual(
-            'INSERT INTO `abc` (`foo`,`bar`,`baz`) VALUES (1,\'a\',true) ON DUPLICATE KEY UPDATE `baz`=false',
-            str(query)
+              'INSERT INTO `abc` (`foo`,`bar`,`baz`) VALUES (1,\'a\',true) ON DUPLICATE KEY UPDATE `baz`=false',
+              str(query)
         )
 
     def test_insert_selected_columns_on_duplicate_update_multiple(self):
-        query = MySQLQuery.into(self.table_abc)\
-            .columns(self.table_abc.foo, self.table_abc.bar, self.table_abc.baz)\
-            .insert(1, 'a', True)\
-            .on_duplicate_key_update(self.table_abc.baz, False)\
+        query = MySQLQuery.into(self.table_abc) \
+            .columns(self.table_abc.foo, self.table_abc.bar, self.table_abc.baz) \
+            .insert(1, 'a', True) \
+            .on_duplicate_key_update(self.table_abc.baz, False) \
             .on_duplicate_key_update(self.table_abc.bar, Values(self.table_abc.bar))
 
         self.assertEqual(
-            'INSERT INTO `abc` (`foo`,`bar`,`baz`) VALUES (1,\'a\',true) '
-            'ON DUPLICATE KEY UPDATE `baz`=false,`bar`=VALUES(`bar`)',
-            str(query)
+              'INSERT INTO `abc` (`foo`,`bar`,`baz`) VALUES (1,\'a\',true) '
+              'ON DUPLICATE KEY UPDATE `baz`=false,`bar`=VALUES(`bar`)',
+              str(query)
         )
 
     def test_insert_none_skipped(self):
@@ -385,7 +386,7 @@ class InsertSelectFromTests(unittest.TestCase):
 
     def test_insert_from_columns(self):
         query = Query.into(self.table_abc).from_(self.table_efg).select(
-            self.table_efg.fiz, self.table_efg.buz, self.table_efg.baz
+              self.table_efg.fiz, self.table_efg.buz, self.table_efg.baz
         )
 
         self.assertEqual('INSERT INTO "abc" '
@@ -393,7 +394,7 @@ class InsertSelectFromTests(unittest.TestCase):
 
     def test_insert_columns_from_star(self):
         query = Query.into(self.table_abc).columns(
-            self.table_abc.foo, self.table_abc.bar, self.table_abc.buz,
+              self.table_abc.foo, self.table_abc.bar, self.table_abc.buz,
         ).from_(self.table_efg).select('*')
 
         self.assertEqual('INSERT INTO "abc" ("foo","bar","buz") '
@@ -401,9 +402,9 @@ class InsertSelectFromTests(unittest.TestCase):
 
     def test_insert_columns_from_columns(self):
         query = Query.into(self.table_abc).columns(
-            self.table_abc.foo, self.table_abc.bar, self.table_abc.buz
+              self.table_abc.foo, self.table_abc.bar, self.table_abc.buz
         ).from_(self.table_efg).select(
-            self.table_efg.fiz, self.table_efg.buz, self.table_efg.baz
+              self.table_efg.fiz, self.table_efg.buz, self.table_efg.baz
         )
 
         self.assertEqual('INSERT INTO "abc" ("foo","bar","buz") '
@@ -411,13 +412,13 @@ class InsertSelectFromTests(unittest.TestCase):
 
     def test_insert_columns_from_columns_with_join(self):
         query = Query.into(self.table_abc).columns(
-            self.table_abc.c1, self.table_abc.c2, self.table_abc.c3, self.table_abc.c4
+              self.table_abc.c1, self.table_abc.c2, self.table_abc.c3, self.table_abc.c4
         ).from_(self.table_efg).select(
-            self.table_efg.foo, self.table_efg.bar
+              self.table_efg.foo, self.table_efg.bar
         ).join(self.table_hij).on(
-            self.table_efg.id == self.table_hij.abc_id
+              self.table_efg.id == self.table_hij.abc_id
         ).select(
-            self.table_hij.fiz, self.table_hij.buz
+              self.table_hij.fiz, self.table_hij.buz
         )
 
         self.assertEqual('INSERT INTO "abc" ("c1","c2","c3","c4") '
@@ -425,6 +426,22 @@ class InsertSelectFromTests(unittest.TestCase):
                          'JOIN "hij" ON "efg"."id"="hij"."abc_id"', str(query))
 
 
+class InsertSubqueryTests(unittest.TestCase):
+    def test_insert_subquery_wrapped_in_brackets(self):
+        purchase_order_item, part = Tables("purchase_order_item", "part")
+
+        q = Query.into(purchase_order_item) \
+            .columns(purchase_order_item.id_part, purchase_order_item.id_customer) \
+            .insert(Query.from_(part)
+                    .select(part.part_id)
+                    .where(part.part_number == "FOOBAR"), 12345)
+
+        self.assertEqual('INSERT INTO "purchase_order_item" '
+                         '("id_part","id_customer") '
+                         'VALUES '
+                         '((SELECT "part_id" FROM "part" WHERE "part_number"=\'FOOBAR\'),12345)', str(q))
+
+
 class SelectIntoTests(unittest.TestCase):
     table_abc, table_efg, table_hij = Tables('abc', 'efg', 'hij')
 
@@ -435,18 +452,18 @@ class SelectIntoTests(unittest.TestCase):
 
     def test_select_columns_into(self):
         query = Query.from_(self.table_abc).select(
-            self.table_abc.foo, self.table_abc.bar, self.table_abc.buz
+              self.table_abc.foo, self.table_abc.bar, self.table_abc.buz
         ).into(self.table_efg)
 
         self.assertEqual('SELECT "foo","bar","buz" INTO "efg" FROM "abc"', str(query))
 
     def test_select_columns_into_with_join(self):
         query = Query.from_(self.table_abc).select(
-            self.table_abc.foo, self.table_abc.bar
+              self.table_abc.foo, self.table_abc.bar
         ).join(self.table_hij).on(
-            self.table_abc.id == self.table_hij.abc_id
+              self.table_abc.id == self.table_hij.abc_id
         ).select(
-            self.table_hij.fiz, self.table_hij.buz
+              self.table_hij.fiz, self.table_hij.buz
         ).into(self.table_efg)
 
         self.assertEqual('SELECT "abc"."foo","abc"."bar","hij"."fiz","hij"."buz" '