Fixed #28291, #24726 -- Fixed ArrayField with JSONField and RangeFields.

AUTHORS

@@ -851,6 +851,7 @@ answer newbie questions, and generally made Django that much better:
     viestards.lists@gmail.com
     Viktor Danyliuk <v.v.danyliuk@gmail.com>
     Ville Säävuori <http://www.unessa.net/>
+    Vinay Karanam <https://github.com/vinayinvicible>
     Vinay Sajip <vinay_sajip@yahoo.co.uk>
     Vincent Foley <vfoleybourgon@yahoo.ca>
     Vitaly Babiy <vbabiy86@gmail.com>

django/contrib/postgres/fields/array.py

@@ -84,6 +84,9 @@ class ArrayField(CheckFieldDefaultMixin, Field):
         size = self.size or ''
         return '%s[%s]' % (self.base_field.db_type(connection), size)
 
+    def get_placeholder(self, value, compiler, connection):
+        return '%s::{}'.format(self.db_type(connection))
+
     def get_db_prep_value(self, value, connection, prepared=False):
         if isinstance(value, (list, tuple)):
             return [self.base_field.get_db_prep_value(i, connection, prepared=False) for i in value]

tests/postgres_tests/migrations/0002_create_test_models.py

@@ -60,6 +60,9 @@ class Migration(migrations.Migration):
                 ('uuids', ArrayField(models.UUIDField(), size=None)),
                 ('decimals', ArrayField(models.DecimalField(max_digits=5, decimal_places=2), size=None)),
                 ('tags', ArrayField(TagField(), blank=True, null=True, size=None)),
+                ('json', ArrayField(JSONField(default={}), default=[])),
+                ('int_ranges', ArrayField(IntegerRangeField(), null=True, blank=True)),
+                ('bigint_ranges', ArrayField(BigIntegerRangeField(), null=True, blank=True)),
             ],
             options={
                 'required_db_vendor': 'postgresql',

tests/postgres_tests/models.py

@@ -67,6 +67,9 @@ class OtherTypesArrayModel(PostgreSQLModel):
     uuids = ArrayField(models.UUIDField())
     decimals = ArrayField(models.DecimalField(max_digits=5, decimal_places=2))
     tags = ArrayField(TagField(), blank=True, null=True)
+    json = ArrayField(JSONField(default=dict), default=list)
+    int_ranges = ArrayField(IntegerRangeField(), blank=True, null=True)
+    bigint_ranges = ArrayField(BigIntegerRangeField(), blank=True, null=True)
 
 
 class HStoreModel(PostgreSQLModel):

tests/postgres_tests/test_array.py

@@ -24,6 +24,7 @@ try:
     from django.contrib.postgres.forms import (
         SimpleArrayField, SplitArrayField, SplitArrayWidget,
     )
+    from psycopg2.extras import NumericRange
 except ImportError:
     pass
 
@@ -96,6 +97,12 @@ class TestSaveLoad(PostgreSQLTestCase):
             uuids=[uuid.uuid4()],
             decimals=[decimal.Decimal(1.25), 1.75],
             tags=[Tag(1), Tag(2), Tag(3)],
+            json=[{'a': 1}, {'b': 2}],
+            int_ranges=[NumericRange(10, 20), NumericRange(30, 40)],
+            bigint_ranges=[
+                NumericRange(7000000000, 10000000000),
+                NumericRange(50000000000, 70000000000),
+            ]
         )
         instance.save()
         loaded = OtherTypesArrayModel.objects.get()
@@ -103,6 +110,9 @@ class TestSaveLoad(PostgreSQLTestCase):
         self.assertEqual(instance.uuids, loaded.uuids)
         self.assertEqual(instance.decimals, loaded.decimals)
         self.assertEqual(instance.tags, loaded.tags)
+        self.assertEqual(instance.json, loaded.json)
+        self.assertEqual(instance.int_ranges, loaded.int_ranges)
+        self.assertEqual(instance.bigint_ranges, loaded.bigint_ranges)
 
     def test_null_from_db_value_handling(self):
         instance = OtherTypesArrayModel.objects.create(
@@ -113,6 +123,9 @@ class TestSaveLoad(PostgreSQLTestCase):
         )
         instance.refresh_from_db()
         self.assertIsNone(instance.tags)
+        self.assertEqual(instance.json, [])
+        self.assertIsNone(instance.int_ranges)
+        self.assertIsNone(instance.bigint_ranges)
 
     def test_model_set_on_base_field(self):
         instance = IntegerArrayModel()