[Django] #27808: Nested ArrayField with nullable base field generates invalid SQL

[Django]

#27808: Nested ArrayField with nullable base field generates invalid SQL
--------------------------------------------+------------------------
               Reporter:  Josef Kolář       |          Owner:  (none)
                   Type:  Bug               |         Status:  new
              Component:  contrib.postgres  |        Version:  1.9
               Severity:  Normal            |       Keywords:
           Triage Stage:  Unreviewed        |      Has patch:  0
    Needs documentation:  0                 |    Needs tests:  0
Patch needs improvement:  0                 |  Easy pickings:  0
                  UI/UX:  0                 |
--------------------------------------------+------------------------
 When I have model
 {{{#!python
 class NestedNullableIntegerArrayModel(PostgreSQLModel):
     field = ArrayField(ArrayField(models.IntegerField(null=True)))
 }}}
 and trying to save data
 {{{#!python
 instance = NestedNullableIntegerArrayModel(field=[[None, None], [None,
 None]])
     instance.save()
 }}}
 and Django generates
 {{{#!SQL
 INSERT INTO "postgres_tests_nestednullableintegerarraymodel" ("field")
 VALUES (%s) RETURNING
 "postgres_tests_nestednullableintegerarraymodel"."id"
 }}}

--
Ticket URL: <https://code.djangoproject.com/ticket/27808>
Django <https://code.djangoproject.com/>
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