ArrayField exact querying doesn't work with CharField

[Erik Cederstrand]

This is a variation of https://code.djangoproject.com/ticket/22907, except with = instead of __contains. When trying to make an exact match on a char ArrayField:

CharArrayModel.objects.filter(field=['text'])

I get:

ProgrammingError: operator does not exist: character varying[] = text[]
LINE 1: ...el" WHERE "postgres_tests_chararraymodel"."field" = ARRAY['...
                                                             ^
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.

The same happens if I use __exact.

[Erik Cederstrand]

I stumbled upon this because I was trying to edit a unique=True ArrayField via the admin. Before saving, the admin does a check along the lines of CharArrayModel.objects.filter(field=['my_new_text']).exclude(pk=self.pk).

[Dmitry Dygalo]

PR: ​https://github.com/django/django/pull/5575

[Simon Charette]

#25091 was a duplicate.

[Tim Graham <timograham@…>]

In 263b3d2b:

Fixed #25666 -- Fixed the exact lookup of ArrayField.

[Tim Graham <timograham@…>]

In e9c9f2ed:

[1.8.x] Fixed #25666 -- Fixed the exact lookup of ArrayField.

Backport of 263b3d2ba132ea443193dc0b728741317742c8d3 from master

[Tim Graham <timograham@…>]

In fe79bc3e:

[1.9.x] Fixed #25666 -- Fixed the exact lookup of ArrayField.

Backport of 263b3d2ba132ea443193dc0b728741317742c8d3 from master