id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
25091	Array field equality lookup fails with ProgrammingError	Villiers Strauss		"Note: This bug report is mostly based on a reddit post by Glueon: http://redd.it/38j43l

With the model:
{{{
class MyModel(models.Model):
    emails = ArrayField(models.EmailField())
}}}

When trying to fetch a row with a list of emails:

{{{
MyModel.objects.filter(emails=['test@test.com'])
}}}

the following error occurs:

{{{
ProgrammingError: operator does not exist: character varying[] = text[]
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.
}}}

Because the resulting query is:

{{{
SELECT * FROM some_table WHERE emails = ARRAY['test@test.com'];
}}}

By default type of `ARRAY['test@test.com']` is `text []` while Django stores it as a `varchar []`.

Glueon suggests that casting the array to `varchar []` using raw sql solves the problem:

{{{
SELECT * FROM some_table WHERE emails = ARRAY['test@test.com']::varchar[];
}}}

I did post some other workarounds in the comments of the reddit post, but there are some situations in which the workarounds are not possible, such as when using `get_or_create` or `update_or_create`."	Bug	closed	contrib.postgres	dev	Normal	duplicate			Accepted	1	0	0	0	0	0