PostgreSQL specific model fields - ArrayField: Type Mismatch

[Pal]

When you define ArrayField as models.CharField, the query fails. But if you define ArrayField as models.TextField, the query succeeds.

Not Working: ArrayField(models.CharField(max_length=200), blank=True)

Working: ArrayField(models.TextField(blank=True))

[Simon Charette]

Could you provide a traceback and more details about how it fails?

Does it happen when you define a model using ArrayField(CharField()), when performing a query annotation?

[Pal]

Replying to Simon Charette:

Could you provide a traceback and more details about how it fails?

Does it happen when you define a model using ArrayField(CharField()), when performing a query annotation?

Yes. When I defined the model as shown in the documentation at ​https://docs.djangoproject.com/en/2.0/ref/contrib/postgres/fields/#querying-arrayfield , the query fails. But if I change models.CharField to models.TextField, the query succeeds.

Here are the error statements from apache2 error log:
psycopg2.ProgrammingError: operator does not exist: text[] @> character varying[]
django.db.utils.ProgrammingError: operator does not exist: text[] @> character varying[]

May be we need to change the documentation to reflect the change above. Thanks.

[Tim Graham]

Please show the model and the query. Perhaps you could write it as a test for tests/postgres_tests/test_array.py using CharArrayModel.

[Pal]

Replying to Tim Graham:

Please show the model and the query. Perhaps you could write it as a test for tests/postgres_tests/test_array.py using CharArrayModel.

One thing I want to mention is that this table was already created in Postgres and I am adding that to the models.py. As I said, if I define as ArrayField(models.CharField...), query does not work where as ArrayField(models.TextField...) works. So someone can test and verify this. Thanks.

[Tim Graham]

I'm still not sure we have enough details to reproduce the issue. What does the SQL for the table look like, what does your model look like, and what does the failing QuerySet look like?