#29171 closed Bug (worksforme)

PostgreSQL specific model fields - ArrayField: Type Mismatch

Reported by: Pal Owned by: nobody
Component: Database layer (models, ORM) Version: 2.0
Severity: Normal Keywords: Postgres Array Query
Cc: felixxm Triage Stage: Unreviewed
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

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))

Change History (8)

comment:1 Changed 20 months ago by Pal

Type: UncategorizedBug

comment:2 Changed 20 months ago by 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?

comment:3 in reply to:  2 Changed 20 months ago by 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.

comment:4 Changed 20 months ago by felixxm

Cc: felixxm added

comment:5 Changed 20 months ago by 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.

comment:6 in reply to:  5 Changed 20 months ago by 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.

Last edited 20 months ago by Pal (previous) (diff)

comment:7 Changed 20 months ago by 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?

comment:8 Changed 19 months ago by Pal

Resolution: worksforme
Status: newclosed
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