#29155: Using contains field lookup with Substr database function cause
modification of second parameter of Substr
-------------------------------------+-------------------------------------
Reporter: norac89 | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 2.0
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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My model:
{{{
class User(models.Model):
field1 = models.Charfield(max_length=120)
field2 = models.Charfield(max_length=120)
}}}
Tried querying the model to get User instances in which field2 start with
the three first characters of field1.
Tried the following:
{{{
User.objects.filter(field2__startswith=Substr(F('field1'), 1, 3))
}}}
I m getting the following error
{{{
psycopg2.DataError: invalid input syntax for integer: "1%"
LINE 1: ...(REPLACE(REPLACE((SUBSTRING("test_user"."field1", '1%', 3)),...
}}}
The second parameter of the substr function seems to be replaced with
'1%'.
--
Ticket URL: <https://code.djangoproject.com/ticket/29155>
Django <https://code.djangoproject.com/>
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