#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 | -------------------------------------+------------------------------------- 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/> The Web framework for perfectionists with deadlines. -- You received this message because you are subscribed to the Google Groups "Django updates" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-updates+unsubscr...@googlegroups.com. To post to this group, send email to django-updates@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-updates/050.4e6aba39405b6e63587c6bff258327b8%40djangoproject.com. For more options, visit https://groups.google.com/d/optout.