#34861: KeyTextTransform incompatible with GeneratedField
-------------------------------------+-------------------------------------
     Reporter:  Paolo Melchiorre     |                    Owner:  nobody
         Type:  Bug                  |                   Status:  new
    Component:  Database layer       |                  Version:  5.0
  (models, ORM)                      |
     Severity:  Release blocker      |               Resolution:
     Keywords:  field, database,     |             Triage Stage:  Accepted
  generated, output_field            |
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------
Changes (by Simon Charette):

 * stage:  Unreviewed => Accepted


Comment:

 The issue lies in `GeneratedField.generated_sql`, it should not call
 `as_sql` directly as it doesn't account for `{vendor}_sql` overrides.

 It should let the compiler compile the expression instead, something like

 {{{#!diff
 diff --git a/django/db/models/fields/generated.py
 b/django/db/models/fields/generated.py
 index deb5875638..225d3e9d12 100644
 --- a/django/db/models/fields/generated.py
 +++ b/django/db/models/fields/generated.py
 @@ -61,12 +61,10 @@ def contribute_to_class(self, *args, **kwargs):
              self.register_lookup(lookup, lookup_name=lookup_name)

      def generated_sql(self, connection):
 -        return self._resolved_expression.as_sql(
 -            compiler=connection.ops.compiler("SQLCompiler")(
 -                self._query, connection=connection, using=None
 -            ),
 -            connection=connection,
 +        compiler = connection.ops.compiler("SQLCompiler")(
 +            self._query, connection=connection, using=None
          )
 +        return compiler.compile(self._resolved_expression)

      def check(self, **kwargs):
          databases = kwargs.get("databases") or [
 }}}

-- 
Ticket URL: <https://code.djangoproject.com/ticket/34861#comment:1>
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