#30445: RunSQL Migration should accept psycogp2 sql.Composable object
-------------------------------------+-------------------------------------
Reporter: | Owner: nobody
suomenusko |
Type: New | Status: new
feature |
Component: | Version: 2.2
Migrations | Keywords: RunSQL
Severity: Normal | sql.Composable
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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Generally, if we want to run raw SQL in the code, you do it the context of
a cursor. If you have psycopg2 as your DB backend, in addition to passing
cursor.execute a string, you can also pass an sql.Composable object, and
it'll work.
However, if you are doing a RunSQL migration, you cannot use these, since
the BaseDatabaseSchemaEditor execute method assumes it is a string (?).
Specifically, it tries to explicitly casts it to a string, before passing
sql to the cursor's execute. It seems like the line is there to account
for non string objects, but str() won't convert Composable objects to the
SQL statement correctly.
I'm not sure how reasonable it is to fix this, especially since I'm not
too sure what collect_sql should be doing (it looks like sql being a
string is pretty ingrained in the logic), and it's easy enough to fix this
yourself by subclassing RunSQL, and calling the Composable's as_string
method, but it seems like the schema editor's execute method should be
agnostic towards the type you pass in, since all it really does is call
the cursor's execute. With that said, I think it's fair to say this is
more of a new feature than a bug.
--
Ticket URL: <https://code.djangoproject.com/ticket/30445>
Django <https://code.djangoproject.com/>
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