Django reverse to contains/icontains

Question

In this question was solved problem for reverse LIKE operation in SQL, for example if field name is \"Peter Johnson\", we could find it by such query:

Answer 1

Unfortunately, Django's ORM doesn't have anything built-in for reverse LIKEs. But an .extra() clause may make it a bit easier than a raw query.

I used something like this:

qs.extra(
    where=['''%s LIKE %s.%s'''],
    params=(
        "string to match",
        FooModel._meta.db_table,
        "bar_field",
    ),
)

The problems with the code above are that

1) it doesn't work with sqlite backend in this form ("syntax error near .", it does work with table/column names hardcoded in query... which is not always safe and always ugly);

and 2) it requires FooModel.bar_field to have data %in like style% so you can't match arbitrary strings (this can be fixed with a query like %s LIKE CONCAT("%", %s.%s, "%") but it'll make it DBMS-specific, which is not good).

Reversed LIKE itself should probably work with any major DBMS, but I tested it only on sqlite and postgres.

Maybe someone should generalize my solution and create a reusable, DBMS-agnostic app with special subclassed queryset/manager/Q-object for this specific task...