[FIX] model: wrong alias used in read query for multi-inherited field

In commit 04ba0e99, we introduced an optimization for reading inherited fields
in a single query.  There is an issue when you have more than one level of
`_inherits`.  The query looks like:

    SELECT ...
    FROM table0, table1 AS alias1, table2 AS alias2
    WHERE table0.link0 = alias1.id AND table1.link1 = alias2.id AND ...
                                       ^^^^^^
                             should be alias1

This fixes the issue, and adds a test to reproduce it.  The fix is based on
@emiprotechnologies's own proposal, but is cleaner and does not break APIs.

0 files changed, 0 insertions, 0 deletions