This is for the actual Schema branch (Sa 0.2 rev. 1468).
Using polymorphism as it is shown in the examples
creates a SQL query like this :
SELECT pjoin.info AS pjoin_info,
pjoin.parent_id AS pjoin_parent_id,
pjoin.type AS pjoin_type,
pjoin.id AS pjoin_id
FROM (
SELECT info.info AS info,
contained.parent_id AS parent_id,
contained.type AS type,
info.id AS id
FROM contained JOIN info ON contained.id = info.id
UNION ALL
SELECT NULL AS info,
parent_id,
type,
id
FROM (
SELECT contained.id AS id,
contained.parent_id AS parent_id,
contained.type AS type
FROM contained
WHERE contained.type = "contained"
)
) AS pjoin
ORDER BY pjoin.id
Everything works fine with SQLite.
With MySQL this produces :
SQLError: (OperationalError) (1248, 'Every derived table must have its own
alias')
Using an alias in the select of the UNION ALL solves the problem :
SELECT pjoin.info AS pjoin_info,
pjoin.parent_id AS pjoin_parent_id,
pjoin.type AS pjoin_type,
pjoin.id AS pjoin_id
FROM (
SELECT info.info AS info,
contained.parent_id AS parent_id,
contained.type AS type,
info.id AS id
FROM contained JOIN info ON contained.id = info.id
UNION ALL
SELECT NULL AS info,
pjoin_1.parent_id,
pjoin_1.type,
pjoin_1.id
FROM (
SELECT contained.id AS id,
contained.parent_id AS parent_id,
contained.type AS type
FROM contained
WHERE contained.type = "contained"
) as pjoin_1 <----------------------------
) AS pjoin
ORDER BY pjoin.id
Jürgen
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