sniipe wrote:
>
> Hi :)
>
> I have three tables:
>
> 1)
> t_version = sa.Table("versions", meta.metadata,
> sa.Column("id", sa.types.Integer(), primary_key=True,
> autoincrement=True),
> sa.Column("version", mysql.MSChar(length=100,
> collation='utf8_polish_ci'), nullable=False, unique=True)
> )
>
> class Version(object):
> pass
>
> orm.mapper(Version, t_version)
>
> 2)
> t_type = sa.Table("types",
> meta.metadata,
> sa.Column("id", sa.types.Integer(), primary_key=True,
> autoincrement=True),
> sa.Column("name", mysql.MSChar(length=100,
> collation='utf8_polish_ci'), nullable=False, unique=True),
> )
>
> class Type(object):
> pass
>
> orm.mapper(Type, t_type, properties = {
> 'engine' : orm.relation(Engine, uselist=False,
> backref='Type_Engine')
> })
>
> 3)
> t_engine = sa.Table("engines", meta.metadata,
> sa.Column("id", sa.types.Integer(), primary_key=True,
> autoincrement=True),
> sa.Column("min_version_id", sa.types.Integer(), sa.ForeignKey
> ("versions.id"), nullable=False),
> sa.Column("max_version_id", sa.types.Integer(), sa.ForeignKey
> ("versions.id"), nullable=False),
> sa.Column("type_id", sa.types.Integer(), sa.ForeignKey
> ("types.id"), nullable=False),
> )
>
> class Engine(object):
> pass
>
> orm.mapper(Engine, t_engine, properties = {
> 'type' : orm.relation(Type, uselist=False, backref='Engine_Type'),
> 'min_version' : orm.relation(Version,
> primaryjoin=t_engine.c.min_version_id==t_version.c.id),
> 'max_version' : orm.relation(Version,
> primaryjoin=t_engine.c.max_version_id==t_version.c.id)
> })
>
> My problem is how to make query equal this SQL instruction "select
> e.id, e.type_id, tv.version as min_version, tv2.version as max_version
> from engines e join versions tv on(e.min_version_id=tv.id) join
> versions tv2 on(e.max_version_id=tv2.id) where '7.0.1.32' between
> tv.version and tv2.version;"
>
> I've tried to do something like that:
>
> engine = meta.Session.query(Engine).outerjoin(Version).filter(between
> (request.POST['version'], Engine.min_version.version,
> Engine.max_version.version)).all()
when you do the outerjoin, pass it the relation you're joining on or an
onclause, such as
query.outerjoin(Version.engine)
or
query.outerjoin((Version, Engine.some_col==Version.some_other_col))
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