I am using an adjacency list to store file system paths.
--
class Path(sqlobject.SQLObject):
parent = sqlobject.ForeignKey('SyncPath', cascade=True)
path = sqlobject.StringCol(alternateID=True)
--
I would like to retrieve an object given it's path in one fell swoop.
Below is an example...
path: /home/btimby/somefile
sql:
select p2.*
from path as p0
left join path as p1
on p1.parent_id = p0.id
and p0.path = 'home'
left join path as p2
on p2.parent_id = p1.id
and p1.path = 'btimby'
and p2.path = 'somefile';
How could I accomplish this in SQLObject? I would have code similar to
the following, but not sure how to generate the aliases and multiple
levels of joins...
--
def get_path(path):
path_parts = path.split(os.sep)
sql = Path
for part in path_parts:
sql = Path.select(sqlbuilder.LEFTJOINOn(
sql,
Path,
sqlbuilder.AND(
Path.q.id == Path.q.parent,
Path.q.path == part
)
))
print sql
--
The above is a bit naive, but hopefully the solution is possible.
Thanks.
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