There are an exclusive list for Pydal? If yes, apologize me.

I'm experiencing a trouble with mongodb and pydal/web2py. I'm trying to
perform the query below, but it simply doesn't work, "silently". Only in
the terminal a message appear:

WARNING:pyDAL:select attribute not implemented: left

The query is:

    mywhere = ((db.esc.date>=ini)&(db.esc.date<=end))
    myleft = [db.reg.on(db.esc.vei == db.reg.pre)]
    rows = db(mywhere).select(db.esc.date,
                        db.esc.vei,
                        db.esc.rot,
                        db.esc.con,
                        db.reg.tim,
                        db.reg.eve,
                        db.reg.atu,
                        db.reg.rpm,
                        db.reg.kmh,
                        left = myleft
                        )

In time, what is the way that web2py implement referenced fields in
mongodb? Is dbref?

Best regards,

-- 
José Ricardo Borba

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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