Hi John:
The following import is causing that error.
from sqlalchemy.orm import session, Session
In the all-in-one example you provided, you later go on to reassign
'session' and 'Session', replacing those imported values with your own
values.
Session = scoped_session(sessionmaker(bind=engine)) session = Session()
In the two-file version, restresource.py isn't getting the 'Session'
you created in two_file_server.py, but rather a new blank one from the
import statement.
Hope that helps,
--diana
On Thu, Dec 8, 2011 at 8:41 PM, John Hufnagle <johnjhufna...@gmail.com> wrote:
> Thanks Michael,
>
> Could not find a hidden Session object.
> So I broke it down into a problem that works/doesn't work based on
> files separation
>
> 1. If I place all of the code into one file all_in_one.py which
> contains the cherrypy startup, the SA init code and ORM object and the
> cherrypy REST resource then it works when trying to use a session
> during request handling
>
> 2. If I divide up the code into 2 files...the cherrypy startup code &
> SA init code in one file and then the REST class, and the ORM class in
> the other then it fails when trying to use a session during request
> handling.
>
> In both cases the code is 'essentially' the same.
> I'm sure I'm missing a python based problem...I'm new to it as well as
> SA.
> ------------------------------------
> Working single file case all_in_one.py
>
> import cherrypy
> from sqlalchemy import *
> import MySQLdb
> from sqlalchemy.orm import session, Session, scoped_session,
> sessionmaker
> from sqlalchemy.ext.declarative import declarative_base
> from sqlalchemy.dialects.mysql import MEDIUMTEXT
> from sqlalchemy import Column, Integer, String, DateTime, func
>
>
> engine = create_engine('mysql://xxxx:xxxxx@localhost/test', echo=True)
> meta = MetaData()
> Session = scoped_session(sessionmaker(bind=engine))
>
> class RESTResource(object):
> orm_class = None
>
> def __init__(self, ormcls):
> self.orm_class = ormcls
>
> @cherrypy.expose
> def default(self, *vpath, **params):
> method = getattr(self, "handle_" + cherrypy.request.method,
> None)
> if not method:
> methods = [x.replace("handle_", "")
> for x in dir(self) if x.startswith("handle_")]
> cherrypy.response.headers["Allow"] = ",".join(methods)
> raise cherrypy.HTTPError(405, "Method not implemented.")
> return method(*vpath, **params);
>
> def handle_GET(self, *vpath, **params):
> try:
> session = Session()
> session.query(ProjectORM).filter(ProjectORM.id ==
> 12).one()
> except:
> print "got exception!!!!!"
> raise
> print "all ok!"
> return "done GET"
>
> def handle_PUT(self, *vpath, **params):
> return "done PUT"
>
>
> Base = declarative_base()
> class ProjectORM(Base):
> __tablename__ = 'project'
>
> id = Column(Integer, primary_key=True)
> name = Column(String(256))
> about = Column(String(1024))
> url = Column(String(512))
> version = Column(Integer)
> mbd_metadata = Column('metadata',MEDIUMTEXT)
> creation = Column(DateTime)
>
> def __init__(self, name, about, url, version, mbd_metadata):
> self.name = name
> self.about = about
> self.url = url
> self.version = version
> self.mbd_metadata = mbd_metadata
> self.creation = func.now()
>
> def __repr__(self):
> return "<User('%s','%s', '%s')>" % (self.name, self.about,
> self.url, self.version, self.mbd_metadata, self.creation)
>
>
> class Root(object):
> project = RESTResource(ProjectORM)
>
> @cherrypy.expose
> def index(self):
> return "JBPC VAMPS REST Service"
>
> cherrypy.quickstart(Root())
>
>
> -----------------------------------------
> -----------------------------------------
> Failing two file case
> first file
> two_file_server.py as follows:
>
>
> import cherrypy
> from sqlalchemy import *
> import MySQLdb
> from sqlalchemy.orm import session, Session, scoped_session,
> sessionmaker
> from sqlalchemy.ext.declarative import declarative_base
> from sqlalchemy.dialects.mysql import MEDIUMTEXT
> from restresource import *
>
> engine = create_engine('mysql://xxxx:xxxxx@localhost/test', echo=True)
> meta = MetaData()
> Session = scoped_session(sessionmaker(bind=engine))
>
> class Root(object):
> project = RESTResource(ProjectORM)
>
> @cherrypy.expose
> def index(self):
> return "JBPC VAMPS REST Service"
>
> cherrypy.quickstart(Root())
>
>
> -----------------------------------------
> -----------------------------------------
>
> the second file of the two file set:
> restresource.py
>
>
> import cherrypy
> from sqlalchemy import *
> import MySQLdb
> from sqlalchemy.orm import session, Session, scoped_session,
> sessionmaker
> from sqlalchemy.ext.declarative import declarative_base
> from sqlalchemy.dialects.mysql import MEDIUMTEXT
> from sqlalchemy import Column, Integer, String, DateTime, func
>
> Base = declarative_base()
> class ProjectORM(Base):
> __tablename__ = 'project'
>
> id = Column(Integer, primary_key=True)
> name = Column(String(256))
> about = Column(String(1024))
> url = Column(String(512))
> version = Column(Integer)
> mbd_metadata = Column('metadata',MEDIUMTEXT)
> creation = Column(DateTime)
>
> def __init__(self, name, about, url, version, mbd_metadata):
> self.name = name
> self.about = about
> self.url = url
> self.version = version
> self.mbd_metadata = mbd_metadata
> self.creation = func.now()
>
> def get_one(self):
> pass
>
> def __repr__(self):
> return "<User('%s','%s', '%s')>" % (self.name, self.about,
> self.url, self.version, self.mbd_metadata, self.creation)
>
>
> class RESTResource(object):
> orm_class = None
>
> def __init__(self, ormcls):
> self.orm_class = ormcls
>
> @cherrypy.expose
> def default(self, *vpath, **params):
> method = getattr(self, "handle_" + cherrypy.request.method,
> None)
> if not method:
> methods = [x.replace("handle_", "")
> for x in dir(self) if x.startswith("handle_")]
> cherrypy.response.headers["Allow"] = ",".join(methods)
> raise cherrypy.HTTPError(405, "Method not implemented.")
> return method(*vpath, **params);
>
> def handle_GET(self, *vpath, **params):
> try:
> session = Session()
> session.query(ProjectORM).filter(ProjectORM.id ==
> 12).one()
> except:
> print "got exception!!!!!"
> raise
> print "all ok!"
> return "done GET"
>
> def handle_PUT(self, *vpath, **params):
> return "done PUT"
>
> def get_all_or_one(self,vpath):
> if len(vpath) == 0:
> all = self.orm_class.get_all()
> else:
> one = self.orm_class.get_instance(vpath[0])
> k = 1
>
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