In my pyramid app, a celery task was giving me: "Task
lr.queue.tasks.fetch_bmark_content[b667d64c-5505-408c-bd12-f9a1863b2e7c]
raised unexpected: UnboundExecutionError('Could not locate a bind
configured on mapper Mapper|Bmark|bmarks, SQL expression or this Session',)"
from reading around it appears that the engine is not bound to the Session.
So I guess I have to initialize the Session in my tasks.py file also. I
have a method in my models.__init__.py file called initialize_sql which
does this, but it is only called from the main entry point of the pyramid
app. So I do this in tasks.py(added line with '# +'):
from lr.models import initialize_sql
from .celery import load_ini
INI = load_ini()
initialize_sql(INI) # +
def initialize_sql(settings):
"""Called by the app on startup to setup bindings to the DB"""
engine = engine_from_config(settings, 'sqlalchemy.')
DBSession.configure(bind=engine)
Base.metadata.bind = engine
from lr.models.auth import User
if not hasattr(Bmark, 'user'):
Bmark.user = relation(User, backref="bmark")
When I run the app, it initializes from the main entry point fine, but when
I open a page that requires any sort of db access, I get:
OperationalError: (OperationalError) unable to open database file None None
I simply do not get this, why would calling initialize_sql() in an
unrelated context cause an issue? I feel stuck, if I 'fix' one thing it
breaks another. Any suggestions?
first celery stack trace: http://pastebin.com/4P1bL4xw
stacktrace: http://pastebin.com/UJrF2W5G
tasks.py: http://pastebin.com/2jC7Hs8x
celery.py: http://pastebin.com/JbAehA2Q
main __init__.py: http://pastebin.com/mbkYy6Wu
Michael
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