Greetings, I just started using py4web, and I'm very excited to do so.
Has there been any more thought on this issue? I was partially into a new web2py app in which I use _enable_record_versioning(), and I am migrating it to py4web. Thanks. On Saturday, August 17, 2019 at 10:34:21 PM UTC-7, Massimo Di Pierro wrote: > > Sorry for the late response. I just run into this myself. Do not have a > good solution at this time, unless we make pydal aware of > ThreadSafeVariable(s). Maybe we have to. > > On Wednesday, 31 July 2019 05:05:50 UTC-7, Manuel Vio wrote: >> >> Ok, I narrowed the problem a bit: >> >> In py4web/core.py, around line 207, there is this adjustment in order to >> make some variables threadsafe: >> >> # make sure some variables in pydal are thread safe >> for _ in ['readable', 'writable', 'default', 'update', 'requires']: >> setattr(pydal.DAL.Field, _, threadsafevariable.ThreadSafeVariable()) >> >> Turns out that PyDAL's _enable_record_versioning(), in order to create >> the archive table, clones all original fields with their properties. Or, at >> least, it tries to: it seems that copy() fails to correctly transfer >> threadsafevariable informations when dealing with those variables. >> I guess that when cloned field's requires attribute is accessed those >> information are not valid anymore and py4web throws the aforementioned >> exception. >> I was able to circumvent this error adding an explicit copy of the >> attribute in pydal, but still I'm not sure if this could eventually lead to >> thread problems: >> >> for field in self: >> nfk = same_db or not field.type.startswith('reference') >> clone = field.clone(unique=False, type=field.type if nfk else 'bigint') >> clone.requires = copy.copy(field.requires) >> clones.append( >> clone >> ) >> >> >> Any thougths? >> > -- 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) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/web2py/83623a73-8a71-4523-8cbb-79ec3cea70f9%40googlegroups.com.