python - SQLAlchemy DetachedInstanceError with regular attribute (not a relation) -

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I have just started using SQLite and have received a separate instant error and can not find much information on this. Has pie. I am using an example out of a session, so it is natural that if SQLAlchemy is unable to load any relationship, if it is not loaded already, however, the entry I am entering is not related There is no connection to this object in fact. I was getting a solution like eager loading, but I can not apply it because it is not a relation. I tried to "touch" this feature before closing the session, but it still does not stop the exception. What can be the reason for this exception of non-relational property, even then it can be reached successfully once before? Any help in debugging this issue is appreciated. Meanwhile, I try to get a reputable stand-alone scenario and update it here.

Update: This is the actual exception message with some heaps: 

  file "/ home /hari/bin/lib/python2.6/site-packages/SQLAlchemy- 0.6.1-py2.6.egg / sqlalchemy / orm / attributes.py ", line 159, __get__ return to self.impl.get (instance_state (example), instance_dict (example)) file" / home / hari / bin / Lib / python2.6 / site-packages / SQLAlchemy-0.6.1-py2.6.egg / sqlalchemy / orm / attributes.py ", line 377, received value = callable_ (idle = inactive) file" / home / hari / Bin / lib / python2.6 / site-packages / SQLAlchemy-0.6.1-py2.6.egg / sqlalchemy / orm / state.py ", line 280, __call__ in self.manager.deferred_scalar_loader (self, toload) the file" /home/hari/bin/lib/python2.6/site-packages/SQLAlchemy-0.6.1-py2.6.egg/sqlalchemy/orm/mapper.py " , Line 2323, _load_scalar_attributes (in state_str (state)) Separate instant error: Example & lt; ReportingJob & gt; 0xa41cd8c Is not bound for a session;  
  metadata = metadata () ModelBase = declarative_base (metadata = metadata) class ReportingJob (ModelBase: attribute refresh operation  
 
 partial model looks like this Can be increased): __tablename__ = 'reporting_job' job_id = column (BigInteger, sequence ('job_id_sequence'), primary_key = true) client_id = column (BigInteger, tap = true)

and area client_id

Question: What is causing this exception with the use of one of the following: 

  jobs = session \ .query (ReportingJob) \ .filter (ReportingJob .job_id == job_id) \. All () Job: #Fixem (Hari): Optional solution for lazy loading feature. Jobs [0] .client_id return jobs [0]

Session scope later triggers exception: 

  msg = msg + ", Client_id:% s "% job.client_id

I found the original reason when trying After the session was closed to reduce the cause of the code, I placed the same attribute access code at different places and found that this query is not the cause of any issue immediately after the session is closed. It turns out that the problem starts after the closure of the fresh session, which is opened to update the object. Once I understood that the position of the object was unusable after a session was closed, then I was able to find it, which was discussed on this issue. There are two solutions to exit the thread:

  • Open the session (which is clear)
  • Specify expire_on_commit = false to session Manager () .

The session is to manually set expire_on_commit to incorrect , something like this: session.expire_on_commit = False . I've verified that this resolves my problem.


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