[ZODB-Dev] Writing Persistent Class

[Jim Fulton]

I don't have time to offer specific suggestions or help, other than to  
say that while persistence classes are powerful, these are wildly  
advanced.  I steer clear of them myself.

Jim


On Jan 17, 2008, at 8:08 PM, Kenneth Miller wrote:

> All,
>
>     Quick question.
>
>     I'm trying to make one of my classes persistent. The class  
> itself has only simple attributes of general types like  
> int,string,timestamp, no lists etc. It seems to work just fine  
> without subclassing Persistent, but causes an error when I do. Do I  
> always need to subclass persistent?
>
> There error i receive seems to have a problem with my __eq__ method.
>
> Here's the error I get when I do subclass persistent:
>
> .......No handlers could be found for logger "ZODB.Connection"
> E
> ======================================================================
> ERROR: testPersistence (__main__.ToolDataTests)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>  File "Objects.py", line 1412, in testPersistence
>    self.failUnlessEqual(readFromFS(),td)
>  File "/System/Library/Frameworks/Python.framework/Versions/2.5/lib/ 
> python2.5/unittest.py", line 332, in failUnlessEqual
>    if not first == second:
>  File "Objects.py", line 1278, in __eq__
> 	!!!!Below is where it's choking on my __eq__ method!!!
>    return self.name == other.name and self.value == other.value and  
> mx 
> .DateTime.cmp(self.timeStamp,other.timeStamp,Globals.AvgTimePrec)==0  
> and self.slowData == other.slowData
>  File "/Library/Python/2.5/site-packages/ZODB3-3.7.2-py2.5- 
> macosx-10.5-i386.egg/ZODB/Connection.py", line 758, in setstate
>    raise ConnectionStateError(msg)
> ConnectionStateError: Shouldn't load state for 0x01 when the  
> connection is closed
>
> ----------------------------------------------------------------------
> Ran 8 tests in 0.043s
>
> FAILED (errors=1)
>
> Thanks for the help!
>
> Regards,
> Kenneth Miller
>
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--
Jim Fulton
Zope Corporation