[ZODB-Dev] understanding _p_resolveConflict

[Stefan H. Holek]

<http://mail.zope.org/pipermail/zodb-dev/2003-October/006133.html>

Note that it is not about selecting one of the states to return, but 
about actually computing a new state (e.g. by merging savedState and 
newState).

Stefan


On Mittwoch, Aug 4, 2004, at 08:19 Europe/Vienna, Bakhtiar A Hamid 
wrote:
> say i have
> class myclass:
>     def __init__(self,var1='',var2=[]):
>          self.var1=var1
>          self.var2 = var2
>
>     def _p_resolveConflict(self,oldstate,savedstate,newstate):
>         return newstate
>
> the code seems to work since i no longer got massive ConflictError.  
> now
> there's some ReadConflictError (which is ok, i guess)
>
> my understanding/questions:
> -oldstate, savedstate and newstate are dicts.  it's not REQUESTS
> -what do we need to compare/merge?  say i'm interested with var2. and 
> do
> something like this:
>
>     def _p_resolveConflict(self,oldstate,savedstate,newstate):
>         import difflib
>         #difflib.unified_diff(savedstate['var1'],newstate['var1'])
>         #if no diff, use oldstate
>         #else use newstate
>         return xxx  #where xxx is what?
> -what do i return?  the state i want?
>

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