Source of spikes from multicomp cell is ~random segment if none named 'soma'

[pgleeson]

This code in associateGid() for placing a NetConn which will be the source of spikes for that cell's gid:

 sec = self.secs['soma'] if 'soma' in self.secs else self.secs[self.secs.keys()[0]] # use soma if exists, otherwise 1st section

will try to select the 'first' section if there is none called 'soma'. However there is no guarantee that the key returned by self.secs.keys()[0] will be for the root section, it depends how the cell was created and how the list ordering is handled.

It might be better to look through self.secs to find the section which has no parent (topol = {}) and use this:

 for s in self.secs:
     if len(self.secs[s]['topol'])==0: # i.e. no parent 
          sec = self.secs[s]

Thoughts @salvadord?

[salvadord]

yes! thats a great idea, thanks, I'll modify

[pgleeson]

Thanks.

cc @andrisecker