What happens when the type string in the DB does not correspond to any Python Class

[aiida-bot]

Originally reported by: Giovanni Pizzi (Bitbucket: pizzi, GitHub: giovannipizzi)

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Right now, the base Node class is returned.
First, we need to discuss if this is ok.
In particular, it may be good maybe to return the 'closest' existing class. A specific issue I have is:

verdi calculation list -p20 -a

05/30/2016 06:19:16 PM, aiida: [ERROR] Unable to find plugin for type 'calculation.job.phonopy.PhonopyCalculation.' (node= 222733), will use base Node class
05/30/2016 06:19:16 PM, aiida: [ERROR] Unable to find plugin for type 'calculation.job.phonopy.PhonopyCalculation.' (node= 222752), will use base Node class
05/30/2016 06:19:16 PM, aiida: [ERROR] Unable to find plugin for type 'calculation.job.phonopy.PhonopyCalculation.' (node= 222773), will use base Node class
05/30/2016 06:19:16 PM, aiida: [ERROR] Unable to find plugin for type 'calculation.job.phonopy.PhonopyCalculation.' (node= 222794), will use base Node class
05/30/2016 06:19:16 PM, aiida: [ERROR] Unable to find plugin for type 'calculation.job.phonopy.PhonopyCalculation.' (node= 222817), will use base Node class
Error (AttributeError): 'Node' object has no attribute '_get_state_string'

Specifically, I don't have the plugin in this branch, a bare "Node" is returned, this does not have the _get_state_string, and therefore I do not see any calculation in the output (not even the other ones). One simple workaround is to fix the 'verdi calculation list' function, but it would be more robust to return in this case e.g. a JobCalculation.

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• Bitbucket: https://bitbucket.org/aiida_team/aiida_core/issue/215

[giovannipizzi]

@DropD This is to be taken into account for the new plugin system as we discussed

[sphuber]

This was solved by the safe plugin loader that will fall back on the closest class instead of base Node class. See PR #1185