cubicweb-container #4197406 utility function to find out what is not in a container [rejected]

Part of the setup for container involves checking its structure and content. When the container actually contains most of the entity types defined in a schema, this can be quite tedious and I would find it quite useful to have a utility function to check what is not in the container rather than checking what is inside (as does container_rtypes_etypes).

prioritynormal
typeenhancement
done in2.7.0
load0.000
load left0.000
closed by#9736287fcade Add a function to compute the entity and relation types outside a container
patchAdd a function to compute the entity and relation types outside a container [applied]