cubicweb-container #2517014 provide helper for migrations [resolved]

as people fizzle with their containers, they currently must not forget to manually handle the appropriate container_parent, <container_rtype> relation definitions

we should at least provide checkers & helpers to automate this

prioritynormal
typeenhancement
done in2.1.0
load1.000
load left0.000
closed by#7a4527622068 [utils] provide a helper for container_parent maintenance in migrations (closes #2517014)
patch[utils] provide a helper for container_parent maintenance in migrations (closes #2517014) [applied]