Ruby on Rails

Hello Experts,
I have a tree of categories in this category object there is a property
called type.
the root categories have no type but the children have. so how I can get
all the roots with filled in children that have category type = 'B' for
instance.
I tried to run Category.roots then delete children With a category not
equal to 'B' but this causes a major performance problems.

how to call roots with filter children?


best regards
Ibrahim

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