Delete propagation

[DannyBen]

I was under the assumptions that deleting a parent object, deletes any object that references it.
The README only mentions this propagation in the track section.

I was expecting the below test to work - am I doing something wrong, or do I need to delete the orphan objects manually?

require 'ohm'

class Parent < Ohm::Model
  attribute :name
  collection :children, :Child
end

class Child < Ohm::Model
  attribute :name
  reference :parent, :Parent
end

system 'redis-cli flushall'  # WARNING
parent = Parent.create name: 'Robert'
child = Child.create parent: parent, name: 'Kim'

parent.delete

p Parent[1].name rescue 'Parent is gone (PASS)'
p Child[1].name rescue 'Child is gone (PASS)'
p Child[1].parent

p Parent.all.count
p Child.all.count

[scalp42]

@DannyBen any updates by any chance? Curious how you ended working around this? Thanks in advance for sharing.

[DannyBen]

I don;t recall. Looking at my code I see nothing that handles this other than a function that deletes orphan objects...

[soveran]

Maybe we can use Ohm::Callbacks.

By defining a before_delete callback, we can remove all the children:

class Parent < Ohm::Model
  include Ohm::Callbacks

  attribute :name
  collection :children, :Child

  def before_delete
    children.each do |child|
      child.delete
    end
  end
end

[scalp42]

Ah very neat, merci @soveran!