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Editorial Team
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Asked: 2026-06-11T01:00:54+00:00

I have a simple hierarchy that I’m trying to build. class Category < ActiveRecord::Base

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I have a simple hierarchy that I’m trying to build.

class Category < ActiveRecord::Base
  attr_accessible :name

  belongs_to :parent, class_name: "Category"
  has_many :children, class_name: "Category", foreign_key: :parent_id
end

I can add categories to a tree and it works fine. However, things do not work as expected when deleting. For example:

root = Category.new(:name => "Root")
child = Category.new(:name => "Child")
child.parent = root
# things are fine to this point. root.children contains child,
# and child.parent is root

root.children.delete child
# at this point root.children is empty, but child.parent is still root

Any ideas what might be happening here? Thanks!

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1 Answer

  1. Editorial Team

    Answer: it’s product.reload

    This explanation is the first one I’ve found after hours searching:
    https://stackoverflow.com/a/7449957/456280

    (Also this is directly related to my question here: Delete in Many to Many Relationship Not Symmetric? )

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