How can I revert to a fallback in a Rails has_many dependent: :destroy scenario?-CodePudding

Imagine a scenario where I have a model that has categories. The model belongs_to a category, and the category has_many models. The has_many relationship has a dependent: :destroy condition.

However I have a default category (essentially "not specified") that I would like to use as a fall back. So imagine category 1 is deleted - what should happen is that all the records of the model that were associated with category 1 should automatically be assigned to "not specified".

Any hints into the right direction appreciated.

CodePudding user response：

What you saying is that you don't want to destroy dependent models:

class Category < ApplicationRecord
  has_many :models #,dependent: :destroy

  before_destroy do
    models.update_all(category_id: Category.first.id) # fallback to default category
  end
end