ruby on rails - strong parameters permit all attributes for nested attributes

Question

Is there a way in strong parameters to permit all attributes of a nested_attributes model? Here is a sample code.

class Lever < ActiveRecord::Base
 has_one :lever_benefit
 accepts_nested_attributes_for :lever_benefit
end

class LeverBenefit < ActiveRecord::Base
  # == Schema Information
  #  id          :integer          not null, primary key
  #  lever_id    :integer
  #  explanation :text
end

For lever strong parameters i am writing currently this

def lever
 params.require(:lever).permit(:name,:lever_benefit_attributes => [:lever_id, :explanation])
end

Is there a way for nested attributes i can write to permit all attributes without explicitly giving the attributes name like lever_id and explanation ?

Note: Please don't get confused with this question with permit! or permit(:all) this is for permitting all for nested attributes

Answer 1

The only situation I have encountered where permitting arbitrary keys in a nested params hash seems reasonable to me is when writing to a serialized column. I've managed to handle it like this:

class Post
  serialize :options, JSON
end

class PostsController < ApplicationController
  ...

  def post_params
    all_options = params.require(:post)[:options].try(:permit!)
    params.require(:post).permit(:title).merge(:options => all_options)
  end
end

try makes sure we do not require the presents of an :options key.