strong parameters permit all attributes for nested attributes

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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.

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