How to access nested params

Question

I would like to get some nested params. I have an Order that has many Items and these Items each have a Type. i would like to get the type_id parameter from the controllers

Answer 1

To access the nested fields from params do the following:

params[:order][:items_attributes].values.each do |item|
  item[:type_id]
end if params[:order] and params[:order][:items_attributes]

Above solution will work ONLY if you have declared the correct associations and accepts_nested_attributes_for.

class Order < ActiveRecord::Base
  has_many :items
  accepts_nested_attributes_for :items, :allow_destroy => true
end

class Item < ActiveRecord::Base
  belongs_to :order
end