Rails - Dec 2013 - Rails, accepts_nested_attributes_for has_many: through with build

I have 3 models:

class Product < ActiveRecord::Base
   has_many :product_option_types
   has_many :option_types, through: :product_option_typesend
class OptionType < ActiveRecord::Base
    has_many :product_option_types
    has_many :products, through: :product_option_typesend
class ProductOptionType < ActiveRecord::Base
    belongs_to :product
    belongs_to :option_typeend

Table OptionType is predefined with following:

[image: enter image description here]

Now when creating new Product i need to populate also table 
product_option_types with product_id and option_type id: Here is the design 
of product_option_types table:

[image: enter image description here]

Far as i know i need accepts_nested_attributes_for in Product model to 
refference product_option_types, so in product model i need following *?*

accepts_nested_attributes_for :product_option_types, allow_destroy: true

Before rendering new.html.erb then i need to build product_option_types on 
the following way *?*

@product =
Product.new-vsVTqSbophf5vxNyLA01Fg@public.gmane.org_option_types.build(position:
1)

In the view new.html.erb i'm using collection_select to display 
option_types:

<%= f.fields_for :product_option_types do |builder| %>
    <%= builder.label :option_type_id, "Options" %>
    <%= builder.collection_select :option_type_id, OptionType.all(order:
'name ASC'),
                                  :id, :name, { prompt: "Select
option..."} %><% end %>

Finally in the crate action of product controller i must permit also 
association attributes like:

permited = params[:product].permit(product_option_types_attributes: 
[:option_type_id])

*So main question is, did i set up accepts_nested_attributes_for, build, 
collection_select and associations correctly?*

+: When im building associoation with parameters like:

@product.product_option_types.build(position: 1)

*Then to pass that information(position: 1) to create action i must use 
hidden_field in form?*

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