Rails 5 Has Many Through with Nested Form and Cocoon - ruby-on-rails

Question

Solverd: see bottom
I am building a ordering system of many products, with a HBTM from Join Table to anotherModel, but I have some problems when creating and editing a new record of a nested form.
I have tried many solutions from other questions and followed some tutorial like this or this, but nothing solved my issues.
Product Model:
class Product < ApplicationRecord
belongs_to :subcategory
has_many :order_products, inverse_of: :product
has_many :order, :through => :order_products
end
Order Model:
class Order < ApplicationRecord
has_many :order_products, inverse_of: :order
has_many :products, :through => :order_products
accepts_nested_attributes_for :products, reject_if: :all_blank, allow_destroy: true
end
Join Table:
class OrderProduct < ApplicationRecord
belongs_to :order
belongs_to :product
has_and_belongs_to_many :ingredients
accepts_nested_attributes_for :ingredients, reject_if: :all_blank, allow_destroy: true
end
Ingredients Model associated with join table: (many-to-many to save added ingredients to every products on the order)
class Ingredient < ApplicationRecord
has_and_belongs_to_many :order_products
end
Order Controller:
# GET /orders/new
def new
#order = Order.new
end
# GET /orders/1/edit
def edit
end
# POST /orders
# POST /orders.json
def create
#order = Order.new(order_params)
respond_to do |format|
if #order.save
format.html { redirect_to #order, notice: 'Order was successfully created.' }
format.json { render :show, status: :created, location: #order }
else
format.html { render :new }
format.json { render json: #order.errors, status: :unprocessable_entity }
end
end
end
def order_params
params.require(:order).permit(:subtotal, :discount, :total,
order_products_attributes: [[:id, :order_id, :product_id , :_destroy]])
end
Views:
<%= simple_form_for(#order) do |f| %>
<%= f.error_notification %>
<div class="form-inputs">
<%= f.input :subtotal %>
<%= f.input :discount %>
<%= f.input :total %>
</div>
<%= f.simple_fields_for :order_products do |o| %>
<%= render 'order_product_fields', f: o %>
<% end %>
<%= link_to_add_association "aggiungi prodotto", f, :order_products %>
<div class="form-actions">
<%= f.button :submit %>
</div>
<% end %>
Partial: (unable to add cocoon's destroy link: undefined method `reflect_on_association' for NilClass:Class due to auto add of blank fields)
<div class="nested-fields order-product-fields">
<%= f.input :product %>
<%= f.input :order %>
<%= f.check_box :_destroy %>
</div>
I get this on console:
Parameters: {"utf8"=>"✓", "authenticity_token"=>"PRNzrnxk/jrsAyPK5OzFxix2hIUmjCeWpD8Fkuhuhx8Wp3/xYTbTTvsfQkhnMDEBNnC/iNL46kl68XR7skb03g==", "order"=>{"subtotal"=>"", "discount"=>"", "total"=>"", "order_products"=>{"product"=>"", "order"=>"", "_destroy"=>"0"}}, "commit"=>"Create Order"}
Unpermitted parameter: order_products
My throubles are: EDIT: Solution on each point
When I load order pages, blanks fields for nested attributes are automatically created ()
Was wrong nested_attributes on Order Model:
accepts_nested_attributes_for **:order_products**, reject_if: :all_blank, allow_destroy: true
When submitting form no entry are created. (but I can add product to order via console .ex: order.products << product1)
When I add more product via cocoon's add link, only first is sent to controller
Don't know how to implements Strong Parameters and views for Ingredient's attributes inside the form of Order
Got this working:
Ingredient model:
has_many :ingredient_order_products, inverse_of: :ingredient
has_many :order_products, :through => :ingredient_order_products
IngredientOrderProduct model:
belongs_to :ingredient
belongs_to :order_product
Order Product model:
has_many :ingredient_order_products, inverse_of: :order_product
has_many :ingredients, :through => :ingredient_order_products
accepts_nested_attributes_for :ingredient_order_products, reject_if: :all_blank, allow_destroy: true
Order Controller:
def order_params
params.require(:order).permit(:customer_id, :subtotal, :discount, :total,
order_products_attributes: [[:id, :order_id, :product_id, :qty, :gift, :_destroy,
ingredient_order_products_attributes: [:id, :order_id, :ingredient_id, :_destroy]]])
end
_order_product_fields Partial:
<div id="ingredient">
<%= f.simple_fields_for :ingredient_order_products do |ingredient| %>
<%= render 'ingredient_order_product_fields', f: ingredient %>
<% end %>
<%= link_to_add_association "Aggiungi Ingrediente", f, :ingredient_order_products %>
</div>