Nested association has_many;through doesn't update collection_check_boxes - ruby-on-rails

Question

Using check boxes to update the nested form I can't update the tables. I received following message:
Unpermitted parameter: :category
ActionController::Parameters
{"name"=>"Flux Capacitor", "price"=>"19.55"} permitted: true
I have tried different ways to fix this through the permitted params, including a :category parameter, like so:
def product_params
params.require(:product).permit(:id, :name, :price, :category, categories_attributes: [:id, :name, :category], categorizations_attributes: [:id, :product_id, :category_ids, :category])
end
My models
class Product < ApplicationRecord
has_many :categorizations
has_many :categories, through: :categorizations
accepts_nested_attributes_for :categories, reject_if: proc {|attributes| attributes['name'].blank?}
accepts_nested_attributes_for :categorizations
end
class Categorization < ApplicationRecord
belongs_to :product, inverse_of: :categorizations
belongs_to :category, inverse_of: :categorizations
end
class Category < ApplicationRecord
has_many :categorizations
has_many :products, through: :categorizations, inverse_of: :category
end
class ProductsController < ApplicationController
def edit
#categories = Category.all
end
def new
#product = Product.new
end
def create
#product = Product.new(product_params)
if #product.save
flash[:notice] = 'Product succesfully created'
redirect_to products_path
else
flash[:notice] = 'Product was not created'
render 'edit'
end
end
def update
if #product.update(product_params)
flash[:notice] = "Product succesfully updated"
redirect_to products_path
else
flash[:notice] = 'Product was not updated'
render 'edit'
end
end
app/view/products/edit.html.erb
<%= simple_form_for(#product) do |f| %>
<%= f.input :name %>
<%= f.input :price %>
<%= f.simple_fields_for #product.categories do |cats| %>
<%= cats.collection_check_boxes :ids, Category.all, :id, :name, collection_wrapper_tag: :ul, item_wrapper_tag: :li %>
<% end %>
<%= f.button :submit %>
<% end %>
This seems like something that is common enough that rails and/or simple_form, should provide in a more built-in way to do this. Am I missing something obvious?

Answer 1

If I am understanding you correctly you should be able to do this without the use of accepts_nested_attributes_for or simple_fields_for. Try something like this:
<%= simple_form_for(#product) do |f| %>
<%= f.input :name %>
<%= f.input :price %>
<%= f.association :categories, as: :check_boxes %>
<%= f.button :submit %>
<% end %>
your strong params should look something like this:
def product_params
params.require(:product).permit(:id, :name, :price, { category_ids: [] }])
end