Update Attributes For Nested Forms - ruby-on-rails-3

Question

Hello I'm creating an online retail store.
I have a Category model and a Sizes model. They are nested in a form. When I create a Category I also create sizes for that category.
Right now I can create a Category and sizes. However I can't update the sizes in the nested form.
So click edit category and change the name of one size then click update. I get the below error. On screen it just says "has already been taken".
How do I update sizes through this nested form?
/Users/Documents/Safsy/Website/Safsy/Safsy/app/controllers/categories_controller.rb # line 40 CategoriesController#update:
39: def update
=> 40: binding.pry
41: if #category.update(category_params)
42: redirect_to #category
43: flash[:success] = 'Category was successfully updated.'
44: else
45: render "edit"
46: end
47: end
[1] pry(#<CategoriesController>)>
Unpermitted parameters: _destroy, id
Unpermitted parameters: _destroy, id
Unpermitted parameters: _destroy, id
Unpermitted parameters: _destroy, id
Unpermitted parameters: _destroy, id
Unpermitted parameters: _destroy, id
Unpermitted parameters: _destroy, id
Unpermitted parameter: _destroy
Unpermitted parameter: _destroy
Unpermitted parameter: _destroy
Unpermitted parameter: _destroy
Unpermitted parameter: _destroy
Unpermitted parameter: _destroy
Unpermitted parameter: _destroy
(0.1ms) begin transaction
Category Load (0.1ms) SELECT "categories".* FROM "categories" WHERE "categories"."id" = ? LIMIT 1 [["id", 64]]
Size Exists (0.1ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'XSmall' LIMIT 1
Size Exists (0.1ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'Small' LIMIT 1
Size Exists (0.1ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'Medium' LIMIT 1
Size Exists (0.1ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'Large' LIMIT 1
Size Exists (0.1ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'XL' LIMIT 1
Size Exists (0.1ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'XXL' LIMIT 1
Size Exists (0.1ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'XXXL' LIMIT 1
CACHE (0.0ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'XSmall' LIMIT 1
CACHE (0.0ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'Small' LIMIT 1
CACHE (0.0ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'Medium' LIMIT 1
CACHE (0.0ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'Large' LIMIT 1
CACHE (0.0ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'XL' LIMIT 1
CACHE (0.0ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'XXL' LIMIT 1
Size Exists (0.1ms) SELECT 1 AS one FROM "sizes" WHERE "sizes"."title" = 'XXXL test' LIMIT 1
Category Exists (0.1ms) SELECT 1 AS one FROM "categories" WHERE ("categories"."name" = 'Shorts' AND "categories"."id" != 68) LIMIT 1
(0.1ms) rollback transaction
Category Model:
class Category < ActiveRecord::Base
has_ancestry
has_many :products
has_many :sizes
validates :name, presence: true, length: { maximum: 20 }, uniqueness: true
accepts_nested_attributes_for :sizes, allow_destroy: true
end
Sizes Model:
class Size < ActiveRecord::Base
validates :title, presence: true, length: { maximum: 15 }
validates :title, uniqueness: true
belongs_to :category
end
Category controller:
class CategoriesController < ApplicationController
before_action :set_category, only: [:show, :edit, :update]
before_action :admin_user, only: [:destroy, :index, :edit, :show]
def index
#categories = Category.all
end
def show
#tags = Product.where(category_id: #category.id).tag_counts_on(:tags)
if params[:tag]
#products = Product.tagged_with(params[:tag])
else
#products = Product.where(category_id: #category.id).order("created_at DESC")
end
end
def new
#category = Category.new
3.times do
#category.sizes.build
end
end
def edit
end
def create
#category = Category.new(category_params)
if #category.save
redirect_to #category
flash[:success] = "You have created a new category"
else
flash[:danger] = "Your category didn't save"
render "new"
end
end
def update
binding.pry
if #category.update(category_params)
redirect_to #category
flash[:success] = 'Category was successfully updated.'
else
render "edit"
end
end
def destroy
category = Category.find(params[:id])
category.sizes.destroy_all
category.destroy
flash[:success] = "Category deleted"
redirect_to categories_path
end
private
def set_category
#category = Category.find(params[:id])
end
def category_params
params.require(:category).permit(:name, :parent_id, size_ids: [], sizes_attributes: [:title])
end
end
Sizes Controller:
class SizesController < ApplicationController
before_action :logged_in_user, only: [:create, :index, :destroy, :update]
before_action :admin_user, only: [:create, :index, :destroy, :update]
def create
#size = Size.create(size_params)
end
def index
#sizes = Size.all
end
def destroy
Size.find(params[:id]).destroy
end
def update
#size.update_attributes(size_params)
end
private
def size_params
params.require(:size).permit(:title, :category_id)
end
end
Here are the params at Category Update method:
39: def update
=> 40: binding.pry
41: if #category.update(category_params)
42: redirect_to #category
43: flash[:success] = 'Category was successfully updated.'
44: else
45: render "edit"
46: end
47: end
[1] pry(#<CategoriesController>)> params
=> {"utf8"=>"✓",
"_method"=>"patch",
"authenticity_token"=>"ZHuWURBwIctFJLgZ1HGNeKvGpK8LlgH9S6Mrh7No/CFdjtwNFoNtfi9NIVHBVhApYH/U5tuOzV0eqhSq/95SCw==",
"category"=>
{"name"=>"Shorts",
"parent_id"=>"64",
"sizes_attributes"=>
{"0"=>{"title"=>"XSmall", "_destroy"=>"false", "id"=>"21"},
"1"=>{"title"=>"Small", "_destroy"=>"false", "id"=>"22"},
"2"=>{"title"=>"Medium", "_destroy"=>"false", "id"=>"23"},
"3"=>{"title"=>"Large", "_destroy"=>"false", "id"=>"24"},
"4"=>{"title"=>"XL", "_destroy"=>"false", "id"=>"25"},
"5"=>{"title"=>"XXL", "_destroy"=>"false", "id"=>"26"},
"6"=>{"title"=>"XXXL test", "_destroy"=>"false", "id"=>"27"}}},
"commit"=>"Update Category",
"controller"=>"categories",
"action"=>"update",
"id"=>"68"}

Answer 1

Permit _destroy and id of nested form like this:-
def category_params
params.require(:category).permit(:name, :parent_id, size_ids: [], sizes_attributes: [:id, :title, :_destroy])
end