Nested Resources id param - ruby-on-rails

Question

I am trying to build Nested Resources Route
First I generate user it's work will and create a user category controller and create item controller but I have a problem when I create an item
First category controller
class Api::V1::CategoriesController < ApplicationController
before_action :authenticate_with_token!, only: [:create, :update, :destroy]
before_action :set_category, only: [:show, :update, :destroy]
# GET /categories
def index
#categories = current_user.category.all
render json: #categories
end
# GET /categories/1
def show
render json: #category
end
# POST /categories
def create
#category = current_user.categories.new(category_params)
if #category.save
render json: #category, status: :created
else
render json: #category.errors, status: :unprocessable_entity
end
end
# PATCH/PUT /categories/1
def update
if #category.update(category_params)
render json: #category
else
render json: #category.errors, status: :unprocessable_entity
end
end
# DELETE /categories/1
def destroy
#category.destroy
end
private
# Use callbacks to share common setup or constraints between actions.
def set_category
#category = current_user.category.find(params[:id])
end
# Only allow a trusted parameter "white list" through.
def category_params
params.require(:category).permit(:title)
end
end
second item controller
class Api::V1::ItemsController < ApplicationController
before_action :authenticate_with_token!, only: [:create, :update, :destroy]
before_action :set_item, only: [:show, :update, :destroy]
# GET /items
def index
#items = current_type.items.all
render json: #items
end
# GET /items/1
def show
render json: #item
end
# POST /items
def create
#item = current_type.item.new(item_params)
if #item.save
render json: #item, status: :created, location: #item
else
render json: #item.errors, status: :unprocessable_entity
end
end
# PATCH/PUT /items/1
def update
if #item.update(item_params)
render json: #item
else
render json: #item.errors, status: :unprocessable_entity
end
end
# DELETE /items/1
def destroy
#item.destroy
#item.image.purge
end
private
# Use callbacks to share common setup or constraints between actions.
def set_item
#item = current_type.item.find(params[:id])
end
# Only allow a trusted parameter "white list" through.
def item_params
params.require(:item).permit(:title, :price, :image)
end
end
Application controller
class ApplicationController < ActionController::API
def current_user
#current_user ||= User.find_by(auth_token: request.headers['Authorization'])
end
def authenticate_with_token!
render json: { errors: "Not authenticated" },status: :unauthorized unless user_signed_in?
end
def user_signed_in?
current_user.present?
end
def prepare_user
#user = User.find(params[:id])
end
def current_type
#current_type ||= Type.find(params[:id])
end
end
my routes
Rails.application.routes.draw do
devise_for :users
namespace :api do
namespace :v1 do
resources :sessions, :only => [:create, :destroy]
resources :users, :only => [:show, :create, :update, :destroy] do
resources :categories do
resources :items
end`
end
end
end
# For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
end
when I try to create the item
ActiveRecord::RecordNotFound (Couldn't find Type without an ID):

Answer 1

If you create an item you do a POST request to the path: /api/v1/users/:user_id/categories/:category_id/items
So the url wil look something like: /api/v1/users/1/categories/1/items
Then I guess the params that you receive are: user_id and category_id and you are missing the param ID that you are looking for.
You should check the logs for what params you receive and adjust your code to pick the right param.