Controller

app/controllers/api/v1/brand_controller.rb

@@ -0,0 +1,46 @@
+class Api::V1::BrandController < ApplicationController
+    def index 
+        brand = Brand.all
+        render json: brand, status: :ok
+    end
+
+    def show
+        brand= Brand.find(params[:id])
+        render json: brand, status: :ok    
+    rescue StandardError => e
+        render json: e, status: :not_found 
+    end    
+
+    def create
+        brand = Brand.new(brand_params)
+        brand.save!
+        render json: brand, status: :created
+    rescue StandardError => e
+        render json: e, status: :bad_request
+    end    
+
+
+    def update
+        brand = Brand.find(params[:id])
+        brand.update!(brand_params)
+        render json: brand, status: :ok
+    rescue StandardError => e 
+        render json: e, status: :bad_request
+    end    
+
+    def delete 
+        brand = Brand.find(params[:id])
+        brand.destroy!
+        render json: brand, status: :ok
+    rescue StandardError => e 
+        render json: e, status: :bad_request
+    end    
+
+
+
+    private
+    def brand_params    
+        params.require(:brand).permit(:name)
+    end    
+
+end

app/controllers/api/v1/category_controller.rb

@@ -0,0 +1,45 @@
+class Api::V1::CategoryController < ApplicationController
+    def index 
+        category = Category.all
+        render json: category, status: :ok
+    end
+
+    def show
+        category= Category.find(params[:id])
+        render json: category, status: :ok    
+    rescue StandardError => e
+        render json: e, status: :not_found 
+    end    
+
+    def create
+        category = Category.new(category_params)
+        category.save!
+        render json: category, status: :created
+    rescue StandardError => e
+        render json: e, status: :bad_request
+    end    
+
+
+    def update
+        category = Category.find(params[:id])
+        category.update!(category_params)
+        render json: category, status: :ok
+    rescue StandardError => e 
+        render json: e, status: :bad_request
+    end    
+
+    def delete 
+        category = Category.find(params[:id])
+        category.destroy!
+        render json: category, status: :ok
+    rescue StandardError => e 
+        render json: e, status: :bad_request
+    end    
+
+
+
+    private
+    def category_params    
+        params.require(:category).permit(:name)
+    end    
+end

app/controllers/api/v1/product_controller.rb

@@ -0,0 +1,43 @@
+class Api::V1::ProductController < ApplicationController
+    def index 
+        product = Product.all
+        render json: product, status: :ok
+    end
+
+    def show
+        product= Product.find(params[:id])
+        render json: product, status: :ok    
+    rescue StandardError => e
+        render json: e, status: :not_found 
+    end    
+
+    def create
+        product = Product.new(product_params)
+        product.save!
+        render json: product, status: :created
+    rescue StandardError => e
+        render json: e, status: :bad_request
+    end    
+
+
+    def update
+        product = Product.find(params[:id])
+        product.update!(product_params)
+        render json: product, status: :ok
+    rescue StandardError => e 
+        render json: e, status: :bad_request
+    end    
+
+    def delete 
+        product = Product.find(params[:id])
+        product.destroy!
+        render json: product, status: :ok
+    rescue StandardError => e 
+        render json: e, status: :bad_request
+    end    
+
+    private
+    def product_params    
+        params.require(:product).permit(:name,:description,:price,:stock,:brand_id,:category_id)
+    end
+end

app/models/product.rb

@@ -1,6 +1,9 @@
 class Product < ApplicationRecord
   belongs_to :brand
   belongs_to :category
+  has_many :carts
+  validates :name, presence: :true 
+  validates :description, presence: :true 
   validates :price, presence: :true 
   validates :brand_id, presence: :true
   validates :category_id, presence: :true

app/models/user.rb

@@ -1,5 +1,7 @@
 class User < ApplicationRecord
+    has_many :carts
     validates :name, presence: :true
     validates :email, presence: :true, uniqueness: :true
     validates :password, presence: :true
+
 end

config/routes.rb

@@ -1,3 +1,27 @@
 Rails.application.routes.draw do
-  # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
+  namespace'api' do
+    namespace 'v1' do 
+      scope 'category' do
+        get 'index', to: 'category#index'
+        get 'show/:id', to: 'category#show'
+        post 'create', to: 'category#create'
+        patch 'update/:id', to:  'category#update'
+        delete 'delete/:id', to: 'category#delete'
+      end
+      scope 'brand' do
+        get 'index', to: 'brand#index'
+        get 'show/:id', to: 'brand#show'
+        post 'create', to: 'brand#create'
+        patch 'update/:id', to:  'brand#update'
+        delete 'delete/:id', to: 'brand#delete'
+      end
+      scope 'product' do
+        get 'index', to: 'product#index'
+        get 'show/:id', to: 'product#show'
+        post 'create', to: 'product#create'
+        patch 'update/:id', to:  'product#update'
+        delete 'delete/:id', to: 'product#delete'
+      end
+    end  
+  end      
 end

db/seeds.rb

@@ -1,7 +1,21 @@
-# This file should contain all the record creation needed to seed the database with its default values.
-# The data can then be loaded with the rails db:seed command (or created alongside the database with db:setup).
-#
-# Examples:
-#
-#   movies = Movie.create([{ name: 'Star Wars' }, { name: 'Lord of the Rings' }])
-#   Character.create(name: 'Luke', movie: movies.first)
+Category.create!(name: "Gadgets")
+Category.create!(name: "Clothes")
+Category.create!(name: "Games")
+
+Brand.create!(name: "Macrohard")
+Brand.create!(name: "Vanz")
+Brand.create!(name: "Nontendi")
+
+Product.create!(id:1,name: "Nontendi Switch",description: "vg console ", price: 200,stock: 45,brand_id:1 ,category_id:1 )
+Product.create!(id:2,name: "Mouse rgb 50000 dpi",description: "shiny mouse" ,price: 200,stock: 45,brand_id:1 ,category_id: 1)
+Product.create!(id:3,name: "Drip shoes",description: "good quality shoes", price: 200,stock: 45,brand_id:1 ,category_id: 1)
+Product.create!(id:4,name: "T-shirt",description: "cool shirt ", price: 200,stock: 45,brand_id:1 ,category_id: 1)
+Product.create!(id:5,name: "Sunglasses",description: "emoji ", price: 25,stock: 50,brand_id:1 ,category_id: 1)
+Product.create!(id:6,name: "Mario Golf ",description: "Fun game" ,price: 200,stock: 45,brand_id:1 ,category_id: 1)
+Product.create!(id:7,name: "Galaxy M 44",description: "Powerfull Phone", price: 200,stock: 45,brand_id:1 ,category_id: 1)
+Product.create!(id:8,name: "Ipear",description: "Stylish Phone", price: 200,stock: 45,brand_id:1 ,category_id: 1)
+Product.create!(id:9,name: "Headphone",description: "Enhance your listening experience", price: 200,stock: 45,brand_id:1 ,category_id: 1)
+Product.create!(id:10,name: "Pro Controller",description: "Made for pro gamers", price: 200,stock: 45,brand_id:1 ,category_id: 1)
+
+
+

spec/factories/carts.rb

@@ -1,6 +1,6 @@
 FactoryBot.define do
   factory :cart do
-    product { nil }
-    user { nil }
+    product { create(:product) }
+    user { create(:user) }
   end
 end

spec/factories/categories.rb

@@ -1,5 +1,8 @@
 FactoryBot.define do
+  sequence :categories do |e|
+    "category#{e}"
+  end  
   factory :category do
-    name { "MyString" }
+    name {generate(:categories)}
   end
 end

spec/factories/users.rb

@@ -4,6 +4,6 @@
     email { "MyString" }
     password { "MyString" }
     wallet { 1 }
-    is_admin { false }
+    is_admin { false }  
   end
 end

spec/models/cart_spec.rb

@@ -1,5 +1,7 @@
 require 'rails_helper'
 
 RSpec.describe Cart, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  context "Factory test" do
+    it {expect(build(:cart)).to be_valid}
+  end 
 end

spec/models/product_spec.rb

@@ -31,4 +31,6 @@
     end
   end
 
+
+
 end

spec/requests/api/v1/brand_spec.rb

@@ -0,0 +1,84 @@
+require 'rails_helper'
+
+RSpec.describe "Api::V1::Brands", type: :request do
+  describe "GET /index" do
+    before do
+      create(:brand, id:1, name: 'Beauty')
+      create(:brand, id:2, name: 'Housing')
+    end
+
+
+    it 'return http status ok' do 
+      get '/api/v1/brand/index'
+      expect(response) .to have_http_status(:ok) 
+    end  
+  end
+  describe 'GET /show' do
+    let(:brand) {create(:brand)}
+    context 'id does exist' do
+      before do
+        get"/api/v1/brand/show/#{brand.id}"
+      end
+    end
+    context'id not found' do
+      before do
+        get "/api/v1/brand/show/-1"
+      end
+      it 'return http status not_found' do
+        expect(response).to have_http_status(:not_found)
+      end  
+    end
+  end
+  describe 'POST /create' do
+    let(:brand_params) do 
+      attributes_for(:brand)
+    end 
+    context 'params check ok' do
+      it 'return http status created' do 
+        p brand_params
+        post "/api/v1/brand/create", params:{brand: brand_params}
+        expect(response).to have_http_status(:created)
+      end
+    end
+    context 'bad params' do
+      it 'when param is nil' do 
+        post "/api/v1/brand/create", params:{brand: nil}
+        expect(response).to have_http_status(:bad_request)
+      end
+    end  
+  end
+  describe 'PATCH/update' do  
+    let(:brand) do
+      create(:brand,name: "Kitchen")
+    end  
+    context 'params ok' do
+      it 'return http status ok' do
+        patch "/api/v1/brand/update/#{brand.id}", params:{brand: {name:"Utility"}}
+        expect(response).to have_http_status(:ok)
+      end
+    end    
+    context 'bad params'do
+      it 'when params is nill' do
+          patch "/api/v1/brand/update/#{brand.id}", params:{brand: {name: nil}}
+         expect(response).to have_http_status(:bad_request)
+      end   
+    end
+  end   
+    describe 'DELETE/delete_id' do  
+      let(:brand) do
+        create(:brand)
+      end    
+      context 'params ok' do
+        it 'return http status ok' do
+          delete "/api/v1/brand/delete/#{brand.id}"
+          expect(response).to have_http_status(:ok)
+        end
+      end
+      context 'bad params' do
+        it 'params is nill' do
+          delete "/api/v1/brand/delete/-1"
+          expect(response).to have_http_status(:bad_request)
+        end
+      end   
+  end      
+end