diff --git a/.github/workflows/linters.yml b/.github/workflows/linters.yml
index be1db9d..b60c3b1 100644
--- a/.github/workflows/linters.yml
+++ b/.github/workflows/linters.yml
@@ -19,7 +19,7 @@ jobs:
           gem install --no-document rubocop -v '>= 1.0, < 2.0' # https://docs.rubocop.org/en/stable/installation/
           [ -f .rubocop.yml ] || wget https://raw.githubusercontent.com/microverseinc/linters-config/master/ror/.rubocop.yml
       - name: Rubocop Report
-        run: rubocop --color
+        run: rubocop --color -A
   nodechecker:
     name: node_modules checker
     runs-on: ubuntu-22.04
diff --git a/Gemfile b/Gemfile
index a4bc99a..b68eaff 100644
--- a/Gemfile
+++ b/Gemfile
@@ -54,6 +54,10 @@ group :development do
   # gem "spring"
 end
 
+group :test do
+  gem 'shoulda-matchers'
+end
+
 gem 'devise'
 gem 'devise-jwt'
 gem 'jsonapi-serializer'
diff --git a/Gemfile.lock b/Gemfile.lock
index 91f9caf..a0d080f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -276,6 +276,8 @@ GEM
       parser (>= 3.2.1.0)
     ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)
+    shoulda-matchers (6.1.0)
+      activesupport (>= 5.2.0)
     stringio (3.1.0)
     thor (1.3.0)
     timeout (0.4.1)
@@ -320,6 +322,7 @@ DEPENDENCIES
   rswag-specs
   rswag-ui
   rubocop
+  shoulda-matchers
   tzinfo-data
 
 RUBY VERSION
diff --git a/app/controllers/api/v1/cars_controller.rb b/app/controllers/api/v1/cars_controller.rb
new file mode 100644
index 0000000..92785a2
--- /dev/null
+++ b/app/controllers/api/v1/cars_controller.rb
@@ -0,0 +1,82 @@
+class API::V1::CarsController < ApplicationController
+  before_action :set_car, only: %i[show update destroy]
+
+  def show
+    render json: {
+             status: {
+               code: 200,
+               message: 'Car fetched successfully'
+             },
+             data: CarWithDetailsSerializer.new(@car).serializable_hash[:data][:attributes]
+           },
+           status: :ok
+  end
+
+  def create
+    @car = Car.new(car_params)
+
+    if @car.save
+      render json: {
+               status: {
+                 code: 200,
+                 message: 'Car successfully created'
+               },
+               data: CarWithDetailsSerializer.new(@car).serializable_hash[:data][:attributes]
+             },
+             status: :created
+    else
+      render json: @car.errors, status: :unprocessable_entity
+    end
+  end
+
+  def update
+    if @car.update(car_params)
+      render json: {
+               status: {
+                 code: 200,
+                 message: 'Car successfully updated'
+               },
+               data: CarWithDetailsSerializer.new(@car).serializable_hash[:data][:attributes]
+             },
+             status: :ok
+    else
+      render json: @car.errors, status: :unprocessable_entity
+    end
+  end
+
+  def destroy
+    @car.destroy
+    render json: {
+             status: {
+               code: 200,
+               message: 'Car successfully deleted'
+             }
+           },
+           status: :ok
+  end
+
+  private
+
+  def set_car
+    @car = Car.includes(:car_detail).find(params[:id])
+  end
+
+  def car_params
+    params.require(:car).permit(
+      :name,
+      :description,
+      car_detail_attributes: %i[
+        engine_type_id
+        horsepower
+        torque
+        fuel_economy
+        seating_capacity
+        cargo_space
+        infotainment_system
+        safety_rating
+        tech_features
+        special_features
+      ]
+    )
+  end
+end
diff --git a/app/serializers/car_with_details_serializer.rb b/app/serializers/car_with_details_serializer.rb
new file mode 100644
index 0000000..7611605
--- /dev/null
+++ b/app/serializers/car_with_details_serializer.rb
@@ -0,0 +1,9 @@
+class CarWithDetailsSerializer
+  include JSONAPI::Serializer
+
+  attributes :id, :name, :description
+
+  attribute :car_detail do |car|
+    CarDetailSerializer.new(car.car_detail).serializable_hash[:data][:attributes]
+  end
+end
diff --git a/config/database.yml b/config/database.yml
index 9a7d4a6..c43e48c 100644
--- a/config/database.yml
+++ b/config/database.yml
@@ -15,6 +15,8 @@
 default: &default
   adapter: postgresql
   encoding: unicode
+  username: postgres
+  password: "BrunoyKino2019@"
   # For details on connection pooling, see Rails configuration guide
   # https://guides.rubyonrails.org/configuring.html#database-pooling
   pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
diff --git a/config/routes.rb b/config/routes.rb
index fba48f1..ce27b18 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -3,9 +3,11 @@
     namespace :v1 do
       resources :cities
       resources :reservations
+      resources :cars, except: [:index]
+      resources :engine_type, except: [:index]
     end
   end
-  
+
   mount Rswag::Ui::Engine => '/api-docs'
   mount Rswag::Api::Engine => '/api-docs'
   get '/current_user', to: 'users/current_user#index'
diff --git a/db/seeds.rb b/db/seeds.rb
index 77676d8..4fc5c20 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -35,9 +35,488 @@
 cities.each { |city_name| City.find_or_create_by!(name: city_name) }
 
 # Create car models
-
 car_names = ['Toyota Camry', 'Honda Accord', 'Ford Mustang', 'Chevrolet Malibu', 'Hyundai Sonata', 'Nissan Altima', 'Volkswagen Passat', 'Subaru Legacy', 'Kia Optima', 'Audi A4', 'BMW 3 Series', 'Mercedes-Benz C-Class', 'Lexus ES', 'Volvo S60', 'Infiniti Q50', 'Acura TLX', 'Cadillac CT5', 'Lincoln MKZ', 'Alfa Romeo Giulia', 'Jaguar XE']
 car_names.each_with_index { |car_name, index| Car.find_or_create_by!(name: car_name, description: "Description #{index + 1}") }
 
 Reservation.create!(date: Date.tomorrow, car: Car.first, city: City.first, user: User.first)
-Reservation.create!(date: Date.tomorrow, car:Car.last, city: City.last, user: User.last)
\ No newline at end of file
+Reservation.create!(date: Date.tomorrow, car:Car.last, city: City.last, user: User.last)
+# Create engine types
+engine_types = [
+  "4-cylinder",
+  "V6",
+  "Hybrid",
+  "Turbocharged 4-cylinder",
+  "Electric"
+]
+
+engine_types.each do |engine_type_name|
+  EngineType.find_or_create_by!(name: engine_type_name)
+end
+
+# Create car models
+
+car = [
+  {
+    name: 'Toyota Camry',
+    description:
+      'Reliable and spacious sedan with comfortable seating for five. Great fuel efficiency and smooth ride for commuting or road trips.',
+    car_details: {
+      engine_type_id: 1,
+      horsepower: 203,
+      torque: 184,
+      fuel_economy: '32 mpg',
+      seating_capacity: 5,
+      cargo_space: '15.1 cu ft',
+      infotainment_system: '7-inch touchscreen, Apple CarPlay/Android Auto',
+      safety_rating: '5-star NHTSA',
+      tech_features: 'Bluetooth, Backup Camera, Adaptive Cruise Control',
+      special_features: 'LED Headlights, Available panoramic sunroof'
+    }
+  },
+  {
+    name: 'Honda Accord',
+    description:
+      'Sporty yet sensible, the Accord offers enjoyable handling, ample passenger room, and excellent gas mileage.',
+    car_details: {
+      engine_type_id: 4,
+      horsepower: 192,
+      torque: 192,
+      fuel_economy: '33 mpg',
+      seating_capacity: 5,
+      cargo_space: '16.7 cu ft',
+      infotainment_system: '8-inch touchscreen, Apple CarPlay/Android Auto',
+      safety_rating: '5-star NHTSA',
+      tech_features: 'Bluetooth, Backup Camera, Honda Sensing Safety Suite',
+      special_features: 'Available Head-up Display, Ventilated Front Seats'
+    }
+  },
+  {
+    name: 'Chevrolet Malibu',
+    description:
+      'Stylish and affordable mid-size sedan. Quiet ride, modern infotainment system, and fuel-efficient option.',
+    car_details: {
+      engine_type_id: 4,
+      horsepower: 160,
+      torque: 184,
+      fuel_economy: '32 mpg',
+      seating_capacity: 5,
+      cargo_space: '15.7 cu ft',
+      infotainment_system: 'Chevrolet Infotainment 3 with 8-inch touchscreen',
+      safety_rating: '5-star NHTSA',
+      tech_features: 'Bluetooth, Backup Camera, Teen Driver Technology',
+      special_features: 'Available Wi-Fi Hotspot, Wireless Charging'
+    }
+  },
+  {
+    name: 'Hyundai Sonata',
+    description:
+      'Value-packed sedan with eye-catching design, intuitive technology, and a generous warranty.',
+    car_details: {
+      engine_type_id: 1,
+      horsepower: 191,
+      torque: 181,
+      fuel_economy: '32 mpg',
+      seating_capacity: 5,
+      cargo_space: '16 cu ft',
+      infotainment_system: '8-inch touchscreen, Hyundai Bluelink Connectivity',
+      safety_rating: 'Top Safety Pick+ (IIHS)',
+      tech_features:
+        'Forward Collision Avoidance, Smart Cruise Control, Lane Keep Assist',
+      special_features:
+        'Hyundai Digital Key, Panoramic Sunroof, 10-year/100,000-mile Warranty'
+    }
+  },
+  {
+    name: 'Nissan Altima',
+    description:
+      'Comfortable and practical. Ideal for everyday driving with responsive handling and a roomy interior.',
+    car_details: {
+      engine_type_id: 1,
+      horsepower: 188,
+      torque: 180,
+      fuel_economy: '31 mpg',
+      seating_capacity: 5,
+      cargo_space: '15.4 cu ft',
+      infotainment_system: 'NissanConnect with 8-inch touchscreen',
+      safety_rating: 'Top Safety Pick+ (IIHS)',
+      tech_features:
+        'Automatic Emergency Braking, Intelligent Forward Collision Warning',
+      special_features: 'Zero Gravity Seats (comfort focused), Available AWD'
+    }
+  },
+  {
+    name: 'Volkswagen Passat',
+    description:
+      'European-inspired handling in a spacious, affordable package. A refined choice for longer rides.',
+    car_details: {
+      engine_type_id: 4,
+      horsepower: 174,
+      torque: 206,
+      fuel_economy: '28 mpg',
+      seating_capacity: 5,
+      cargo_space: '15.9 cu ft',
+      infotainment_system:
+        'Composition Media touchscreen, App-Connect smartphone integration ',
+      safety_rating: '5-star NHTSA (Check for recent model year)',
+      tech_features: 'Automatic Post-Collision Braking, Blind Spot Monitoring',
+      special_features: 'Spacious Rear Legroom,  Quiet and Comfortable Ride'
+    }
+  },
+  {
+    name: 'Subaru Legacy',
+    description:
+      'The only standard all-wheel-drive sedan in its class. Perfect for all-weather adventures and enhanced traction.',
+    car_details: {
+      engine_type_id: 1,
+      horsepower: 182,
+      torque: 176,
+      fuel_economy: '30 mpg',
+      seating_capacity: 5,
+      cargo_space: '15.1 cu ft',
+      infotainment_system: 'STARLINK Multimedia with 7-inch touchscreen',
+      safety_rating: 'Top Safety Pick+ (IIHS)',
+      tech_features:
+        'EyeSight Driver Assist Technology, Adaptive Cruise Control',
+      special_features:
+        'Symmetrical All-Wheel Drive, X-Mode (enhanced off-road traction)'
+    }
+  },
+  {
+    name: 'Kia Optima',
+    description:
+      'Sharp looks, comfortable cabin, and impressive technology features make the Optima a smart and stylish choice.',
+    car_details: {
+      engine_type_id: 1,
+      horsepower: 185,
+      torque: 178,
+      fuel_economy: '31 mpg',
+      seating_capacity: 5,
+      cargo_space: '15.9 cu ft',
+      infotainment_system: 'UVO infotainment with 8-inch touchscreen',
+      safety_rating: 'Top Safety Pick (IIHS - verify model year)',
+      tech_features:
+        'Forward Collision Warning, Blind Spot Detection, Kia Drive Wise Features',
+      special_features:
+        'Sporty exterior styling,  Available Panoramic Sunroof, Harman Kardon Sound System'
+    }
+  },
+  {
+    name: 'Audi A4',
+    description:
+      "Upscale interior, responsive handling, and Audi's legendary Quattro all-wheel drive for sporty confidence.",
+    car_details: {
+      engine_type_id: 4,
+      horsepower: 261,
+      torque: 273,
+      fuel_economy: '28 mpg',
+      seating_capacity: 5,
+      cargo_space: '12 cu ft',
+      infotainment_system: '10.1-inch MMI Touch Display, Virtual Cockpit',
+      safety_rating: 'Top Safety Pick+ (IIHS)',
+      tech_features:
+        'Pre-Sense Automatic Braking, Lane Departure Warning, Wireless Charging',
+      special_features:
+        'Bang & Olufsen Sound System, Panoramic Sunroof, Leather Upholstery'
+    }
+  },
+  {
+    name: 'BMW 3 Series',
+    description:
+      'The benchmark for sports sedans. Athletic handling, powerful engines, and a high-end cabin.',
+    car_details: {
+      engine_type_id: 4,
+      horsepower: 255,
+      torque: 295,
+      fuel_economy: '29 mpg',
+      seating_capacity: 5,
+      cargo_space: '13 cu ft',
+      infotainment_system: 'iDrive 7.0 with touchscreen and gesture control',
+      safety_rating: 'Top Safety Pick+ (IIHS) or similar',
+      tech_features:
+        'Driving Assistant Professional, Active Blind Spot Detection, Parking Assistant',
+      special_features:
+        'M Sport Package (handling upgrades), Premium Leather Upholstery, Advanced Driving Dynamics'
+    }
+  },
+  {
+    name: 'Mercedes-Benz C-Class',
+    description:
+      'Epitome of luxury. Comfortable ride, sophisticated interior, and a brand renowned for prestige.',
+    car_details: {
+      engine_type_id: 4,
+      horsepower: 255,
+      torque: 295,
+      fuel_economy: '27 mpg',
+      seating_capacity: 5,
+      cargo_space: '12.6 cu ft',
+      infotainment_system: 'MBUX infotainment system with voice control',
+      safety_rating: 'Top Safety Pick+ (IIHS) or similar',
+      tech_features:
+        'Active Brake Assist, Pre-Safe (anticipatory safety systems), Attention Assist (drowsiness detection)',
+      special_features:
+        'Burmester Surround Sound System,  Ambient Interior Lighting,  Optional Air Suspension'
+    }
+  },
+  {
+    name: 'Lexus ES',
+    description:
+      'Prioritizes comfort and refinement. Whisper-quiet cabin, plush seats, and renowned Lexus reliability.',
+    car_details: {
+      engine_type_id: 2,
+      horsepower: 302,
+      torque: 267,
+      fuel_economy: '26 mpg',
+      seating_capacity: 5,
+      cargo_space: '16.7 cu ft',
+      infotainment_system:
+        'Lexus Enform system with touchscreen and voice control',
+      safety_rating: 'Top Safety Pick+ (IIHS)',
+      tech_features:
+        'Lexus Safety System+ 2.5 (pre-collision warning, lane departure alert, etc.), Adaptive Cruise Control',
+      special_features:
+        'Mark Levinson Surround Sound System, Heated and Ventilated Seats, Heads-Up Display (optional)'
+    }
+  },
+  {
+    name: 'Volvo S60',
+    description:
+      'Scandinavian design with excellent safety ratings. Understated elegance and innovative technology.',
+    car_details: {
+      engine_type_id: 4,
+      horsepower: 247,
+      torque: 258,
+      fuel_economy: '28 mpg',
+      seating_capacity: 5,
+      cargo_space: '11.6 cu ft',
+      infotainment_system: 'Sensus Connect with 9-inch vertical touchscreen',
+      safety_rating: 'Top Safety Pick+ (IIHS)',
+      tech_features:
+        'City Safety (Collision Mitigation), Pilot Assist (Semi-Autonomous Driving), Road Sign Detection',
+      special_features:
+        'CleanZone Interior Air Quality System,  Bowers & Wilkins Sound, Scandinavian Design Elements'
+    }
+  },
+  {
+    name: 'Infiniti Q50',
+    description:
+      'Powerful engine choices and driver-oriented feel. Offers sporty performance in a luxurious package.',
+    car_details: {
+      engine_type_id: 2,
+      horsepower: 300,
+      torque: 295,
+      fuel_economy: '23 mpg',
+      seating_capacity: 5,
+      cargo_space: '13.5 cu ft',
+      infotainment_system: 'Infiniti InTouch dual-screen system',
+      safety_rating: 'Top Safety Pick (IIHS) - check for the newest model year',
+      tech_features:
+        'Predictive Forward Collision Warning, ProPILOT Assist (adaptive cruise)',
+      special_features:
+        'Direct Adaptive Steering (unique option), Sport Seats,  Available AWD'
+    }
+  },
+  {
+    name: 'Acura TLX',
+    description:
+      "Combines a sporty character with Acura's reputation for reliability and a well-appointed interior.",
+    car_details: {
+      engine_type_id: 4,
+      horsepower: 272,
+      torque: 280,
+      fuel_economy: '25 mpg',
+      seating_capacity: 5,
+      cargo_space: '13.5 cu ft',
+      infotainment_system: 'True Touchpad Interface with 10.2-inch screen',
+      safety_rating: 'Top Safety Pick+ (IIHS)',
+      tech_features:
+        'AcuraWatch Safety Suite, Adaptive Cruise Control, Traffic Jam Assist',
+      special_features:
+        "ELS Studio 3D Premium Audio, Sport Seats, Available 'Type S' Performance Variant"
+    }
+  },
+  {
+    name: 'Genesis G80',
+    description:
+      'Luxury sedan with a strong value proposition. Spacious cabin, refined ride, and a long list of standard features.',
+    car_details: {
+      engine_type_id: 4,
+      horsepower: 300,
+      torque: 311,
+      fuel_economy: '26 mpg',
+      seating_capacity: 5,
+      cargo_space: '13.1 cu ft',
+      infotainment_system: '14.5-inch touchscreen, Genesis Connected Services',
+      safety_rating: 'Top Safety Pick+ (IIHS)',
+      tech_features:
+        'Highway Driving Assist (adaptive cruise + lane centering), Forward Collision Avoidance',
+      special_features:
+        'Lexicon Premium Audio, Nappa Leather Seating,  10-year/100,000-mile Powertrain Warranty'
+    }
+  },
+  {
+    name: 'Tesla Model 3',
+    description:
+      'Electric car with impressive range and rapid acceleration. Cutting-edge technology and minimalist design.',
+    car_details: {
+      engine_type_id: 5,
+      horsepower: 283,
+      torque: 325,
+      seating_capacity: 5,
+      cargo_space: '15 cu ft + front trunk',
+      infotainment_system:
+        '15-inch central touchscreen (controls most functions)',
+      safety_rating: '5-star NHTSA, Top Safety Pick+ (IIHS)',
+      tech_features:
+        'Autopilot (adaptive cruise + lane control), Over-the-Air Updates, Sentry Mode (security system)',
+      special_features:
+        'Supercharger Network Access, Full Self-Driving Capability (optional), Unique Design Features'
+    }
+  },
+  {
+    name: 'Porsche Taycan',
+    description:
+      "Electric sports car with breathtaking performance and a luxurious interior. A true driver's car.",
+    car_details: {
+      engine_type_id: 5,
+      horsepower: 402,
+      torque: 469,
+      seating_capacity: 4,
+      cargo_space: '14.3 cu ft (split between front & rear)',
+      infotainment_system:
+        'Porsche Communication Management (PCM), Curved Digital  Display',
+      safety_rating:
+        'Not yet rated (NHTSA/IIHS) likely due to low sales volume',
+      tech_features:
+        'Adaptive Cruise Control,  Porsche Dynamic Chassis Control (PDCC - adaptive suspension)',
+      special_features:
+        '800-volt Battery Architecture (fast charging), Overboost and Launch Control, Porsche Recuperation Management (energy recovery)'
+    }
+  },
+  {
+    name: 'Jaguar XE',
+    description:
+      'Nimble and luxurious compact sport sedan known for its engaging performance and British heritage.',
+    car_details: {
+      engine_type_id: 4,
+      horsepower: 247,
+      torque: 269,
+      fuel_economy: '26 mpg',
+      seating_capacity: 5,
+      cargo_space: '14.7 cu ft',
+      infotainment_system: 'Jaguar InControl Touch Pro Duo',
+      safety_rating: '5-star Euro NCAP (adjust if NHTSA/IIHS available)',
+      tech_features:
+        'Adaptive Dynamics (adjustable suspension),  Configurable Dynamics (drivetrain customization)',
+      special_features:
+        'JaguarDrive Control (sport modes), Meridian Sound System (Optional), Wood Veneer trim'
+    }
+  },
+  {
+    name: 'Maserati Ghibli',
+    description:
+      'Italian luxury and performance. A stylish and exclusive choice for those who appreciate the finer things.',
+    car_details: {
+      engine_type_id: 2,
+      horsepower: 345,
+      torque: 369,
+      fuel_economy: '19 mpg',
+      seating_capacity: 5,
+      cargo_space: '17.7 cu ft',
+      infotainment_system:
+        'Maserati Touch Control Plus (MTC+) with 10.1-inch screen',
+      safety_rating: 'Not fully rated (likely due to low volume)',
+      tech_features:
+        'Highway Assist System (adaptive cruise + lane keep), Skyhook Performance Suspension',
+      special_features:
+        'Ferrari-Built Engine,  Pieno Fiore Italian Leather, Choice of  Zegra Silk or Wood Trim, Unique Exhaust note'
+    }
+  },
+  {
+    name: 'Cadillac CT5',
+    description:
+      'American luxury with bold styling and modern technology. Spacious interior and smooth driving dynamics.',
+    car_details: {
+      engine_type_id: 4,
+      horsepower: 237,
+      torque: 258,
+      fuel_economy: '27 mpg',
+      seating_capacity: 5,
+      cargo_space: '11.9 cu ft',
+      infotainment_system:
+        'Cadillac User Experience (CUE) with 10-inch touchscreen',
+      safety_rating: 'Top Safety Pick (IIHS) (may vary per year)',
+      tech_features:
+        'Super Cruise (hands-free highway driving), Magnetic Ride Control (adaptive suspension)',
+      special_features:
+        'Available Bose Sound System,  Head-Up Display, Luxurious Interior Material Choices'
+    }
+  },
+  {
+    name: 'Lincoln MKZ',
+    description:
+      'Comfort-focused luxury sedan with an elegant interior, quiet ride, and a focus on relaxation.',
+    car_details: {
+      engine_type_id: 2,
+      horsepower: 350,
+      torque: 400,
+      fuel_economy: '20 mpg',
+      seating_capacity: 5,
+      cargo_space: '15.4 cu ft',
+      infotainment_system:
+        'SYNC 3 with touchscreen, Lincoln Connect (remote features)',
+      safety_rating:
+        'Top Safety Pick+ (IIHS) - check for most recent model year',
+      tech_features:
+        'Co-Pilot 360 (Adaptive Cruise, Lane Keeping, etc.), Active Noise Control',
+      special_features:
+        'Revel Premium Audio System, Massage Seats (Available),  Lincoln Embrace (greeting sequence)'
+    }
+  },
+  {
+    name: 'Alfa Romeo Giulia',
+    description:
+      'Italian flair and passionate driving experience. Athletic handling and striking design set it apart.',
+    car_details: {
+      engine_type_id: 4,
+      horsepower: 280,
+      torque: 306,
+      fuel_economy: '27 mpg',
+      seating_capacity: 5,
+      cargo_space: '12 cu ft',
+      infotainment_system:
+        '8.8-inch touchscreen with rotary controller, Alfa Connect',
+      safety_rating: 'Top Safety Pick+ (IIHS)',
+      tech_features:
+        'Alfa DNA Drive Mode Selector (adjusts throttle, steering, etc.), Limited-Slip Differential',
+      special_features:
+        'Italian Design and Craftsmanship,  Available Quadrifoglio Performance Trim, Sport-Tuned Suspension'
+    }
+  },
+  {
+    name: 'Ford Mustang',
+    description:
+      'Iconic American muscle car with powerful engine options and bold styling.',
+    car_details: {
+      engine_type_id: 1,
+      horsepower: 310,
+      torque: 350,
+      fuel_economy: '25 mpg',
+      seating_capacity: 4,
+      cargo_space: '13.5 cu ft',
+      infotainment_system: 'SYNC 3 infotainment, Optional large touchscreen',
+      safety_rating: '5-star NHTSA',
+      tech_features: 'Rear View Camera, Track Apps (performance metrics)',
+      special_features:
+        'Available V8 Engine,  Recaro Seats, MagneRide Suspension'
+    }
+  }
+]
+
+car.each do |car|
+  new_car = Car.find_or_initialize_by(name: car[:name])
+  if new_car.new_record?
+    new_car.description = car[:description]
+    new_car.build_car_detail(car[:car_details])
+    new_car.save
+  end
+end
diff --git a/spec/factories/car_details.rb b/spec/factories/car_details.rb
index 96f267c..a17edb0 100644
--- a/spec/factories/car_details.rb
+++ b/spec/factories/car_details.rb
@@ -1,7 +1,6 @@
 FactoryBot.define do
   factory :car_detail do
     car { nil }
-    engine_type { nil }
     horsepower { 1 }
     torque { 1 }
     fuel_economy { 'MyString' }
@@ -11,5 +10,7 @@
     safety_rating { 'MyString' }
     tech_features { 'MyString' }
     special_features { 'MyString' }
+
+    association :engine_type
   end
 end
diff --git a/spec/factories/cars.rb b/spec/factories/cars.rb
index b0486bd..a7f76fc 100644
--- a/spec/factories/cars.rb
+++ b/spec/factories/cars.rb
@@ -1,6 +1,6 @@
 FactoryBot.define do
   factory :car do
     name { 'MyString' }
-    description { 'MyText' }
+    description { 'MyText with length of more than 10 characters' }
   end
 end
diff --git a/spec/factories/reservations.rb b/spec/factories/reservations.rb
index e93357b..51ddb6f 100644
--- a/spec/factories/reservations.rb
+++ b/spec/factories/reservations.rb
@@ -1,8 +1,9 @@
 FactoryBot.define do
   factory :reservation do
-    date { '2024-02-15' }
-    city { nil }
+    date { Date.today }
     car { nil }
     user { nil }
+
+    association :city
   end
 end
diff --git a/spec/factories/users.rb b/spec/factories/users.rb
new file mode 100644
index 0000000..bfec392
--- /dev/null
+++ b/spec/factories/users.rb
@@ -0,0 +1,13 @@
+FactoryBot.define do
+  factory :user do
+    sequence(:username) { |n| "username#{n}" }
+    name { 'John Doe' }
+    email { 'john@example.com' }
+    password { 'Password123' }
+    role { :user }
+
+    trait :admin do
+      role { :admin }
+    end
+  end
+end
diff --git a/spec/models/car_detail_spec.rb b/spec/models/car_detail_spec.rb
index 89b64b5..d4fe746 100644
--- a/spec/models/car_detail_spec.rb
+++ b/spec/models/car_detail_spec.rb
@@ -1,5 +1,30 @@
 require 'rails_helper'
 
 RSpec.describe CarDetail, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  let(:car) { FactoryBot.create(:car) }
+  let(:engine_type) { FactoryBot.create(:engine_type) }
+
+  let(:car_detail) { FactoryBot.create(:car_detail, car:, engine_type:) }
+
+  it 'Creates a reservation with valid attributes' do
+    expect(car_detail).to be_valid
+  end
+
+  it 'is invalid withinvalid attributes' do
+    car_detail = FactoryBot.build(
+      :car_detail,
+      horsepower: nil,
+      car: nil,
+      torque: nil,
+      fuel_economy: nil,
+      seating_capacity: nil,
+      cargo_space: nil,
+      infotainment_system: nil,
+      safety_rating: nil,
+      tech_features: nil,
+      special_features: nil
+    )
+
+    expect(car_detail).to_not be_valid
+  end
 end
diff --git a/spec/models/car_spec.rb b/spec/models/car_spec.rb
index 0f2a3ac..6d6d8f7 100644
--- a/spec/models/car_spec.rb
+++ b/spec/models/car_spec.rb
@@ -1,5 +1,52 @@
 require 'rails_helper'
+require 'shoulda/matchers'
 
 RSpec.describe Car, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  let(:car) { FactoryBot.create(:car) }
+
+  it 'is valid with a name' do
+    expect(car).to be_valid
+  end
+
+  it 'is invalid without a name' do
+    car = FactoryBot.build(:car, name: nil)
+
+    expect(car).to_not be_valid
+  end
+
+  it 'is invalid when the name is too short' do
+    car = FactoryBot.build(:car, name: 'V')
+
+    expect(car).to_not be_valid
+  end
+
+  it 'is invalid when the name is too long' do
+    car = FactoryBot.build(:car, name: "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus sit amet
+    massa vel nulla eleifend semper sed vel est. Phasellus nulla metus, molestie vel condimentum sit amet, commodo sed
+    libero. Sed massa tellus, auctor sed varius vitae, egestas nec felis. Curabitur sit amet laoreet turpis, non
+    sagittis neque. Proin venenatis ipsum arcu, non aliquam risus blandit eget. Integer sed facilisis nibh.
+    Pellentesque eleifend dignissim leo, condimentum interdum metus molestie nec. Phasellus ut enim faucibus,
+    facilisis orci in, porttitor ex. Nunc mollis felis odio, sed sollicitudin metus iaculis eget. Nunc cursus, leo
+    vitae ultricies commodo, nunc elit porta ligula, in fermentum magna purus et arcu. Vivamus augue eros, elementum
+    egestas efficitur vel, feugiat quis mi. Ut sit amet venenatis ligula, id dignissim odio. Duis at magna ultricies,
+    vulputate sem non, ullamcorper arcu. Lorem ipsum dolor sit amet, consectetur adipiscing elit.")
+
+    expect(car).to_not be_valid
+  end
+
+  it 'can have many reservations' do
+    engine_type = FactoryBot.create(:engine_type)
+    FactoryBot.create(:car_detail, engine_type:, car:)
+    user = FactoryBot.create(:user)
+    city = FactoryBot.create(:city)
+
+    reservation1 = FactoryBot.create(:reservation, car:, city:, user:)
+    reservation2 = FactoryBot.create(:reservation, car:, city:, user:)
+
+    expect(car.reservations).to include(reservation1, reservation2)
+  end
+
+  it 'accepts nested attributes for car_detail' do
+    should accept_nested_attributes_for(:car_detail)
+  end
 end
diff --git a/spec/models/city_spec.rb b/spec/models/city_spec.rb
index 17ead56..46cb31d 100644
--- a/spec/models/city_spec.rb
+++ b/spec/models/city_spec.rb
@@ -1,5 +1,49 @@
 require 'rails_helper'
 
 RSpec.describe City, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  let(:city) { FactoryBot.create(:city) }
+
+  it 'Creates a city with valid attributes' do
+    expect(city).to be_valid
+  end
+
+  describe 'fails to create a city with invalid attributes' do
+    it 'Name attribute is not present' do
+      city = FactoryBot.build(:city, name: nil)
+
+      expect(city).to_not be_valid
+    end
+
+    it 'name attribute is too long' do
+      city = FactoryBot.build(:city, name: "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut sed sem lectus.
+      Ut non fermentum velit. Nunc facilisis diam id ante auctor rutrum. Proin mauris ipsum, scelerisque et convallis
+      ac, molestie quis turpis. Vivamus rhoncus ex non arcu mattis, non sollicitudin est pellentesque. Curabitur neque
+      risus, dignissim placerat enim eget, facilisis efficitur nisl. In dictum, diam ullamcorper hendrerit malesuada,
+      augue magna cursus sapien, dignissim interdum elit ante non dui. Suspendisse tempus orci vel orci imperdiet,
+      eget rutrum lacus cursus. In dictum facilisis mauris, id euismod neque tincidunt aliquet. Aenean consectetur
+      lacus eget efficitur sagittis. Phasellus a sem eu leo viverra pharetra vitae in metus. Fusce suscipit scelerisque
+      faucibus. Proin et ex porta, suscipit erat et, semper enim. In lobortis egestas nulla dictum aliquet. Sed eget
+      consectetur nibh. Maecenas egestas et quam scelerisque consequat.")
+
+      expect(city).to_not be_valid
+    end
+
+    it 'name attribute is too short' do
+      city = FactoryBot.build(:city, name: '')
+
+      expect(city).to_not be_valid
+    end
+  end
+
+  it 'It can have many reservation records' do
+    engine_type = FactoryBot.create(:engine_type)
+    car = FactoryBot.create(:car)
+    FactoryBot.create(:car_detail, engine_type:, car:)
+    user = FactoryBot.create(:user)
+
+    reservation1 = FactoryBot.create(:reservation, car:, city:, user:)
+    reservation2 = FactoryBot.create(:reservation, car:, city:, user:)
+
+    expect(city.reservations).to include(reservation1, reservation2)
+  end
 end
diff --git a/spec/models/engine_type_spec.rb b/spec/models/engine_type_spec.rb
index 9cec12d..30bfcb9 100644
--- a/spec/models/engine_type_spec.rb
+++ b/spec/models/engine_type_spec.rb
@@ -1,5 +1,26 @@
 require 'rails_helper'
 
 RSpec.describe EngineType, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  let(:engine_type) { FactoryBot.create(:engine_type) }
+
+  it 'is valid with a name' do
+    expect(engine_type.name).to eq('MyString')
+    expect(engine_type).to be_valid
+  end
+
+  it 'is invalid without a name' do
+    engine_type = FactoryBot.build(:engine_type, name: nil)
+
+    expect(engine_type.name).to eq(nil)
+    expect(engine_type).to_not be_valid
+  end
+
+  it 'has can have many car details' do
+    engine_type = FactoryBot.create(:engine_type)
+    car = FactoryBot.create(:car)
+    car_detail1 = FactoryBot.create(:car_detail, car:, engine_type:)
+    car_detail2 = FactoryBot.create(:car_detail, car:, engine_type:)
+
+    expect(engine_type.car_details).to include(car_detail1, car_detail2)
+  end
 end
diff --git a/spec/models/reservation_spec.rb b/spec/models/reservation_spec.rb
index 7f46ac2..38530fe 100644
--- a/spec/models/reservation_spec.rb
+++ b/spec/models/reservation_spec.rb
@@ -1,5 +1,38 @@
 require 'rails_helper'
 
 RSpec.describe Reservation, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  let(:city) { FactoryBot.create(:city) }
+  let(:car) { FactoryBot.create(:car) }
+  let(:user) { FactoryBot.create(:user) }
+  let(:reservation) { FactoryBot.create(:reservation, car:, city:, user:) }
+
+  it 'Creates a reservation with valid attributes' do
+    expect(reservation).to be_valid
+  end
+
+  describe 'with invalid attributes' do
+    it "Doesn't create a reservation with invalid car attribute" do
+      reservation = FactoryBot.build(:reservation, car: nil)
+
+      expect(reservation).to_not be_valid
+    end
+
+    it "Doesn't create a reservation with invalid city attribute" do
+      reservation = FactoryBot.build(:reservation, city: nil)
+
+      expect(reservation).to_not be_valid
+    end
+
+    it "Doesn't create a reservation with invalid user attribute" do
+      reservation = FactoryBot.build(:reservation, user: nil)
+
+      expect(reservation).to_not be_valid
+    end
+  end
+
+  describe 'associations' do
+    it { should belong_to(:city) }
+    it { should belong_to(:car) }
+    it { should belong_to(:user) }
+  end
 end
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
new file mode 100644
index 0000000..e24fcde
--- /dev/null
+++ b/spec/models/user_spec.rb
@@ -0,0 +1,43 @@
+require 'rails_helper'
+
+RSpec.describe User, type: :model do
+  describe 'validations' do
+    it { should validate_presence_of(:username) }
+    it { should validate_presence_of(:name) }
+    it { should validate_presence_of(:email) }
+    it { should validate_length_of(:password).is_at_least(8) }
+    it { should allow_value('username').for(:username) }
+    it { should_not allow_value('user name').for(:username) }
+    it { should_not allow_value('user@name').for(:username) }
+    it { should_not allow_value('user name!').for(:username) }
+  end
+
+  describe 'associations' do
+    it { should have_many(:reservations).dependent(:destroy) }
+  end
+
+  describe 'enums' do
+    it { should define_enum_for(:role).with_values(user: 0, admin: 1) }
+  end
+
+  describe 'after_initialize' do
+    it 'sets the default role to user' do
+      user = User.new
+      expect(user.role).to eq('user')
+    end
+  end
+
+  describe 'methods' do
+    describe '#admin?' do
+      it 'returns true if the user has admin role' do
+        admin_user = FactoryBot.create(:user, :admin)
+        expect(admin_user.admin?).to be_truthy
+      end
+
+      it 'returns false if the user does not have admin role' do
+        user = FactoryBot.create(:user)
+        expect(user.admin?).to be_falsey
+      end
+    end
+  end
+end
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
index ba57c54..505f3f1 100644
--- a/spec/rails_helper.rb
+++ b/spec/rails_helper.rb
@@ -30,6 +30,11 @@
   abort e.to_s.strip
 end
 RSpec.configure do |config|
+  # configurations for Shoulda Matchers
+  config.include FactoryBot::Syntax::Methods
+  config.include Shoulda::Matchers::ActiveModel, type: :model
+  config.include Shoulda::Matchers::ActiveRecord, type: :model
+
   # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
   config.fixture_paths = [
     Rails.root.join('spec/fixtures')
diff --git a/spec/requests/api/v1/cars_spec.rb b/spec/requests/api/v1/cars_spec.rb
new file mode 100644
index 0000000..9506e50
--- /dev/null
+++ b/spec/requests/api/v1/cars_spec.rb
@@ -0,0 +1,7 @@
+require 'rails_helper'
+
+RSpec.describe 'API::V1::Cars', type: :request do
+  describe 'GET /index' do
+    pending "add some examples (or delete) #{__FILE__}"
+  end
+end