Implement car models

src/main/java/com/example/backend/car/controller/CarController.java

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+package com.example.backend.car.controller;
+
+import com.example.backend.car.dto.CarBrandDto;
+import com.example.backend.car.dto.CarModelDto;
+import com.example.backend.car.service.CarService;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/cars")
+public class CarController {
+
+    private final CarService carBrandService;
+
+    public CarController(CarService carBrandService) {
+        this.carBrandService = carBrandService;
+    }
+
+    @GetMapping("list")
+    public List<CarBrandDto> get() {
+        return carBrandService.list().stream().map((carBrand) -> CarBrandDto.of(carBrand.getId(), carBrand.getName(), carBrand.getSearchKey())).toList();
+    }
+
+    @GetMapping("/{brand_id}")
+    public List<CarModelDto> getModels(@PathVariable("brand_id") Integer brandId) {
+        return carBrandService.getModels(brandId).stream()
+            .map(carModel -> CarModelDto.of(
+                carModel.getId(),
+                carModel.getName(),
+                carModel.getSearchKey(),
+                carModel.getBrand().getId()
+            ))
+            .toList();
+    }
+}

src/main/java/com/example/backend/car/dto/CarModelDto.java

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+package com.example.backend.car.dto;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonInclude;
+
+@JsonInclude(JsonInclude.Include.NON_NULL)
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class CarModelDto {
+
+    private Integer id;
+
+    private String name;
+
+    private String searchKey;
+
+    private Integer brandId;
+
+    public static CarModelDto of(Integer id, String name, String searchKey, Integer brandId) {
+        CarModelDto carModelDto = new CarModelDto();
+        carModelDto.setId(id);
+        carModelDto.setName(name);
+        carModelDto.setSearchKey(searchKey);
+        carModelDto.setBrandId(brandId);
+        return carModelDto;
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getSearchKey() {
+        return searchKey;
+    }
+
+    public void setSearchKey(String searchKey) {
+        this.searchKey = searchKey;
+    }
+
+    public Integer getBrandId() {
+        return brandId;
+    }
+
+    public void setBrandId(Integer brandId) {
+        this.brandId = brandId;
+    }
+}

src/main/java/com/example/backend/car/model/CarModel.java

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+package com.example.backend.car.model;
+
+import jakarta.persistence.*;
+
+@Entity
+@Table(name = "car_model")
+public class CarModel {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private int id;
+
+    @Column(length = 64, nullable = false)
+    private String name;
+
+    @Column(length = 64, nullable = false)
+    private String searchKey;
+
+    @ManyToOne
+    @JoinColumn(name = "car_brand_id", referencedColumnName = "id", nullable = false)
+    private CarBrand brand;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) { 
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getSearchKey() {
+        return searchKey;
+    }
+
+    public void setSearchKey(String searchKey) {
+        this.searchKey = searchKey;
+    }
+
+    public CarBrand getBrand() {
+        return brand;
+    }
+
+    public void setBrand(CarBrand brand) {
+        this.brand = brand;
+    }
+}

src/main/java/com/example/backend/car/repository/CarModelRepository.java

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+package com.example.backend.car.repository;
+
+import com.example.backend.car.model.CarModel;
+
+import java.util.List;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface CarModelRepository extends JpaRepository<CarModel, Integer> {
+
+    List<CarModel> findAllByBrandIdOrderByNameAsc(Integer brandId);
+
+}

src/main/java/com/example/backend/car/service/CarService.java

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+package com.example.backend.car.service;
+
+import com.example.backend.car.model.CarBrand;
+import com.example.backend.car.model.CarModel;
+import com.example.backend.car.repository.CarBrandRepository;
+import com.example.backend.car.repository.CarModelRepository;
+
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class CarService {
+
+    private final CarBrandRepository carBrandRepository;
+
+    private final CarModelRepository carModelRepository;
+
+    public CarService(CarBrandRepository carBrandRepository, CarModelRepository carModelRepository) {
+        this.carBrandRepository = carBrandRepository;
+        this.carModelRepository = carModelRepository;
+    }
+
+    public List<CarBrand> list() {
+        return carBrandRepository.findAllByOrderByNameAsc();
+    }
+
+    public List<CarModel> getModels(Integer brandId) {
+        return carModelRepository.findAllByBrandIdOrderByNameAsc(brandId);
+    }
+
+}