[Resolves #2] 기본 도메인 모델 작성

src/main/java/oncoding/concoder/model/Category.java

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+package oncoding.concoder.model;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.validation.constraints.NotNull;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Entity
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class Category extends JpaBaseEntity {
+    @Column
+    @NotNull
+    private String name;
+}

src/main/java/oncoding/concoder/model/JpaBaseEntity.java

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+package oncoding.concoder.model;
+
+import java.util.UUID;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.MappedSuperclass;
+import lombok.Getter;
+
+@Getter
+@MappedSuperclass
+public class JpaBaseEntity {
+    @Id
+    @GeneratedValue
+    private UUID id;
+}

src/main/java/oncoding/concoder/model/Level.java

@@ -0,0 +1,17 @@
+package oncoding.concoder.model;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.validation.constraints.NotNull;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Entity
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class Level extends JpaBaseEntity {
+    @Column
+    @NotNull
+    private String name;
+}

src/main/java/oncoding/concoder/model/Problem.java

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+package oncoding.concoder.model;
+
+import java.util.ArrayList;
+import java.util.List;
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.FetchType;
+import javax.persistence.ManyToOne;
+import javax.persistence.OneToMany;
+import javax.validation.constraints.NotNull;
+
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Entity
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class Problem extends JpaBaseEntity {
+    @Column(unique = true)
+    @NotNull
+    private Integer number;
+
+    @Column
+    @NotNull
+    private String title;
+
+    @Column
+    private Float rate;
+
+    @Column
+    @NotNull
+    private String content;
+
+    @ManyToOne(fetch = FetchType.EAGER)
+    private Level level;
+
+    @OneToMany(fetch = FetchType.EAGER, mappedBy = "problem")
+    private List<ProblemCategory> categories = new ArrayList<>();
+
+}

src/main/java/oncoding/concoder/model/ProblemCategory.java

@@ -0,0 +1,18 @@
+package oncoding.concoder.model;
+
+import javax.persistence.Entity;
+import javax.persistence.ManyToOne;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Entity
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class ProblemCategory extends JpaBaseEntity {
+    @ManyToOne
+    private Problem problem;
+
+    @ManyToOne
+    private Category category;
+}

src/main/java/oncoding/concoder/repository/CategoryRepository.java

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+package oncoding.concoder.repository;
+
+import java.util.UUID;
+import oncoding.concoder.model.Category;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface CategoryRepository extends JpaRepository<Category, UUID> {
+
+}

src/main/java/oncoding/concoder/repository/LevelRepository.java

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+package oncoding.concoder.repository;
+
+import java.util.UUID;
+import oncoding.concoder.model.Level;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface LevelRepository extends JpaRepository<Level, UUID> {
+
+}

src/main/java/oncoding/concoder/repository/ProblemCategoryRepository.java

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+package oncoding.concoder.repository;
+
+import java.util.UUID;
+import oncoding.concoder.model.ProblemCategory;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ProblemCategoryRepository extends JpaRepository<ProblemCategory, UUID> {
+
+}

src/main/java/oncoding/concoder/repository/ProblemRepository.java

@@ -0,0 +1,9 @@
+package oncoding.concoder.repository;
+
+import java.util.UUID;
+import oncoding.concoder.model.Problem;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ProblemRepository extends JpaRepository<Problem, UUID> {
+
+}