BaseEntity.java

package com.sprint.mission.discodeit.base;

import jakarta.persistence.Column;
import jakarta.persistence.EntityListeners;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.GenerationType;
import jakarta.persistence.Id;
import jakarta.persistence.MappedSuperclass;
import java.time.Instant;
import java.util.UUID;
import lombok.AccessLevel;
import lombok.Getter;
import lombok.NoArgsConstructor;
import org.springframework.data.annotation.CreatedDate;
import org.springframework.data.jpa.domain.support.AuditingEntityListener;

@Getter
@NoArgsConstructor(access = AccessLevel.PROTECTED)
@MappedSuperclass
@EntityListeners(AuditingEntityListener.class)
public abstract class BaseEntity {

  @Id
  @GeneratedValue(strategy = GenerationType.UUID)
  protected UUID id;

  @CreatedDate
  @Column(nullable = false, updatable = false)
  protected Instant createdAt;

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    return id.equals(((BaseEntity) obj).id);
  }

  @Override
  public int hashCode() {
    return id.hashCode();
  }
}