fix: 评论发表校验

src/main/java/io/github/xxyopen/novel/core/common/constant/ErrorCodeEnum.java

@@ -82,6 +82,16 @@ public enum ErrorCodeEnum {
      * */
     USER_UN_AUTH("A0301","访问未授权"),
 
+    /**
+     * 用户评论异常
+     * */
+    USER_COMMENT("A2000","用户评论异常"),
+
+    /**
+     * 用户评论异常
+     * */
+    USER_COMMENTED("A2001","用户已发表评论"),
+
     /**
      * 一级宏观错误码，系统执行出错
      * */

src/main/java/io/github/xxyopen/novel/core/constant/DatabaseConsts.java

@@ -136,6 +136,8 @@ public class DatabaseConsts {
 
         public static final String COLUMN_BOOK_ID = "book_id";
 
+        public static final String COLUMN_USER_ID = "user_id";
+
     }
 
     /**

src/main/java/io/github/xxyopen/novel/dto/req/UserCommentReqDto.java

@@ -1,6 +1,7 @@
 package io.github.xxyopen.novel.dto.req;
 
 import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
 import lombok.Data;
 import org.hibernate.validator.constraints.Length;
 
@@ -14,7 +15,7 @@ public class UserCommentReqDto {
 
     private Long userId;
 
-    @NotBlank(message="小说ID不能为空！")
+    @NotNull(message="小说ID不能为空！")
     private Long bookId;
 
     @NotBlank(message="评论不能为空！")

src/main/java/io/github/xxyopen/novel/service/impl/BookServiceImpl.java

@@ -2,6 +2,7 @@ package io.github.xxyopen.novel.service.impl;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import io.github.xxyopen.novel.core.common.constant.ErrorCodeEnum;
 import io.github.xxyopen.novel.core.common.resp.PageRespDto;
 import io.github.xxyopen.novel.core.common.resp.RestResp;
 import io.github.xxyopen.novel.core.constant.DatabaseConsts;
@@ -206,6 +207,14 @@ public class BookServiceImpl implements BookService {
 
     @Override
     public RestResp<Void> saveComment(UserCommentReqDto dto) {
+        // 校验用户是否已发表评论
+        QueryWrapper<BookComment> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq(DatabaseConsts.BookCommentTable.COLUMN_USER_ID,dto.getUserId())
+                .eq(DatabaseConsts.BookCommentTable.COLUMN_BOOK_ID,dto.getBookId());
+        if(bookCommentMapper.selectCount(queryWrapper) > 0){
+            // 用户已发表评论
+            return RestResp.fail(ErrorCodeEnum.USER_COMMENTED);
+        }
         BookComment bookComment = new BookComment();
         bookComment.setBookId(dto.getBookId());
         bookComment.setUserId(dto.getUserId());