diff --git a/build.gradle b/build.gradle
index f5e17b9..4b8eb6f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -13,7 +13,6 @@ buildscript {
 apply plugin: 'java'
 apply plugin: 'eclipse'
 apply plugin: 'idea'
-apply plugin: 'findbugs'
 apply plugin: 'org.springframework.boot'
 
 version = '0.0.1-SNAPSHOT'
diff --git a/src/main/resources/mapper/ArticleReadService.xml b/src/main/resources/mapper/ArticleReadService.xml
index 822c2b1..cde823b 100644
--- a/src/main/resources/mapper/ArticleReadService.xml
+++ b/src/main/resources/mapper/ArticleReadService.xml
@@ -41,15 +41,17 @@
         left join article_tags AT on A.id = AT.article_id
         left join tags T on T.id = AT.tag_id
         left join article_favorites AF on AF.article_id = A.id
+        left join users AU on AU.id = A.user_id
+        left join users AFU on AFU.id = AF.user_id
         <where>
             <if test="tag != null">
                 T.name = #{tag}
             </if>
             <if test="author != null">
-                AND A.user_id = #{author}
+                AND AU.username = #{author}
             </if>
             <if test="favoritedBy != null">
-                AND AF.user_id = #{favoritedBy}
+                AND AFU.username = #{favoritedBy}
             </if>
         </where>
         order by A.created_at desc
@@ -63,15 +65,17 @@
         left join article_tags AT on A.id = AT.article_id
         left join tags T on T.id = AT.tag_id
         left join article_favorites AF on AF.article_id = A.id
+        left join users AU on AU.id = A.user_id
+        left join users AFU on AFU.id = AF.user_id
         <where>
             <if test="tag != null">
                 T.name = #{tag}
             </if>
             <if test="author != null">
-                AND A.user_id = #{author}
+                AND AU.username = #{author}
             </if>
             <if test="favoritedBy != null">
-                AND AF.user_id = #{favoritedBy}
+                AND AFU.username = #{favoritedBy}
             </if>
         </where>
     </select>
diff --git a/src/test/java/io/spring/application/article/ArticleQueryServiceTest.java b/src/test/java/io/spring/application/article/ArticleQueryServiceTest.java
index fccec10..e61acd2 100644
--- a/src/test/java/io/spring/application/article/ArticleQueryServiceTest.java
+++ b/src/test/java/io/spring/application/article/ArticleQueryServiceTest.java
@@ -107,7 +107,7 @@ public class ArticleQueryServiceTest {
         Article anotherArticle = new Article("new article", "desc", "body", new String[]{"test"}, anotherUser.getId());
         articleRepository.save(anotherArticle);
 
-        ArticleDataList recentArticles = queryService.findRecentArticles(null, user.getId(), null, new Page(), user);
+        ArticleDataList recentArticles = queryService.findRecentArticles(null, user.getUsername(), null, new Page(), user);
         assertThat(recentArticles.getArticleDatas().size(), is(1));
         assertThat(recentArticles.getCount(), is(1));
     }
@@ -123,7 +123,7 @@ public class ArticleQueryServiceTest {
         ArticleFavorite articleFavorite = new ArticleFavorite(article.getId(), anotherUser.getId());
         articleFavoriteRepository.save(articleFavorite);
 
-        ArticleDataList recentArticles = queryService.findRecentArticles(null, null, anotherUser.getId(), new Page(), anotherUser);
+        ArticleDataList recentArticles = queryService.findRecentArticles(null, null, anotherUser.getUsername(), new Page(), anotherUser);
         assertThat(recentArticles.getArticleDatas().size(), is(1));
         assertThat(recentArticles.getCount(), is(1));
         ArticleData articleData = recentArticles.getArticleDatas().get(0);