Added another test case for #215. The association element in the authorResult does not have columnPrefix attribute, so MyBatis tries to lookup ancestor stored under the same resultMapID.

Author: harawata

src/test/java/org/apache/ibatis/submitted/ancestor_ref/AncestorRefTest.java

@@ -73,4 +73,20 @@ public void testCircularCollection() {
       sqlSession.close();
     }
   }
+
+  @Test
+  public void testAncestorRef() {
+    SqlSession sqlSession = sqlSessionFactory.openSession();
+    try {
+      Mapper mapper = sqlSession.getMapper(Mapper.class);
+      Blog blog = mapper.selectBlog(1);
+      assertEquals("Author1", blog.getAuthor().getName());
+      assertEquals("Author2", blog.getCoAuthor().getName());
+      // author and coauthor should have a ref to blog
+      assertEquals(blog, blog.getAuthor().getBlog());
+      assertEquals(blog, blog.getCoAuthor().getBlog());
+    } finally {
+      sqlSession.close();
+    }
+  }
 }

src/test/java/org/apache/ibatis/submitted/ancestor_ref/Author.java

@@ -0,0 +1,47 @@
+/**
+ *    Copyright 2009-2016 the original author or authors.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+package org.apache.ibatis.submitted.ancestor_ref;
+
+public class Author {
+  private Integer id;
+  private String name;
+  private Blog blog;
+
+  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 Blog getBlog() {
+    return blog;
+  }
+
+  public void setBlog(Blog blog) {
+    this.blog = blog;
+  }
+}

src/test/java/org/apache/ibatis/submitted/ancestor_ref/Blog.java

@@ -0,0 +1,56 @@
+/**
+ *    Copyright 2009-2016 the original author or authors.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+package org.apache.ibatis.submitted.ancestor_ref;
+
+public class Blog {
+  private Integer id;
+  private String title;
+  private Author author;
+  private Author coAuthor;
+
+  public Integer getId() {
+    return id;
+  }
+
+  public void setId(Integer id) {
+    this.id = id;
+  }
+
+  public String getTitle() {
+    return title;
+  }
+
+  public void setTitle(String title) {
+    this.title = title;
+  }
+
+  public Author getAuthor() {
+    return author;
+  }
+
+  public void setAuthor(Author author) {
+    this.author = author;
+  }
+
+  public Author getCoAuthor() {
+    return coAuthor;
+  }
+
+  public void setCoAuthor(Author coAuthor) {
+    this.coAuthor = coAuthor;
+  }
+}

src/test/java/org/apache/ibatis/submitted/ancestor_ref/CreateDB.sql

@@ -32,3 +32,24 @@ insert into users (id, name) values
 
 insert into friend (user_id, friend_id) values
 (1, 2), (2, 2), (2, 3);
+
+drop table blog if exists;
+drop table author if exists;
+
+create table blog (
+  id int,
+  title varchar(16),
+  author_id int,
+  co_author_id int
+);
+
+create table author (
+  id int,
+  name varchar(16)
+);
+
+insert into blog (id, title, author_id, co_author_id) values
+(1, 'Blog1', 1, 2), (2, 'Blog2', 2, 3);
+
+insert into author (id, name) values
+(1, 'Author1'), (2, 'Author2'), (3, 'Author3');

src/test/java/org/apache/ibatis/submitted/ancestor_ref/Mapper.java

@@ -19,5 +19,6 @@ public interface Mapper {
 
   User getUserAssociation(Integer id);
   User getUserCollection(Integer id);
+  Blog selectBlog(Integer id);
 
 }

src/test/java/org/apache/ibatis/submitted/ancestor_ref/Mapper.xml

@@ -55,4 +55,30 @@
     order by uf.id
   </select>
 
+  <resultMap type="org.apache.ibatis.submitted.ancestor_ref.Blog"
+    id="blogResult">
+    <id property="id" column="id" />
+    <result property="title" column="title" />
+    <association property="author" resultMap="authorResult"
+      columnPrefix="author_" />
+    <association property="coAuthor" resultMap="authorResult"
+      columnPrefix="co_author_" />
+  </resultMap>
+
+  <resultMap type="org.apache.ibatis.submitted.ancestor_ref.Author"
+    id="authorResult">
+    <id property="id" column="id" />
+    <result property="name" column="name" />
+    <association property="blog" resultMap="blogResult" />
+  </resultMap>
+
+  <select id="selectBlog" resultMap="blogResult"><![CDATA[
+    select id, title, a.id author_id, a.name author_name,
+      ca.id co_author_id, ca.name co_author_name
+    from blog b
+    left join author a on a.id = b.author_id
+    left join author ca on ca.id = b.co_author_id
+    where b.id = #{id}
+  ]]></select>
+
 </mapper>