[IBATISNET-250] Nested resultMaps which inner has "groupBy" and outer not, gives System.NullReferenceException.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Affects Version/s: DataMapper 1.6.1
• Component/s: DataMapper
• Assignee: Unassigned
• Reporter: Emrah Akdag
• Created: 29/Nov/07 10:08
• Updated: 21/Mar/08 09:59
• Resolved: 21/Mar/08 09:59

Description

I am trying to use a resultmap (that has a "groupBy" clause) in another one (which has not a groupby). I am having NullRefereceException. The inner resultmap works alone.

In my project I am using a Photo class that has Tag list on it. There is a groupBy in Photo resultmap to avoid use N+1 selects. Photo resultmap works perfect. All the tags for one photo is on Tags property which is an IList. I am trying to make a new class that has a property of type Photo. When I tried to use nested resultmap, I am getting a NullRefereceException. Could you help me?

public class Photo {
public int Id;
public IList Tags;
}

public class Tag {
public int Id;
public string Name;
}

public class GroupPhoto {
public int Id;
public Photo Photo;
}

<resultMap id="PhotoResult" class="Photo" groupBy="Id">
<result property="Id" column="PHOTO_ID"/>
<result property="Tags" resultMapping="XXX.TagResult"/>
</resultMap>

<resultMap id="TagResult" class="Tag">
<result property="Id" column="TAG_ID"/>
<result property="Name" column="TAG_NAME"/>
</resultMap>

<resultMap id="GroupResult" class="GroupPhoto">
<result property="Id" column="GUI_ID"/>
<result property="Photo" resultMapping="XXX.PhotoResult"/>
</resultMap>