Nested resultMaps which inner has "groupBy" and outer not, gives
System.NullReferenceException.
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Key: IBATISNET-250
URL: https://issues.apache.org/jira/browse/IBATISNET-250
Project: iBatis for .NET
Issue Type: Bug
Components: DataMapper
Affects Versions: DataMapper 1.6.1
Reporter: Emrah Akdag
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>
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