[英]AutoMapper error: class maps to a datatype (byte[])
I have two classes, each having a domain and a repo version. 我有两个类,每个类都有一个域和一个仓库版本。
DOMAIN: 域:
public class MusicInfo
{
public string Id { get; set; }
public MusicImage Image { get; set; }
public MusicInfo(byte[] image)
{
this.Image = new MusicImage(this, image);
}
}
public class MusicImage
{
public byte[] Blob { get; set; }
public MusicInfo MusicInfo { get; set; }
public string Id { get; set; }
public MusicImage(MusicInfo musicInfo, byte[] blob)
{
if (musicInfo == null)
throw new ArgumentNullException("musicInfo");
if (blob == null)
throw new ArgumentNullException("blob");
this.MusicInfo = musiscInfo;
this.Blob = blob;
}
}
REPO: 回购:
public class MusicInfoRepo
{
public virtual long Id { get; set; }
public virtual MusicImageRepo Image { get; set; }
}
public class MusicImageRepo
{
public virtual byte[] Blob { get; set; }
public virtual MusicInfoRepo MusicInfo { get; set; }
public virtual long Id { get; set; }
}
And here are their mappings: 这是他们的映射:
public class MusicInfoRepoMap : HighLowClassMapping<MusicInfoRepo>
{
public MusicInfoRepoMap()
{
Table("MusicInfo");
Id(f => f.Id, m => m.Generator(Generators.HighLow, HighLowMapper));
OneToOne(f => f.Image, m => m.Cascade(Cascade.All));
}
}
public class MusicImageRepoMap : ClassMapping<MusicImageRepo>
{
public MusicImageRepoMap()
{
Table("MusicImage");
Id(f => f.Id, m => m.Generator(Generators.Foreign<MusicImageRepo>(f => f.MusicInfo)));
Property(f => f.Blob, m =>
{
m.NotNullable(true);
m.Column(c => c.SqlType("VARBINARY(MAX)"));
m.Length(Int32.MaxValue);
m.Update(false);
});
OneToOne(f => f.MusicInfo,
m =>
{
m.Cascade(Cascade.None);
m.Constrained(true);
m.Lazy(LazyRelation.NoLazy);
});
}
}
When I am trying to query for a ClassA that has a one to one relationship with ClassB which also has a one to one relationship with MusicInfo, an error occurs that says: 当我尝试查询与ClassB具有一对一关系且与MusicInfo具有一对一关系的ClassA时,发生错误,提示:
Missing type map configuration or unsupported mapping.
Mapping types:
MusicImageRepo -> Byte[]
Blah.MusicImageRepo -> System.Byte[]
Destination path:
List`1[0]
Source value:
Blah.MusicImageRepo
but here is how i map them: 但是这是我如何映射它们:
Mapper.CreateMap<MusicInfo, MusicInfoRepo>();
Mapper.CreateMap<MusicInfoRepo, MusicInfo>();
Mapper.CreateMap<MusicImage, MusicImageRepo>();
Mapper.CreateMap<MusicImageRepo, MusicImage>();
There are no problems when saving these classes. 保存这些类时没有问题。 I really dont get why the error happens.
我真的不明白为什么会发生错误。 Will really appreciate your help.
会非常感谢您的帮助。
OneToOne says that the other entity/table has the Reference(column). OneToOne表示另一个实体/表具有引用(列)。 It should not work when both sides have a onetoone mapping since they bounce the responsiblity back and forth.
当双方都具有一对一的映射时,它不起作用,因为它们来回地反弹责任。
Also the classes look a bit overcomplicated when all you need is to store the bytes somewhere else. 当您只需要将字节存储在其他位置时,这些类看起来也会有些复杂。
public class MusicInfoRepo
{
public virtual long Id { get; private set; }
public virtual MusicImageRepo Image { get; private set; }
public MusicInfo(byte[] image)
{
this.Image = new MusicImageRepo(this, image);
}
}
public class MusicImageRepo
{
public virtual MusicInfoRepo MusicInfo { get; private set; }
public virtual byte[] Blob { get; set; }
}
public class MusicInfoRepoMap : HighLowClassMapping<MusicInfoRepo>
{
public MusicInfoRepoMap()
{
Table("MusicInfo");
Id(f => f.Id, m => m.Generator(Generators.HighLow, HighLowMapper));
OneToOne(f => f.Image, m => m.Cascade(Cascade.All));
}
}
public class MusicImageRepoMap : ClassMapping<MusicImageRepo>
{
public MusicImageRepoMap()
{
Table("MusicImage");
ComposedId(m => m.ManyToOne(x => x.MusicInfo));
Property(f => f.Blob, m =>
{
m.NotNullable(true);
m.Column(c => c.SqlType("VARBINARY(MAX)"));
m.Length(Int32.MaxValue);
m.Update(false);
});
}
}
Note: think about it if the seperation between DomainModel and MappedModel really makes sense. 注意:如果DomainModel和MappedModel之间的分隔确实有意义,请考虑一下。 NHibernate goes to great length supporting mapping of DomainModels.
NHibernate竭尽全力支持DomainModels的映射。
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