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POMapping a struct as Id in nhibernate
 

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  1. POMapping a struct as Id in nhibernate
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    <p>I have the following struct and class:</p> <pre><code>public struct DepartmentId{ public int Value {get; set;} } public class Department{ public virtual DepartmentId Id{get;set;} public virtual string Name {get; set;} } </code></pre> <p>I created a mapping file for Department as follows:</p> <pre><code>public class DepartmentMapping : ClassMapping&lt;Department&gt;{ public DepartmentMapping{ Table("Department"); Id(dept =&gt; dept.Id, mapper =&gt; { mapper.Column("Id"); mapper.Type(new DepartmentIdType()); }); Property(dept =&gt; dept.Name, mapper =&gt; mapper.Column("Name")); } } </code></pre> <p>where DepartmentIdType implements IIdentifierType:</p> <pre><code>class DepartmentIdType : PrimitiveType, IIdentifierType { public DepartmentIdType() : base(SqlTypeFactory.Int32) { } public override object DeepCopy(object val, EntityMode entityMode, ISessionFactoryImplementor factory) { return val; } public override object Replace(object original, object current, ISessionImplementor session, object owner, IDictionary copiedAlready) { return original; } public override Type ReturnedClass { get { return typeof(DepartmentId); } } public object StringToObject(string xml) { return new DepartmentId {Value = int.Parse(xml)}; } public override string Name { get { return typeof(DepartmentId).Name; } } public override void Set(IDbCommand cmd, object value, int index) { var id = (DepartmentId) value; ((IDataParameter) cmd.Parameters[index]).Value = id.Value; } public override object Get(IDataReader rs, int index) { int value = rs.GetInt32(index); return new DepartmentId {Value = value}; } public override object Get(IDataReader rs, string name) { return Get(rs, rs.GetOrdinal(name)); } public override string ToString(object val) { if (val == null) return ""; return val.ToString(); } public override object FromStringValue(string xml) { return new DepartmentId {Value = Int32.Parse(xml)}; } public override object DefaultValue { get { return new DepartmentId {Value = 0}; } } public override string ObjectToSQLString(object value, NHibernate.Dialect.Dialect dialect) { return value.ToString(); } public override Type PrimitiveClass { get { return typeof(DepartmentId); } } } </code></pre> <p>However, at the time of creating the HbmMapping, I get the following error:</p> <pre><code>Could not compile the mapping document: mapping_by_code NHibernate.MappingException: Could not compile the mapping document: mapping_by_code ---&gt; NHibernate.MappingException: Could not determine type for: Demo.Models.DepartmentId, Demo.Models, for columns: NHibernate.Mapping.Column(Id) at NHibernate.Mapping.SimpleValue.get_Type() at NHibernate.Cfg.XmlHbmBinding.ClassIdBinder.CreateIdentifierProperty(HbmId idSchema, PersistentClass rootClass, SimpleValue id) at NHibernate.Cfg.XmlHbmBinding.ClassIdBinder.BindId(HbmId idSchema, PersistentClass rootClass, Table table) at NHibernate.Cfg.XmlHbmBinding.RootClassBinder.Bind(HbmClass classSchema, IDictionary`2 inheritedMetas) at NHibernate.Cfg.XmlHbmBinding.MappingRootBinder.AddRootClasses(HbmClass rootClass, IDictionary`2 inheritedMetas) at NHibernate.Cfg.XmlHbmBinding.MappingRootBinder.AddEntitiesMappings(HbmMapping mappingSchema, IDictionary`2 inheritedMetas) at NHibernate.Cfg.XmlHbmBinding.MappingRootBinder.Bind(HbmMapping mappingSchema) at NHibernate.Cfg.Configuration.AddDeserializedMapping(HbmMapping mappingDocument, String documentFileName) </code></pre> <p>How do I fix this issue (without changing DepartmentId from struct to class)?</p> <p>Thanks in advance for your help.</p>
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