Is it possible to have just one entity in a session operating as a
dynamic-map, all other entities being mapped as POCO's? For example:
<class name="SomeNamespace.SomePOCO, SomeAssembly" >
<id>...</id>
<property>...</property>
<many-to-one name="ADictionary" entity-name="ADictionary"
></many-to-one>
</class>
<class entity-name="ADictionary>
<id>...</id>
<property>...</property>
</class>
public class SomePOCO {
public virtual int Id { get; protected set; }
public virtual IDictionary<string,object> ADictionary { get;
protected set; }
// etc
}
This is just R&D work at the moment, looking at different ways of
storing key-value data pairs associated with an entity. We've been
using a normalised EAV-style approach so far but want to compare it with
the denormalised "ultra wide table" approach for which a dynamic-map
seems ideally suited. A couple of attempts at this have produced some
interesting exceptions such as "System.InvalidCastException: Unable to
cast object of type 'NHibernate.Proxy.Map.MapProxy' to type
'System.Collections.Generic.IDictionary`2[System.String,System.Object]'"
; am I doing something wrong, or is this simply not a viable idea?
Thanks,
Pete
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