c# - NHibernate: Stateful and Stateless sessions need different mappings -

i'm using fluent nhibernate read , write files. @ moment, have parent-child relationship, mappings defined by

public class parentmappings: classmap<parent> {     public parentmappings()     {         table("parent");         id(x => x.id).column("parent_id");         ...          hasmany(x => x.children)             .not.keynullable()             .not.inverse()             .keycolumn("parent_id")             .cascade.all();          ...     } } 

and

public class childmappings : classmap<child> {     public childmappings()     {         table("child");         id(x => x.id).column("child_id");          map(x => x.parentid).column("parent_id");         ...     } } 

here problem. want able write parent/child table stateless session, preserve speed, read table stateful session, children collection gets loaded correctly. however, seems 2 approaches incompatible. call hasmany() breaks statless write; removing breaks stateful read.

in wider context, there may instances i'll want write database using stateful session. in case inclusion of map(x => x.parentid).column("parent_id") statement breaks stateful write.

it looks though i'll need use different mappings stateful , stateless sessions. however, i'm new nhibernate, , can't see obvious way @ stage. can suggest way this, or equivalent workaround?

you have mapped backreference parent in child should reference not id alone. change to

// in childmap reference(x => x.parent).column("parent_id"); 

and can set inverse enhance performance

// in parentmap hasmany(x => x.children)         .not.keynullable()         .inverse()         .keycolumn("parent_id")         .cascade.all(); 

then hasmany , map(x => x.parentid) not collide anymore in stateful session