nhibernate inheritance mapping issue -

i changed relationship between party & partyname uni-directional, , tests pass now.

but have question final test output:

when test saves student, inserts party, inserts cascading relationship partyname. great.

at end when fetches student, final select.

but right before final select , right after initial insert partyname update:

nhibernate:  update partynames set therequiredname = @p0, everythingelse = @p1, contextused = @p2, salutation = @p3, effectivestart = @p4, effectiveend = @p5  partynameid = @p6;@p0 = 'hesh' [type: string (0)], @p1 = 'berryl;;;' [type: string (0)], @p2 = 'student' [type: string (0)], @p3 = null [type: string (0)], @p4 = null [type: datetime (0)], @p5 = null [type: datetime (0)], @p6 = 65536 [type: int32 (0)] 

i don't follow why doing that. triggering update?

cheers,
berryl

mapping

 <class name="party" table="parties"> <id name="id">   <column name="partyid" />   <generator class="hilo" /> </id>  <discriminator column="type" not-null="true" type="string" />  <set access="field.camelcase-underscore" cascade="all" inverse="true" name="names">   <key foreign-key="party_partyname_fk">     <column name="partynameid" />   </key>   <one-to-many class="parties.domain.names.partyname, parties.domain" /> </set>  <subclass    name="student, core.testingsupport"    discriminator-value="student"   >   <property name="number" />    <many-to-one      class="course, core.testingsupport"      foreign-key="course_fk"      name="course">     <column name="somedopeyclassid" index="courseindex" />   </many-to-one> </subclass> 

<property name="therequiredname" not-null="true" length="50"/> <property name="everythingelse" /> <property name="contextused" length="50"/> <property name="salutation" length="20"/> <property name="effectiveperiod" type="core.data.nhibernate.usertypes.daterangeusertype, core.data">   <column name="effectivestart"/>   <column name="effectiveend"/> </property> 

object model code

public class party : entity {                ...      /// <summary>one or more optional names.</summary>     public virtual ienumerable<partyname> names { { return _names; } }      private readonly icollection<partyname> _names = new hashset<partyname>();      public virtual void addpartyname(partyname partyname)     {         if (partyname == null) throw new argumentnullexception("partyname");          _names.add(partyname);     }      public virtual bool removepartyname(partyname partyname)     {         if (partyname == null) throw new argumentnullexception("partyname");          return _names.remove(partyname);     }      }  public class student : party {     private const string _context = "student";      public virtual personname studentname {         { return (personname)this.getnameforcontextof(_context); }          set { this.setpartyname(value, _context); }     }      ... }  public static class partynameextensions {     public static void setpartyname(this party party, personname personname, string contextused) {         if (party == null) throw new argumentnullexception("party");         if (string.isnullorwhitespace(contextused)) throw new argumentnullexception("contextused");          var found = party.getnameforcontextof(contextused);         if (personname == null)         {             if (found != null) party.removepartyname(found);         }         else {             if (found == null)             {                 var partyname = (partyname)personname;                 partyname.contextused = contextused;                 party.addpartyname(partyname);             }         }     }      public static partyname getnameforcontextof(this party party, string contextused) {         if (party == null) throw new argumentnullexception("party");         if (string.isnullorempty(contextused)) throw new argumentnullexception("contextused");          return party.names.singleordefault(x => x.contextused == contextused);     } } 

passing test (and output)

    [test] public void cansaveandload_names() {     _student = new student { studentname = nameseeds.devpersonname, };     using (var tx = _session.begintransaction())     {         _session.save(_student);         tx.commit();     }     _session.clear();      student foundstudent;     using (var tx = _session.begintransaction())     {         foundstudent = _session.get<student>(_student.id);         tx.commit();     }     assert.that(_student.studentname, is.equalto(nameseeds.devpersonname)); } 

output

nhibernate: select next_hi hibernate_unique_key nhibernate: update hibernate_unique_key set next_hi = @p0 next_hi = @p1;@p0 = 2 [type: int32 (0)], @p1 = 1 [type: int32 (0)] nhibernate: select next_hi hibernate_unique_key nhibernate: update hibernate_unique_key set next_hi = @p0 next_hi = @p1;@p0 = 3 [type: int32 (0)], @p1 = 2 [type: int32 (0)] nhibernate: insert parties (number, courseid, type, partyid) values (@p0, @p1, 'student', @p2);@p0 = 0 [type: int32 (0)], @p1 = null [type: int32 (0)], @p2 = 32768 [type: int32 (0)] nhibernate: insert partynames (therequiredname, everythingelse, contextused, salutation, effectivestart, effectiveend, partynameid) values (@p0, @p1, @p2, @p3, @p4, @p5, @p6);@p0 = 'hesh' [type: string (0)], @p1 = 'berryl;;;' [type: string (0)], @p2 = 'student' [type: string (0)], @p3 = null [type: string (0)], @p4 = null [type: datetime (0)], @p5 = null [type: datetime (0)], @p6 = 65536 [type: int32 (0)] nhibernate: update partynames set therequiredname = @p0, everythingelse = @p1, contextused = @p2, salutation = @p3, effectivestart = @p4, effectiveend = @p5 partynameid = @p6;@p0 = 'hesh' [type: string (0)], @p1 = 'berryl;;;' [type: string (0)], @p2 = 'student' [type: string (0)], @p3 = null [type: string (0)], @p4 = null [type: datetime (0)], @p5 = null [type: datetime (0)], @p6 = 65536 [type: int32 (0)] nhibernate: select student0_.partyid partyid2_0_, student0_.number number2_0_, student0_.courseid somedope4_2_0_ parties student0_ student0_.partyid=@p0 , student0_.type='student';@p0 = 32768 [type: int32 (0)]