NHibernate transient object exception

Question

I want make an insert in the table EmployeebyProject, when try to insert throw the transient object exception.

Table EmployeebyProject : {PK: EmployeeId, PK: ProjectId, DateBegin, DateEnd}

This is the mapping:

<composite-id>
  <key-many-to-one name="Project" column="ProjectId" class="Project" cascade="save"></key-many-to-one>
  <key-many-to-one name="Employee" column="EmployeeId" class="Employee"></key-many-to-one>
</composite-id>

<property name="DateBegin" type="DateTime"/>
<property name="DateEnd" type="DateTime"/>

enter code here

How can avoid this problem?

roufamatic · Accepted Answer · 2012-02-14 18:41:01Z

1

Object from hibernate perspective can be in several states - transient, attached, detached ... Transient means entity that wasnt saved to the database yet. If i have relation A->B you need to save B in order to save A (because hibernate need to know what to put in A foreign key to B).

So 2 options:

save B before. In your case Project, Employee
put cascade . In your case you missing cascade on Employee

edited Feb 14, 2012 at 18:41

roufamatic

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answered Jul 19, 2011 at 21:19

Avihai Marchiano

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