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composite-element / many-to-one problem

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Dio

Post subject: composite-element / many-to-one problem

Posted: Fri Sep 16, 2005 4:42 am

Good day!

I've implemented the following mapping

Code:

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">
  <class name="Company" table="COMPANY">

    <!-- ... -->

    <set name="Addresses" cascade="all" table="COMPANY_ADDRESS">
      <key column="COMPANY_ID"/>
      <composite-element class="Address">

        <!-- Doesn't seem to work -->
        <many-to-one name="State" column="STATE_ID"/>

        <property name="City" column="CITY"/>
        <property name="Street1" column="STREET"/>
        <property name="Zip" column="ZIP"/>
       </composite-element>
    </set>
  
    <!-- ... -->

  </class>
</hibernate-mapping>

(Source: http://www.hibernate.org/hib_docs/v3/reference/en/html/components.html#components-incollections)

Implementation of State class is trivial. Data model relations are fine (all required foreign/primary keys are present).

But that mapping doesn't seem to work. I know that problem in <many-to-one> element inside <composite-element> (it works fine without it). I though that NHibernate supports such those elements nested that way. What will you suggest?

Any help will be surely appreciated.

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sergey

Post subject:

Posted: Fri Sep 16, 2005 5:13 am

Contributor

Joined: Wed May 11, 2005 4:59 pm
Posts: 1766
Location: Prague, Czech Republic

What exactly does not work?

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Dio

Post subject:

Posted: Fri Sep 16, 2005 10:44 am

sergey wrote:

What exactly does not work?

Sorry :oops: . I got over the last error so let me proceed with the next one appeared.

The extraction of Company object seems to work fine. Addresses are extracted normaly as well.

After that I alter one of the addresses by altering the State property.

When I call ISession.SaveOrUpdate(Company) I expect that altered address will be updated in COMPANY_ADDRESS table. Instead NHibernate just creates copy of that address with altered State property, no updation occurs.

Any ideas?

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sergey

Post subject:

Posted: Fri Sep 16, 2005 1:20 pm

Contributor

Joined: Wed May 11, 2005 4:59 pm
Posts: 1766
Location: Prague, Czech Republic

You probably didn't override Equals and GetHashCode for Address.

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Dio

Post subject:

Posted: Mon Sep 19, 2005 3:06 am

sergey wrote:

You probably didn't override Equals and GetHashCode for Address.

Thanks, but that is not the case, I guess. I've overriden those methods but it didn't helped.

It worked fine without Equals() and GetHashCode() when the State was stored/mapped as plain string.

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sergey

Post subject:

Posted: Mon Sep 19, 2005 3:40 am

Contributor

Joined: Wed May 11, 2005 4:59 pm
Posts: 1766
Location: Prague, Czech Republic

Ok, please show the mappings for your classes and the code that is causing the problem.

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Dio

Post subject:

Posted: Mon Sep 19, 2005 4:11 am

Before I do so... I've noticed that insertion occurs only if there are some fields with null values, e.g no State was specified before I edit the address. If all the fiedls have not null values before edit then the sequential update occurs normaly.

Why does NHibernate treats null-fields in <set> so specificly?

P.S. Thanks for your support though I'm such a dummy in ORM.

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