[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3301) Inconsistencies in association examples

[Peter Merker (JIRA)]

Inconsistencies in association examples
---------------------------------------

                 Key: HHH-3301
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3301
             Project: Hibernate3
          Issue Type: Improvement
          Components: documentation
         Environment: Doesn't matter
            Reporter: Peter Merker
            Priority: Minor


The examples for association mappings are inconsistent. For example, regarding bidirectional associations, it suffices to set the "unique" attribute in one of the two mapping files, as it is done in the code example for §7.5.1. The mapping file for "Address" doesn't contain any "unique" attribute (and thus can either represent a "one" or a "many" side). But in the example for §7.5.2. we see:

 <class name="Person">
    <id name="id" column="personId">
        <generator class="native"/>
    </id>
    <join table="PersonAddress"
        optional="true">
        <key column="personId"
            unique="true"/>  <!-- 1 -->
        <many-to-one name="address"
            column="addressId"
            not-null="true"
            unique="true"/>  <!-- 2 -->
    </join>
</class>

<class name="Address">
    <id name="id" column="addressId">
        <generator class="native"/>
    </id>
    <join table="PersonAddress"
        optional="true"
        inverse="true">
        <key column="addressId"
            unique="true"/>  <!-- 3 -->
        <many-to-one name="person"
            column="personId"
            not-null="true"
            unique="true"/>  <!-- 4 -->
    </join>
</class>

The occurrences marked with "3" and "4" are superfluous, I checked with hbm2ddl (adding class attributes to the many-to-ones). Even if you delete them, you always get 
"create table PersonAddress (personId integer not null unique, addressId integer not null unique, primary key (addressId));"

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