internationalization - Why NHibernate returns multiple results from one database row? -

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i have translation engine mapped follows:

<class name="core.model.entities.translation, core.model" table="translation" lazy="false"> <id name="id" column="id" type="int64">   <generator class="native" /> </id> <map name="translations" table="translation_value" inverse="true" fetch="join" cascade="all-delete-orphan" lazy="false">   <key column="translation_id" />   <index-many-to-many column="language_id" class="core.model.entities.language, core.model"/>   <one-to-many class="core.model.entities.translationvalue, core.model"/> </map> </class>   <class name="core.model.entities.translationvalue, core.model" table="translation_value" lazy="false"> <id name="id" column="id" type="int64">   <generator class="native" /> </id> <property name="value" column="value" type="string"/> <many-to-one name="translation" column="translation_id" class="core.model.entities.translation, core" not-null="true"/> <many-to-one name="language" column="language_id" class="core.model.entities.language, core" not-null="true" />

example "item" class uses translations that:

<class name="core.model.entities.item, core.model" table="item" lazy="true">     <id name="id" column="id" type="long">         <generator class="native" />     </id>     <property name="symbol" column="symbol"/>     <many-to-one name="name" class="core.model.entities.translation, core.model" fetch="join" column="name" cascade="all" />     <many-to-one name="description" class="core.model.entities.translation, core.model"  fetch="join" column="description" cascade="all" />  </class>

it works great, when single item has multiple translations, item.dao.getall() method, returns many results there translations, if add 3 translations item.name, item.dao.getall method returns me 3 identical item objects. have checked database - fine - 1 row in "item" table, 1 row in "translation" table , 3 rows in "translation_value" table. why nhibernate returns me 3 results when there 1 entry in database!?

edit: looked on query wich nhibernate generates , looks this:

select  this_.id id23_3_,  this_.symbol symbol23_3_,  this_.name name23_3_,  this_.description descript4_23_3_,  this_.sort sort23_3_,  this_.published published23_3_,  this_.created_at created7_23_3_,  this_.updated_at updated8_23_3_,  translatio2_.id id26_0_,  translatio3_.translation_id translat3_5_,  translatio3_.id id5_,  translatio3_.language_id language4_5_,  translatio3_.id id9_1_,  translatio3_.value value9_1_,  translatio3_.translation_id translat3_9_1_,  translatio3_.language_id language4_9_1_,  translatio4_.id id26_2_ item this_   left outer join translation translatio2_ on this_.name=translatio2_.id  left outer join translation_value translatio3_ on translatio2_.id=translatio3_.translation_id  left outer join translation translatio4_ on this_.description=translatio4_.id

this query returning 3 results, 1 each translation. why nhibernate not fills many 1 translations objects instead of returning 3 rows?

it's happening because have specified fetch="join" in mapping translations collection. if don't want use lazy loading collection, should change dao.getall() method use hql or criteria api eagerly fetch collection , limit result distinct parent objects.


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