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Hibernate version:
3

Name and version of the database you are using:
Mysql

I use one-to-many relationships a lot, the docs say that is a "rare" relationship and many-to-one is a more common unidirectional relationship. To me, I never could get the queries to run properly with a many-to-one relationship (for example with a where clause).

Am I following a bad practice.

Normally, I use the following structure:
<bag
name="terms"
lazy="false"
order-by="id"
cascade="all">
<key column="category_name"/>
<one-to-many
class="org.spirit.bean.impl.BotListPostImageMetadata" />
</bag>