nhibernate repository pattern

I have a very basic question with nhibernate and repository pattern:

I have a repository (aggregate) and this is a parent. If I want to delete a child, should I have a single delete method that handles deletion of both the child and parent or should I have different methods?

How should I handle deleting a parent which has a child. Any sample code开发者_运维知识库 would be appreciated.

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Are you using hbm mapping files or Fluent NHibernate to set up your mappings?

If you are using mapping files, one option would be to set the cascade attribute, e.g.:

...
<bag name="Children" lazy="true" cascade="delete" >
    <key column="ParentId" />
    <one-to-many class="Child" />
</bag>
...

cascade="delete" will result in deletes of the parent being cascaded to it's associated objects. Cascade can be specified as cascade="all|none|save-update|delete" so you can specify which operations should be cascaded from the parent to the associated objects.

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Note .Cascade.All():

HasMany(item => item.ItemFeedbackItems)
            .KeyColumn("ItemID")
            .Cascade.All()
            .LazyLoad()
            .Access.ReadOnlyPropertyThroughCamelCaseField(Prefix.Underscore);