HQL and one-to-many queries

Question

I have Hibernate domain objects that looks like this:

   class Player {
      List<Item> inventory;
   }

   class Item {
      List<Enchantment> enchantments;
   }

   class Enchantment {
      boolean isSuperiorEnchantment;
   }

I need to construct an HQL query that returns to me a list of all players that have at least one item with an enchantment on it that has the isSuperiorEnchantment flag set. I can't for the life of me figure out a way to express this in HQL.

Any ideas?

Answer 1

Assuming the appropriate mappings on all of the above, the query you're looking for is:

from Player as p
  left join p.inventory as i
  left join i.enchantments as e
  where e.isSuperiorEnchantment = 1