How to get the labels of entries in a fixture


I use in tests fixtures, you know these wonderful YAML files for
seeding the database. When you have a database table :items then there
is in the corresponding YAML file items.yml before each item its
label, so you can access the item by items(:label) in your tests.

How can I get all the labels (not the items) more elegantly than
parsing the YAML file?

Thanks in advance,