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Strong Parameters
The strong_parameters gem is an improvement over attr_accessible to securely handle mass assignment even when you have complex authorization logic. The functionality will likely be added to Rails 4 so it is a good idea to learn how it works.
(12 minutes)
ElasticSearch Part 2
This final part on ElasticSearch and Tire will show how to make more complex search queries, customize the indexing, and add facets.
(16 minutes)